Medify MA-40 Review: 245 cfm Certified, Filters Every Four Months
Medify MA-40 review: 245 cfm AHAM smoke CADR for 380 sq ft (v4.0), H13 filters every 3,000 hours at $59.99, 68 W, a lifetime warranty with registration.
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Specs at a glance
- AHAM smoke / dust / pollen CADR (v4.0)
- 245 / 257 / 263 cfm (PM2.5 250 cfm)
- AHAM suggested room size (v4.0)
- 380 sq ft
- AHAM annual energy (v4.0)
- 261 kWh, integrated energy factor 5.6
- Filter
- H13 True HEPA set (H14 option), every 3,000 hours or about 4 months (Medify)
- Replacement filter
- $59.99 (Medify store)
- Noise
- About 40.5 to 53.3 dBA (Medify)
- Power
- 68 W (Medify)
- Size
- 22 x 9.9 x 10.9 in (Medify)
- Warranty
- Lifetime with registration (Medify)
- CARB
- MA-40-V4.0 and V3.0 listed as mechanical air cleaners
The Medify MA-40 is an AHAM-listed purifier for living rooms and large bedrooms: the current v4.0 is rated at 245 cfm of smoke CADR for a 380 square foot room, in line with the Winix 5510 and Levoit Vital 200S-P. Medify adds a lifetime warranty if you register the unit and an H13 HEPA filter.
Two things count against it. Medify says to replace the filter every 3,000 hours, about four months of continuous use, so at $59.99 a filter the yearly cost runs to about $180 for a unit running around the clock. And its lowest speed is about 40 dBA by Medify's figures, noticeably louder than the 23 to 24 dB low settings Levoit and Winix quote.
Medify MA-40 AHAM figures: which version you get
The AHAM Verifide directory lists three MA-40 generations:
| Version | Smoke / dust / pollen CADR | Room size |
|---|---|---|
| MA-40 v4.0 | 245 / 257 / 263 cfm | 380 sq ft |
| MA-40 V3.0 | 241 / 287 / 332 cfm | 374 sq ft |
| MA-40 (original) | 239 / 231 / 240 cfm | 370 sq ft |
The smoke figure, the one that matters most, barely changes between versions, so any MA-40 you buy new performs about the same on fine particles. Medify also quotes its CADR as 406 cubic meters an hour, which is 239 cfm. California's Air Resources Board lists the MA-40-V4.0 and MA-40-V3.0 as mechanical air cleaners; the MA-40UV variant, which adds a UV lamp, is listed as electronic.
| Room | Floor area | Air changes an hour |
|---|---|---|
| Main bedroom, 14 x 17 ft | 238 sq ft | 7.7 |
| Living room, 16 x 20 ft | 320 sq ft | 5.7 |
| AHAM room size | 380 sq ft | 4.8 |
| Open plan, 20 x 25 ft | 500 sq ft | 3.7 |
The filter interval is the real cost
Medify says its filters should be replaced after 3,000 hours, about four months of continuous use; other Medify pages say four to five months. The MA-40 filter set is $59.99 on Medify's store, with a subscription that ships every 120 days. Running around the clock, that is three filters a year.
| Use | Filters, 3 years | Electricity, 3 years | Running cost |
|---|---|---|---|
| 24 hours a day (3 filters a year) | $540 | $135 | about $675 |
| 12 hours a day (about 1.5 filters a year) | $270 | $135 | about $405 |
Compare that with the Coway AP-1512HH's $59.79 yearly set or the Winix 5510's 12-month filter: the MA-40 costs more to keep running than it does to buy within about a year and a half of round-the-clock use.
Noise, power and controls
Medify lists about 40.5 dBA on its lowest speed and sleep mode, 50.3 dBA on speed 2 and 53.3 dBA on the highest. That low end is the weak spot for bedrooms: it is a steady fan sound, not a near-silent one. Medify rates it at 68 W, and AHAM puts the v4.0's annual energy at 261 kWh with an integrated energy factor of 5.6. It has three fan speeds, a timer up to 8 hours, a child lock and a filter indicator.
The lifetime warranty
Medify advertises a lifetime warranty on its purifiers as long as you register the product and follow the manual. Unlike Alen's Forever Guarantee, the terms Medify describes do not require a filter subscription. Read the current terms on Medify's site before you rely on it.
Medify MA-40 vs the alternatives
| Model | Smoke CADR | Room size | Filter interval |
|---|---|---|---|
| Medify MA-40 v4.0 | 245 cfm | 380 sq ft | About 4 months |
| Winix 5510 | 253 cfm | 392 sq ft | About 12 months |
| Levoit Vital 200S-P | 250 cfm | 388 sq ft | Tracked by run time |
| Levoit Core 400S-P | 234 cfm | 363 sq ft | Tracked by run time |
Who should buy the Medify MA-40
- Buy it for a living room, classroom or office up to about 380 sq ft where a certified CADR and a lifetime warranty matter more than running cost.
- Buy it if it runs part of the day, which stretches the filter toward a year and a half per three filters.
- Skip it for a bedroom where silence matters; its low speed is about 40 dBA.
- Skip it for 24/7 use on a budget; three filters a year add up.
See our best air purifiers for alternatives at this size.
Frequently asked questions
What size room does the Medify MA-40 cover?
AHAM Verifide lists the v4.0 for 380 sq ft, with a smoke CADR of 245 cfm. Medify's figure of about 900 sq ft in 30 minutes is two air changes an hour.
How often do you change the Medify MA-40 filter?
Medify says after 3,000 hours, about four months of continuous use; some Medify pages say four to five months. The filter set is $59.99 on Medify's store.
Is the Medify MA-40 AHAM certified?
Yes. AHAM's directory lists the original, V3.0 and v4.0 versions, with smoke CADRs from 239 to 245 cfm.
How loud is the Medify MA-40?
Medify lists about 40.5 dBA on its lowest speed and sleep mode, 50.3 dBA on speed 2 and 53.3 dBA on high.
What warranty does Medify offer?
Medify advertises a lifetime warranty if you register the purifier and follow the manual. Check the current terms on Medify's site.
Does the Medify MA-40 produce ozone?
The standard MA-40 is a fan and HEPA filter, and California lists the V3.0 and v4.0 as mechanical air cleaners. The MA-40UV, with a UV lamp, is listed separately as electronic.
Sources
- AHAM Verifide Directory: Certified Room Air Cleaners (Medify MA-40), Association of Home Appliance Manufacturers
- MA-40 Air Purifier for Home, School & Offices, Medify Air
- MA-40 Air Purifier Replacement Filters, Medify Air
- List of CARB-Certified Air Cleaning Devices, California Air Resources Board
- Electric Power Monthly, Table 5.3, US Energy Information Administration
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