Holmes® Desktop HEPA-Type Air Purifier with Optional Ionizer Small Air Purifier (HAP242B-U) is rated 4.3 out of 5 by 86.

Holmes® Desktop HEPA-Type Air Purifier with Optional Ionizer Small Air Purifier (HAP242B-U)

Name: Holmes® Desktop HEPA-Type Air Purifier with Optional Ionizer Small Air Purifier (HAP242B-U)
Brand: Holmes
SKU: SAP_HAP242BU
Availability: InStock

Holmes® Desktop HEPA-Type Air Purifier with Optional Ionizer Small Air Purifier (HAP242B-U) is rated 4.3 out of 5 by 86.

Product Details

Description

The Holmes® Desktop Air Purifier with HEPA-type filter captures particles as small as 2 microns and operates quietly to remove up to 99% of airborne particles such as pollen, dust, mold, pet dander, and smoke, providing relief from odor and irritants in the air so you can breathe comfortably. The optional ionizer ensures particles are more easily captured and also tackles odors. The Holmes® Desktop Air Purifier can be placed vertically or horizontally and is designed to fit just about anywhere and effectively treat the air around you.

Features

REMOVES UP TO 99% OF AIRBORNE PARTICLES: The Holmes® Desktop HEPA-Type Air Purifier with Optional Ionizer captures particles as small as 2 microns from air passing through the HEPA-Type filter, removing up to 99% of airborne particles and allergens, such as pollen, dust, mold, pet dander, and smoke from the air so you can breathe more comfortably.
INCLUDES IONIZER: This Holmes® air purifier features an optional air ionizer that helps to bind negative ions to airborne smoke, dust, and pollen to form larger particles that are more easily captured, helping to clean air more thoroughly and tackling odors
70 CADR: Air purifier provides a 70 CADR (Clean Air Delivery Rate)
CUSTOMIZABLE SETTINGS: 3 speed settings to help you keep your air clean and pure
SLIM DESIGN, IDEAL FOR SMALL ROOMS: Recommended for rooms up to 109 sq. ft.; can be placed vertically or horizontally anywhere, including a table or desktop.
DURABLE: 3-year limited warranty

Specifications

Model: HAP242B-U
Dimensions: 9.7x13.0x6.3
Wattage: 45
Filter Technology: hepa-type
Color: White
Room Size: small
Power Source: 2-Prong Plug (Polarity type)

Where to Buy

The following link will take you to a site outside of Holmes Products.

Rated 5 out of 5 by va3592 from Great product for desk and great price! Hi. This is a great product that helps me with my allergies at my desk at work. I have always had allergy flare ups in my current workplace office. After getting this product, it feels like I can breath so much better and don't have as many allergy flare ups at my desk. I have it at my desk right beside me, and on any of the settings it is not too loud or bother me or my coworkers. I tend to keep it on the lowest or second lowest fan speed setting. I don't use the ionizer very often. I also like the aer1 true-hepa replacement filter. Thanks for making great products that anyone can afford!

Date published: 2016-03-01

Rated 3 out of 5 by sexykitten from Works ok I have bought two at the same time and started using mines about one 1/2 months ago and i have noticed a difference but i still need to get maybe 6 more cause i have big apt. I have dirty air ducts from my landlord not wanting to clean them . I first saw these on amazon and and bought them there and so these desktop purifier seems to help . I how ever been having runny nose these past few days so i either need to get air ducts cleaned out or keep buying these for ever room . If anyone one or company have advise on what i need to do far as my air ducts need to be clean let me know cause i do not feel i have to clean them out cause i do not own this house.

Date published: 2018-02-05

Rated 5 out of 5 by MeasurementBlues from Prevents headaches I've used an older model (white) model for several years. I keep it near the bed and it prevents me waking up with headaches. Without it, I'd have to wipe down the room every night. As someone noted below, the inside eventually got dirty. I took the unit apart to clean the inside. I even managed to get all the screws back where they belong. Four screws were hidden under the feet and a strip. I'll cut off the ends of the strip exposing the screws so next time, I can leave the strip in place and have access to the screws. It's possible that the unit got dirty inside because I may have bought an after-market filter.

Date published: 2023-06-05

Rated 1 out of 5 by Turnemic from I have the older model Bought the model before this one I believe HAP9240. I consistently cleaned the unit and changed the filter each month with the green quality AER HEPA filters. I thought it was working well until I shined a flashlight down the outlet side of the unit, (where the fresh "purified" air is coming out of) and it was filthy. Yes I have the filter in right and yes it has a good seal. I know it's a cheap purifier but I wasn't expecting that amount of dirt and particles on the fresh air side of it. I enjoy Holmes products and I'd like to see Holmes make this right and correct it.

Date published: 2019-04-03

Rated 5 out of 5 by DancinDi from Stops nearby dust and smoke pronto Positioning this small air purifier is critical. I have one over the cat litter boxes in our RV. I use non perfumed litter so dust smell is my enemy. I have asthma and allergies. This air cleaner with the ionizer on works so well that we hardly notice the litter boxes. I also add a large hepa at night during high pollen. My daughter uses hers at night near the bed. It cleans and creates white noise. She is an LPN and adores her air cleaner and her sleep. Our third 242 is near the computer in the guest room at our cottage. Great for cleaner smells and white noise. This room has carpet and tends to have an odor that I can smell. Not so with the ionizer on.

Date published: 2018-11-23

Rated 5 out of 5 by danichance from Great product. Totally limits dust. I love using this at night as white noise, SOOOOO much better than a fan!!

Date published: 2017-10-24

Rated 5 out of 5 by Jill lee from They last forever I bought this to replace one I had for 45 years. It was still working but when I saw this one on sale. Well it was a sale. I once tried another company that had a TV commercial showing how quickly it removed air pollutants. Well it blew up and caught fire in less then 30 days. From then on I will only buy Holmes products and you should too

Date published: 2018-01-21

Rated 3 out of 5 by Nells from Cleans well, but is rather loud I have had mine for some years now, and just looking at the old filters tell you it cleans well. BUT, it is so darn LOUD! I have always slept with a purifier running because I can't sleep with it too quiet. But this machine is right on that too-loud threshold. Granted, it is in a very small room, but my older machines had a more reasonable volume. Another downside is I can't figure out how to take the case apart for a good deep cleaning. Older styles were very easy. I had to borrow someone's air compressor to get all the dust blown out of it, which was making it even louder. So, if you want a machine that filters well, this one will make you happy. If you need to sleep with White Noise, this will also help, but it may be a bit too loud for you if you have it in a small room.

Date published: 2016-12-08

Holmes® Desktop HEPA-Type Air Purifier with Optional Ionizer Small Air Purifier (HAP242B-U) Reviews - page 2

<div id="bvseo-questionsSection"> <div class="bvseo-question-answer" data-questionid="3522522"> <h2 class="bvseo-question"> It seems that the air filter has the corrugated face towards the inside of the unit and darker carbon surface facing out....should it not be the other way around? You would think the corrugated area would trap most of the particles 1st before the carbon </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Petrovich</div> <div class="bvseo-answer" data-answerid="3224801"> Thank you for your question. The reason the foam pre filter and the carbon filter is in front of the HEPA filter is to protect the more important, HEPA filter. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-07-13</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3482182"> <h2 class="bvseo-question"> The power, is it possible to travel international with this? 120V or 120-240V </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Vicc</div> <div class="bvseo-answer" data-answerid="3194826"> Thank you for your question. No, our products are not designed for most international use. They are designed for use in a standard 120V AC electrical outlet. I would like to apologize for any inconvenience that this has caused you. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-06-30</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3481899"> <h2 class="bvseo-question"> Where is the filter located? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: CynBoullet</div> <div class="bvseo-answer" data-answerid="3194739"> Thank you for your question. The filter of this unit is located behind the removable front grill. Also, this unit uses any of our AER1&reg; replacement filters. You can view our full line of AER1&reg; replacement filters by simply clicking the link below.

http://www.holmesproducts.com/filters/aer1/?src=17ZS <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-06-30</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3469193"> <h2 class="bvseo-question"> Does this air purifier release any Ozone? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Sarahhh</div> <div class="bvseo-answer" data-answerid="3180634"> Thank you for your question. Our ionizer may produce an occasional popping or cracking sound. This is normal and occurs when a small buildup of ions is discharged.
After extended use, you may notice dust around the grills or front panel.
&bull; This is caused by negative ions exiting the air outlet, evidence of the ionizer&rsquo;s air cleaning effectiveness.
&bull; You can remove the dust with a soft brush or clean, damp cloth. Larger particles may be attracted to positively charged surfaces throughout the home, like walls or floors.
&bull; This may occur more frequently when the filter is nearing the end of its useful product life and unable to capture as many charged particles.
&bull; Excessive amounts of pet dander, dust, or smoke may decrease the life expectancy of the filter(s) and interfere with the ionization process.
 
To help prevent particles from attracting to surfaces throughout your home:
&bull; You may want to run the ionizer less often.
&bull; Check the condition of the filter(s) more frequently.
 
CAUTION: The ionizer in this appliance produces less ozone than the UL* established limits of 50ppb. However, in high concentrations, ozone can be harmful to birds and small pets. To prevent ozone buildup, we suggest using the ionizer in well ventilated areas with the fan on. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2018-06-30</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3431566"> <h2 class="bvseo-question"> filter type for holmes hap 240 please </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: ullrich</div> <div class="bvseo-answer" data-answerid="3175355"> Thank you for your inquiry. The HAP240 air purifier will use any HAPF30 filter or any aer1&reg; filter. Please follow the link below. 

http://www.holmesproducts.com/filters/aer1/?src=17ZS <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-06-23</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3461768"> <h2 class="bvseo-question"> How can I tell when the HAPF30AT air filter used with this model needs to be replaced? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: demetrios</div> <div class="bvseo-answer" data-answerid="3173897"> Thank you for your question. This particular model is not equipped with any type of filter change indicator. We recommend changing HEPA-Type filters every 6 to 8 months. You can also simply look at the filter and use your best judgement as to its condition. The filter will be very discolored and possibly even black when it is needed to be changed. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2018-06-30</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3461758"> <h2 class="bvseo-question"> How can I tell when the HAPF30AT needs replacement on this model. It is not obvious or is it? Be specific please. </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: demetrios</div> <div class="bvseo-answer" data-answerid="3173889"> Thank you for your question. This particular model is not equipped with any type of filter change indicator. We recommend that you change the HAPF30AT filter every 6-8 months. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-06-22</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3440371"> <h2 class="bvseo-question"> where does the hapf60 carbonpre filter go? does it take the place of the foam dust catcher? I have the hap 242 desk top purifier </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: timbo</div> <div class="bvseo-answer" data-answerid="3155456"> Thank you for your question. The HAPF60 carbon filter is not compatible with your unit. You will have to call us at 800-546-5637 and order the BHOR31 carbon insert. The insert slides in the front of your AER1 HEPA filter. The carbon filter does not take the place of the foam prefilter. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-06-14</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3402364"> <h2 class="bvseo-question"> I recently was given the desktop purifier..our house has really poor air quality so we HAVE to clean the air. WHAT DOES THE SWITCH W THE ORANGE LIGHT DO DIFFERENTLY?? I believe it's called an ionizer..?? I just want to kno what's different .. </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Nikky83</div> <div class="bvseo-answer" data-answerid="3128815"> Thank you for your inquiry. The button is the ionizer. The ionizer releases negative ions into outgoing filtered air. Ions are tiny particles that carry a positive or negative charge. These ions exist naturally around us, in the air, water and ground. Both positive and negative ions are colorless, odorless and completely harmless. Negative ions help the air purification process by attaching themselves to very small airborne particles in the room. Please follow the link below for the instruction booklet. 

http://www.holmesproducts.com/on/demandware.static/-/Sites-holmes-products-Library/default/dw5ed9b0db/documents/instruction-manuals/HAP242_16EM1%20HEPA-Type%20Desktop%20Air%20Purifier.pdf <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2018-06-30</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3314033"> <h2 class="bvseo-question"> I have 2 new filters, rlh30 from my old air purifier/ionizer. Will they fit this unit? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Dave675</div> <div class="bvseo-answer" data-answerid="3056367"> Thank you for contacting us. No, the old filters are not compatible with this model. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-05-01</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3271608"> <h2 class="bvseo-question"> I have 220 V AC&nbsp;
Does it work or i have to change the current to 110 V&nbsp; </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Salm</div> <div class="bvseo-answer" data-answerid="3024762"> Thank you for your inquiry. This air purifier is not designed for use anywhere outside of the US or Canada. All of our products that are sold in the United States and Canada are manufactured and UL approved for 110-120 voltage. We would not recommend using a converter as the product may be damaged. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-04-17</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3264952"> <h2 class="bvseo-question"> What would be the replacement filter for this machine/model? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: JillBSalisbury</div> <div class="bvseo-answer" data-answerid="3021069"> Thank you for your question and we are more than happy to help. You can actually use any of our aer1&reg; filters with your unit as they will all be compatible. Any of our HAPF30 or HAPF300 filters will be compatible with your model. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-05-20</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3258149"> <h2 class="bvseo-question"> How often do you suggest changing the filter? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: pwdarden</div> <div class="bvseo-answer" data-answerid="3011707"> Thank you for your inquiry. We recommend changing the filter every 12 to 18 months. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-04-10</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3213720"> <h2 class="bvseo-question"> Does unit kill mold? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: flat head</div> <div class="bvseo-answer" data-answerid="2976009"> Thank you for your inquiry. Yes, the air purifier will help to filter mold spores. An air purifier filters dust, smoke, pollen, pet dander, mold spores, and other airborne particulate as small as 0.3 microns. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-06-06</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3212277"> <h2 class="bvseo-question"> Is this available by phone to call you to order? &nbsp;Is it available around Dubuque, Iowa? &nbsp; It is not an ionizer is it? I would just have to change filter sometimes , right?
It is okay or a closed off room at night?

Thank YOu &nbsp;Harriet &nbsp;&nbsp; </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Harri</div> <div class="bvseo-answer" data-answerid="2975938"> Thank you for your inquiry. Yes, this air purifier is available to order from us by phone at 1-800-323-9519; we are available Monday through Saturday from 8 AM to 8 PM, EST. Unfortunately, the part is not available online. You may be able to find it locally at stores like Walmart, Target, and Best Buy. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-03-24</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3170872"> <h2 class="bvseo-question"> what carbon filter does this use </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: mona123</div> <div class="bvseo-answer" data-answerid="2935266"> Thank you for your question. Any of the AER1&reg; True HEPA filters will work in this air purifier. We have included a link to the filters below.

http://www.holmesproducts.com/filters/aer1/ <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-03-06</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3159213"> <h2 class="bvseo-question"> Is there someone that might be able to tell me exactly which filter fits our HAP240 Purifier? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Nana Cricket</div> <div class="bvseo-answer" data-answerid="2927363"> Thank you for your question. This unit will use any of our HAPF30 filters or HAPF300 filters. All of these will be compatible with your model. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-03-02</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3154950"> <h2 class="bvseo-question"> Is it compatible with an inverter for use in a car. I have a 100 W 12V to 110 AC inverter. I am sure it outputs a triangle vs sine wave. If not you should make a 12V unit of similar size for car use. </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: johngardner58</div> <div class="bvseo-answer" data-answerid="2923190"> Thank you for your inquiry. No, this air purifier cannot be used with an invertor in a car. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-02-28</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3146408"> <h2 class="bvseo-question"> What is the energy consumption on the HAP9243 ? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: laurah</div> <div class="bvseo-answer" data-answerid="2919865"> Thank you for your inquiry. We recommend contacting your electricity company to obtain the power consumption of this air purifier because each company charges a different rate and there is no way we can provide this information. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-05-20</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3101137"> <h2 class="bvseo-question"> Does this machine require a carbon filter to use? My product came with one and it seems to be working fine, but I was curious if there's a way to replace these carbon filters for the HAP 242 or would just using an Aer1 filter alone be sufficient? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Ben Heimer</div> <div class="bvseo-answer" data-answerid="2884936"> Thank you for your inquiry. A carbon filter is not always necessary. The HAPF30AOCS and the HAPF30AS-U4R filters have built in Carbon Filters.

http://www.holmesproducts.com/filters/aer1/aer1-hapf30ao-odor-eliminator-replacement-filter/HAPF30AOCS.html#q=aer1&amp;sz=33&amp;start=27

http://www.holmesproducts.com/filters/aer1/aer1-hapf30as-smoke-grabber-replacement-filter/HAPF30AS-U4R.html#q=aer1&amp;sz=33&amp;start=30 <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-02-08</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3100563"> <h2 class="bvseo-question"> What is the power consumption of Holmes - Holmes&reg; Desktop Air Purifier with HEPA-Type Filter &amp; Optional Ionizer? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Eileen</div> <div class="bvseo-answer" data-answerid="2882956"> Thank you for contacting us. We do not have the ability to say what the power consumption of this air purifier is as it varies per individual power company and the area of the country in which you live. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-04-06</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3081778"> <h2 class="bvseo-question"> what Hepa filter does this unit use? I cant seem to find it on this site. The filter in my unit is HAPF30 HEPA-Type Filter A. </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Vicki R</div> <div class="bvseo-answer" data-answerid="2871018"> This unit will only use the Hapf30 or the HAPF300 filter's. This means any of the aer1&reg; filters will work with your model. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-02-01</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3050656"> <h2 class="bvseo-question"> And what stores sell your products sunce this model is not available online?&nbsp; </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Weldon</div> <div class="bvseo-answer" data-answerid="2850395"> You will find Holmes&reg; products in all the stores listed below. 

Target
Lowe's
BestBuy
The Home Depot
JCPenney
Walmart
Kohl's
Sam's Club <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-01-23</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3050642"> <h2 class="bvseo-question"> I have an air purifier/ionizer and I'm trying to find filters for it I have a slightly older version of the one shown here!?&nbsp; </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Weldon</div> <div class="bvseo-answer" data-answerid="2850327"> We want to ensure that you are enjoying the full benefits of the unit and we are happy to help you with it. For assistance, please call us at 1-800-546-5637; we are available Monday through Saturday from 8 AM to 8 PM, EST. For faster response time, please feel free to live chat with us at the above link from 8:00am to 8:00pm, EST, Monday thru Saturday. You will need to click the Live Chat button.



https://www.holmesproducts.com/contactus?cid=contact-us <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-01-23</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3045700"> <h2 class="bvseo-question"> are filters for hap240 available from you? anyplace locally? how much? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: neilcf</div> <div class="bvseo-answer" data-answerid="2846914"> Thank you for contacting us. Yes, any of the AER1&reg; filters will work with this air purifier. Below you will find a link to these filters on our website. 

http://www.holmesproducts.com/filters/aer1/ <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-01-21</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3031122"> <h2 class="bvseo-question"> what is the ionizer and when should I use it </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: adnaz56</div> <div class="bvseo-answer" data-answerid="2842695"> Some Air Purifiers have an independently controlled ionizer, which, when turned on, releases negative ions into outgoing filtered air. Ions are tiny particles that carry a positive or negative charge. These ions exist naturally around us, in the air, water and ground. Both positive and negative ions are colorless, odorless and completely harmless. Negative ions help the air purification process by attaching themselves to very small airborne particles in the room. 

These particles take on a negative charge and may join with positively charged particles such as dust, pollen, smoke and pet dander to form larger particles that are then more readily captured by the filter system, or may be attracted to positively charged surfaces throughout the home, like walls or floors. This may occur more frequently when the filter is nearing the end of its functional life expectancy and is able to capture less of the charged particles. 

You may also note after extended use, that dust may have collected around the grills or front panel. This is from the ionization affect caused by the negative ions exiting from the air outlet. This is additional evidence of the air cleaning effectiveness of negative ions. The dust can be easily removed with a clean, damp cloth or soft brush. 

Finally, using your ionizer may result in an occasional popping or cracking sound. This is a normal sound, generally caused by particles of dust that are interrupting the flow of ions, causing a small build-up of ions that, when discharged, cause the popping or cracking sound. 

Using the ionizer in conjunction with dirty filters may result in dirty particles exiting the air purifier and being attracted to walls, carpets, furniture or other household objects. These dirty particles may prove very difficult to remove. Homes with excessive amounts of pet dander, dust, or smoke may decrease the life expectancy of the HEPA filtration system. You may want to run the Ionizer less often and check the condition of the HEPA filter(s) more frequently. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-01-19</div> </div> </div> <div class="bvseo-question-answer" data-questionid="3007347"> <h2 class="bvseo-question"> What filter does it take and how much does it cost? </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: bobeeo</div> <div class="bvseo-answer" data-answerid="2826307"> Thank you for your question. Your HAP242 air purifier takes the HAPF300AHCS filter which is priced at $19.99 per filter. This filter can be purchased directly through our website. Below you will find a link to the filter on our website. 

http://www.holmesproducts.com/filters/air-purifier-filters/aer1-hapf300ah-true-hepa-allergen-remover-replacement-filter/HAPF300AHCS.html <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-01-12</div> </div> </div> <div class="bvseo-question-answer" data-questionid="2999631"> <h2 class="bvseo-question"> Just purchased this purifier...when on medium and low there is a rattling noise- solution please. &nbsp;When the unit is on hight, no rattle detected. &nbsp;Thx! </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Ash1976</div> <div class="bvseo-answer" data-answerid="2823175"> We want to ensure that you are enjoying the full benefits of the unit and we are happy to help you with it. For assistance, please call us at 1-800-546-5637; we are available Monday through Saturday from 8 AM to 8 PM, EST. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-01-11</div> </div> </div> <div class="bvseo-question-answer" data-questionid="2982882"> <h2 class="bvseo-question"> I want to use this for purifying the air in my car. What kind of plug does it have? A USB or plug for car lighter would be awesome </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Aubra</div> <div class="bvseo-answer" data-answerid="2799390"> Thank you for your question. All of our products are made for 120V/AC electricity only. We do not advise using these in a car. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2016-12-30</div> </div> </div> <div class="bvseo-question-answer" data-questionid="2908101"> <h2 class="bvseo-question"> Hi,
I purchased this product and tried to use it in my office in Portugal but it doesn't seem to work. Is this device not compatible with 220 V? Only the ionizer light turns on. Thanks </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: bb2630</div> <div class="bvseo-answer" data-answerid="2753192"> This product is not designed for use in Portugal, or anywhere outside of the US or Canada. All of our products that are sold in the United States and Canada are manufactured and UL approved for 120 voltage only. Although it may be possible to use a voltage converter with one of our products, we do not recommend using them. We do not have any information on specific voltage converters so we cannot recommend that one be used. <div class="bvseo-author">Answered by: HolmesSupport</div> <div class="bvseo-pubdate">Date published: 2017-02-14</div> </div> </div> </div> <script type="text/javascript"> if (document.getElementById('bvseo-questionsSection')) { document.getElementById('bvseo-questionsSection').style.display = 'none'; } </script>   <ul id="bvseo-paginationSection"> <li class="bvseo-paginationItem"><a class="bvseo-paginationLink" href="https://www.holmesproducts.com/air-purifiers/desktop/holmes-desktop-hepa-type-air-purifier-with-optional-ionizer-small-air-purifier-hap242b-u/SAP_HAP242BU.html?actionPoint=Show&bvroute=Reviews%2FshowHelpfulCritical&bvrrp=Main_Site-en_US/questions/product/6/SP_397575.htm">Holmes® Desktop HEPA-Type Air Purifier with Optional Ionizer Small Air Purifier (HAP242B-U) Questions - page 6</a></li> </ul>  <ul id="BVSEO_meta" style="display:none!important"> <li data-bvseo="bvDateModified">y_2024, m_12, d_7, h_7CST</li> <li data-bvseo="ps">bvseo_bulk, prod_bvqa, vn_bulk_3.0.42</li> <li data-bvseo="cp">cp_5, bvpage2n</li> <li data-bvseo="co">co_hasquestionsanswers, tq_178</li> <li data-bvseo="cf">loc_en_US, sid_SP_397575, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]</li> <li data-bvseo="diagnostics">clientName_holmes</li> </ul>  <ul id="BVSEOSDK_meta" style="display: none !important;"> <li data-bvseo="sdk">bvseo_sdk, dw_cartridge, 18.2.0, p_sdk_3.2.0</li> <li data-bvseo="sp_mt">CLOUD, getContent, 0ms</li> <li data-bvseo="ct_st">questions, product</li> </ul>