Medify MA-40 Review
We do not test air purifiers. What we do is read the certified record for one, in full, and say where it is strong, where it is mid-pack, and where the marketing outruns it.
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A solid, honest mid-size machine. ENERGY STAR certifies 245 CFM across 380 square feet with 0.00 ppb measured ozone and no ion stage. It is mid-pack on efficiency and its “medical grade” marketing is not a classification — the register records HEPA-Type.
Before anything else: we have not tested this unit. We own no air purifiers, we run no laboratory, and we make no first-party performance claim anywhere on this site. What follows is the certified record read carefully, plus the places where it stops answering — our method in full, including where it runs out.
The certified record
| Specification | Figure | Source |
|---|---|---|
| Smoke CADR | 245 CFM | ENERGY STAR |
| Dust CADR | 257 CFM | ENERGY STAR |
| Pollen CADR | 263 CFM | ENERGY STAR |
| PM2.5 CADR | 250 CFM | ENERGY STAR |
| Certified room size | 380 sq ft | ENERGY STAR, at 4.8 ACH |
| Advertised coverage | 1,793 sq ft | Medify |
| Annual energy use | 261 kWh | ENERGY STAR |
| Electricity per year | $48 | Our arithmetic at a named rate |
| Air per watt | 5.6 CFM/W | ENERGY STAR |
| Measured ozone | 0.00 ppb | ENERGY STAR |
| Ionizer | None — fan and filter | ENERGY STAR |
| Filter classification | HEPA-Type | ENERGY STAR |
| AHAM directory | Not listed | AHAM VERIFIDE |
| Noise | Not published in our sources | — |
| Filter interval and price | Not published in our sources | — |
Electricity costs on this page use 18.34¢ per kWh, the U.S. average residential price for June 2026 from the U.S. Energy Information Administration, Electric Power Monthly, Table 5.3. Your rate is on your bill and is probably not this one; multiply the kWh figure by your own rate and you have your number.
What is genuinely good about it
It is in a register. That sounds like faint praise until you notice that the single most-recommended machine in this category — the Coway AP-1512HH — is in neither, and that Dyson is in neither. The MA-40 filed, was tested to ANSI/AHAM AC-1 through an EPA-recognized body, and its numbers are public.
Zero measured ozone, and nothing bolted on. No ion generator, no plasma stage, no UV lamp. EPA advises avoiding portable air cleaners that intentionally produce ozone because ozone is a lung irritant, and this machine gives you nothing to switch off and nothing to worry about. Among mid-size units that is less common than it should be.
The coverage is real at 380 square feet. Under AHAM’s two-thirds rule a 380 square-foot room asks for 254 CFM and this delivers 245. It clears its own certified room comfortably rather than exactly.
What is mid-pack, and what is oversold
Efficiency. 5.6 CFM per watt is unremarkable. The Honeywell HPA6000 posts 7.3 while certifying a slightly larger room, which works out at $38 a year against the MA-40’s $48. Over a machine that runs continuously for years that gap is the single strongest argument against this unit.
“Medical grade”. There is no such classification for a consumer air purifier. The register records the filter as HEPA-Type, which is the same thing it records for the LEVOIT Core range and the Blueair Max range. That is not a scandal — HEPA-Type media is perfectly capable, and filter grade is a weak differentiator between decent machines anyway — but the phrase implies a standard that does not exist.
The coverage claim. 1,793 advertised against 380 certified is a ratio of about 4.7, which is the industry norm rather than a Medify failing. It is still the number that causes people to buy one machine for a house.
Who should buy it, and who should not
Buy it if your room is between about 300 and 380 square feet, you want a certified machine with a measured zero on ozone and no features to configure, and the running-cost difference against a Honeywell does not bother you.
Do not buy it if electricity cost over years is a real consideration, if you need a published noise figure because it is going next to a bed, or if your room is materially larger than 380 square feet — at which point you are looking at the Core 600S or the Blueair 211i Max instead.
Quick picks
The MA-40 against the two machines a buyer at this size should weigh it against.
| # | Product | Best for | Certified CADR | Price |
|---|---|---|---|---|
| 1 |  The unit reviewed Medify Air MA-40 245 certified CFM across 380 sq ft, 0.00 ppb ozone, no ion stage. | Straightforward mid-size coverage | 245CFM smoke ENERGY STAR verified | |
| 2 |  Better per watt Honeywell HPA6000 257 certified CFM at 7.3 CFM/W and recorded HEPA, not HEPA-Type. | Large living rooms, true HEPA | 257CFM smoke AHAM VERIFIDE | |
| 3 |  Quieter on paper LEVOIT Core 400S 231 certified CFM with a published 22-52 dB noise range. | Popular pick, mid-size rooms | 231CFM smoke ENERGY STAR verified |
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The alternatives worth weighing
Honeywell HPA6000
Honeywell · model HPA6000B
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More certified air movement than the HPA4300 for four more watts, and the same zero on ozone. The sensible step up if your room is nearer 400 square feet.
257 smoke / 262 dust / 285 pollen CFM · 259 PM2.5
- Certified room size
- 398 sq ft
- Energy / year
- 207 kWh
- Electricity / year
- $38
- Air per watt
- 7.3 CFM/W
- Power draw
- 34.9 W
- Noise
- Not published
- Measured ozone
- 0 ppb
- Filter class
- HEPA
- AHAM rule, 350 sq ft
- Clears it (234 needed)
257 certified smoke CADR against the Medify’s 245, across a larger certified room, at 7.3 CFM per watt against 5.6 — and the register records its filter HEPA rather than HEPA-Type. Same 0.00 ppb measured ozone, same absence of an ion stage, and $38 a year against $48.
The honest con: Honeywell publishes no noise figure either, so it does not solve that gap, and it has no app or sensor features at all.
LEVOIT Core 400S
LEVOIT · model Core 400S (LAP-C401S)
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The best-selling unit in the category, and a clean example of the coverage gap: ENERGY STAR certifies it for 358 square feet while the box advertises 1,718.
231 smoke / 240 dust / 259 pollen CFM · 236 PM2.5
- Certified room size
- 358 sq ft
- Advertised coverage
- 1,718 sq ft at 1 air change per hour
- Energy / year
- 237 kWh
- Electricity / year
- $43
- Air per watt
- 5.8 CFM/W
- Power draw
- 38 W
- Noise
- 22-52 dB
- Measured ozone
- 0 ppb
- Filter class
- HEPA-Type
- AHAM rule, 300 sq ft
- Clears it (200 needed)
No ionizer — filtration only
ENERGY STAR classifies this unit 'Fan and Filter' and measures 0.00 ppb ozone. LEVOIT markets it as ozone free.
Slightly less certified air — 231 CFM across 358 certified square feet — but the same 0.00 ppb measured ozone, no ion stage, a published 22-52 dB noise range, and $43 a year.
The honest con: also HEPA-Type on the register, and absent from AHAM’s directory, so it rests on one register rather than two — the same position as the Medify.
Common questions
Is the Medify MA-40 worth it?
Is the Medify MA-40 really medical grade?
What size room is the Medify MA-40 good for?
Does the Medify MA-40 produce ozone?
Sources
- ENERGY STAR certified room air cleaners database
- AHAM — air filtration standards and the two-thirds rule
- EPA — Guide to Air Cleaners in the Home
Figures were read on the dates shown against each source. If one has changed, or if we have got something wrong, tell us and we will correct the page.
Read next
- AllergiesThe Best Air Purifiers for AllergiesThe flagship roundup: certified CADR, measured ozone, computed running cost, and the coverage claims checked against the registers.
- CADR & costTrue HEPA vs HEPA-TypeWhy 'True HEPA' certifies nothing, and which units the registers actually classify as HEPA.
- CADR & costHow to Choose an Air PurifierThe whole selection method as a walkthrough: room first, certified CADR second, register third, ozone fourth, running cost last.