Products · Air purifiers · Medify Air
Medify MA-40 Air Purifier
Reader ratings
A True HEPA (H13) purifier with a lab report on its filter, an AHAM-listed room rating and a CARB mechanical listing for its V3.0 and V4.0 versions. Medify’s page does not say which version it sells.
Best for A living room or bedroom up to about 370 sq ft, if you want a True HEPA filter with a test report behind it at a mid-range price.
- Our quality rating
- Fair (3 of 5)
- Verified marks
- CARB-listed mechanical air cleaner (V3.0 and V4.0), AHAM Verifide CADR listing
- Size
- Rooms up to about 370 sq ft (AHAM lists 370 sq ft for the MA-40, 374 for V3.0 and 380 for v4.0)
approx. $250 to $270
See it on Medify Air’s site →We are not affiliated with Medify Air. This link goes to the maker’s own page, with no tracking code. How we're funded.
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Your review
Reviews are personal experiences, not research, and they never change our quality ratings. Every review is read by our team before it appears.
How we evaluated it
Why we chose it What put it on our list
- The filter is sold as True HEPA H13, and an Intertek lab report we could open (14 March 2025, covering the MA-40) measured 99.979% mean efficiency on 0.1 to 0.3 µm particles.
- CARB’s certified list includes the MA-40 V3.0 and V4.0 as mechanical cleaners. By CARB’s definition that means filtration only, with no ozone or ions.
- AHAM’s directory lists the MA-40 at a smoke CADR of 239 (dust 231, pollen 240) for a 370 sq ft room. Its V3.0 and v4.0 entries read 241 and 245.
- A carbon layer comes with the HEPA filter, so it can also take on some odors and gases. The maker does not say how much carbon.
- The filter price and schedule are published before you buy: about $60 a filter, rated for 3,000 hours of use.
Trade-offs What to weigh before you buy
- It is not the quietest: the maker lists 40.5 dBA on the lowest speed and 53.3 dBA at full speed.
- Filters cost about $60 each, and at the maker’s 3,000-hour rating a purifier running all day needs a new one every 4 to 5 months.
- Check which version you are buying. CARB lists the V3.0 and V4.0 as mechanical but the original MA-40 (2021) and the MA-40UV as electronic. Medify’s page does not name a version: its CADR figures match the original’s AHAM entry, and it lists a UV light among its controls. If you want no UV stage, ask Medify to confirm.
- The Intertek report tests a sheet of filter material, not an assembled purifier. Room size is covered by AHAM’s directory, but we found no independent ozone report on Medify’s pages beyond the CARB listing.
What to know Details worth knowing first
The MA-40 is a mid-sized, filter-only room purifier: a pre-filter, a True HEPA H13 filter and a carbon layer, pushed by a three-speed fan. That is the design our air purifier guide points to. A HEPA filter is what lowers fine particles indoors, and a purifier that only filters has nothing to add to your air.
What sets it apart from similar units is paperwork. Medify publishes a lab report on its H13 filter material instead of only quoting a percentage, AHAM’s directory lists its room-size rating (370 square feet for the MA-40, against Medify’s 373), and CARB’s own list, which anyone can search, carries the V3.0 and V4.0 versions as mechanical. The catch is the version: CARB lists the original MA-40 as electronic, and Medify’s page does not say which one it sells, so ask before you buy.
A particle filter does not remove everything: see indoor pollutants for what it will and will not catch, and change the filter on schedule, because the carbon layer fills up.
Quality & testing How it measures up against our checklist
- Tested by
- Intertek (filter material only); AHAM Verifide (CADR); CARB (listing)
| What we checked | What we found |
|---|---|
| True HEPA (H13) Verified | Medify states “TRUE HEPA H13”. Intertek report 250305122GZU-001 (14 March 2025) lists the MA-40 among the filters tested and measured 99.979% mean efficiency on 0.1 to 0.3 µm particles (BS EN 1822-1 and ISO 29463-3, flat-sheet filter media). The report is hosted by Medify. |
| No ozone (CARB listing) Not verified | CARB’s list includes Medify Air MA-40-V3.0 (notified 2023-10-03) and MA-40-V4.0 (notified 2025-09-10) as type Mechanical. It lists the original MA-40 (notified 2021-10-15) as type Electronic, and Medify’s page does not say which version it sells. The page makes no ozone claim of its own. |
| No UV or ionizer stage Not verified | The product page’s control list includes “UV Light” without explaining it. CARB lists a separate MA-40UV, and the original MA-40, as Electronic. We could not tell which version the page describes. |
| Right size (CADR) Verified | AHAM’s directory lists three MA-40 entries: MA-40 (370 sq ft; smoke 239, dust 231, pollen 240), V3.0 (374 sq ft; smoke 241) and v4.0 (380 sq ft; smoke 245). Medify’s page quotes 239, 231 and 240 and “AHAM Verifide at 373 square feet”, which match the first entry. |
| Carbon for gases Maker’s claim | An “active carbon composite” layer is listed. The amount of carbon is not stated. |
| Running cost and noise Maker’s claim | Filter about $60 ($35.99 on subscription), rated 3,000 hours. 40.5 to 53.3 dBA. |
What the labels mean
- Verified We opened an independent record that confirms it: a certifier’s listing, a regulator’s list or a lab report. It is linked under Sources.
- Maker’s claim The maker says so on its own page or label. We read it but found no independent record.
- Not verified We looked and could not confirm it, or the maker does not say. Treat it as unknown.
Sources Where our facts come from
- Medify MA-40 product page: price, filter, CADR and noise. Maker’s page. Open ↗
- Intertek test report 250305122GZU-001: H13 filter material, 14 March 2025. Test report. Published by Medify. Covers filter material, not the assembled unit. Open ↗
- CARB list of certified air cleaning devices (search for Medify). Certifier or regulator listing. MA-40-V3.0 and MA-40-V4.0 are type Mechanical. The original MA-40 (two entries, 2019 and 2021) and the MA-40UV are type Electronic. Open ↗
- AHAM Verifide directory (search for MA-40). Certifier or regulator listing. A search tool with no link for a single listing. Searching MA-40 shows three entries: MA-40 (370 sq ft, smoke CADR 239), V3.0 (374 sq ft, 241) and v4.0 (380 sq ft, 245). Open ↗
- Medify test reports page. Maker’s page. Open ↗
Alternatives Other options to compare
- Levoit Eleva 300X Cheaper (about $130) and quieter (20 to 50 dB, per Levoit), but smaller: AHAM lists its smoke CADR at 161, against 239 to 245 for the MA-40. CARB lists it as mechanical. Its 99.97% HEPA figure rests on an unnamed lab, and its maker is settling a lawsuit over HEPA wording on older Levoit models.
- IQAir HealthPro Plus XE About $1,200, with a longer filter life (48 months for the HyperHEPA filter, on the maker’s 10-hours-a-day average). CARB lists it as mechanical. It has no AHAM entry, and IQAir cites independent labs without naming them.