AHAM Verifide at 110 cfm smoke for 170 sq ft, with a published noise figure for every single fan speed — and a room size Medify gets wrong by two square feet in its own favour.
Pros
Cons
Verdict
The MA-25 is a small machine that documents itself unusually well. AHAM measures it at 110 cfm smoke across 170 sq ft, Medify publishes the same CADR set, and — almost uniquely here — it gives a noise figure for each of its three speeds and a full coverage ladder from one air change to five. CARB lists it Mechanical, which in Medify's range is a real distinction rather than a house default: most of its siblings are classified Electronic. Two things to weigh. The filter runs 2,500 hours, three to four months, which makes the consumable the dominant running cost. And Medify's page attributes "AHAM Verifide at 172 square feet" to a directory that says 170 — harmless in a room, but the sort of slip that tells you to check the other numbers yourself.
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Who it's for
Who should skip it
How this coverage figure is stated
4.8 air changes per hour. AHAM's directory prints 170 sq ft, and AHAM's own rule gives 110 x 1.55 = 170.5. Medify publishes a full ladder rather than a single number — "825 square feet (1 ACH)", "413 (2 ACH)", "206 (4 ACH)", "165 (5 ACH)" — which is the most transparent way to quote coverage and something most of this catalogue's brands do not do. One caveat: where Medify cites AHAM directly it says "AHAM Verifide at 172 square feet every 12.5 mins (4.8 ACH)". AHAM's own directory says 170. The two-foot gap is trivial in practice; what matters is that the figure being attributed to a certifier is not the certifier's figure.
Always compare two purifiers at the same air-change rate; manufacturers pick different ones and the headline square footage is not otherwise comparable.
| Smoke CADR | 110 cfm, AHAM Verifide and Medify publishes the same 110 |
|---|---|
| AHAM suggested room size | 170 sq ft at 4.8 air changes per hour. Medify's own page says 172 see the note below |
| CARB | Certified, device type Mechanical, notified 2020-06-05, executive order G-20-116 |
| Noise | 19.8 dBA on speed 1, 37 dBA on speed 2, 49.3 dBA on speed 3 a figure per speed, not a range |
| Power | 28 W stated by Medify AHAM recorded 26.2 operating watts during its smoke test |
| Filter life | 2,500 hours, which Medify puts at 3–4 months |
| Dust CADR | 123 cfm, AHAM Verifide |
|---|---|
| Pollen CADR | 123 cfm, AHAM Verifide |
| PM2.5 CADR | 116 cfm, AHAM Verifide Medify publishes the same figure |
| Manufacturer coverage ladder | 825 sq ft at 1 air change, 413 at 2, 206 at 4, 165 at 5 published in full by Medify |
| Dimensions | 13.5 x 8 x 8 in |
| Weight | 7.3 lb |
| Energy | Integrated energy factor 4.4 cfm/W and 160 kWh a year both Medify's own figures |
| Warranty | Limited lifetime warranty |
Our calculation, not the manufacturer’s
| Air changes | When you want this rate | Room it suits |
|---|---|---|
| 4.8×/hour | Wildfire smoke, allergy season, a room you are sensitive in | 172 ft² |
| 4×/hour | The rate most allergy guidance assumes | 206 ft² |
| 2×/hour | General freshening in a room without a specific problem | 413 ft² |
Worked from the CDC/NIOSH relation
air changes = (CADR × 60) ÷ (area × ceiling height),
assuming an 8 ft ceiling. Change the ceiling height and these
numbers change. AHAM’s own consumer rule — a smoke CADR of at
least two-thirds of the room’s area — puts the ceiling for this
unit at about 165 ft², which is the same arithmetic
at roughly five air changes an hour.
You can check this at home. In a closed room of the size in the first row, PM2.5 should halve about every nine minutes at top speed once its source stops. A monitor shows whether this unit manages that in your home. How to run the test
Ionizer and ozone
CARB lists it Mechanical, and within Medify's own range that is a distinction rather than a formality.
CARB's complete list carries exactly one row for this model: "Medify Air | Air Purifier | MA-25 | Mechanical | 2020-06-05 | G-20-116". Mechanical means California's certifier identified no ozone-generating component, so the unit was never subject to the ozone emission test that Electronic devices must pass.
The reason that is worth saying out loud: Medify's range is genuinely mixed. Reading the full CARB list, thirty Medify rows appear, and the MA-14, MA-15, MA-18, MA-50, MA-60, MA-125, MA-1000, MA-WM35, MA-WM45, MA-112UV and MA-40UV are all classified Electronic — as was the MA-40 itself in its 2019 and 2021 certifications, before later revisions came back Mechanical. Medify's own site says "Medify purifiers with ionizers are tested and verified zero ozone", which confirms that some models in the range have one. This one does not, per CARB, and Medify's page for it describes no ionizer, no UV lamp and no ozone stage.
The limit of that finding: there is a single certification, from 2020, and it has never been revised. If Medify ships a later hardware revision of the MA-25, it would not be covered by G-20-116.
| Capability | What it needs | Status |
|---|---|---|
| Particle filtration | 3-stage filter set, pre-installed | Included |
| Odour reduction | Active carbon composite, part of the same set | Included |
| Child lock | Built in | Included |
| Air quality sensor or auto mode | Not offered on this model | Not offered |
| App, Wi-Fi or voice control | Not offered on this model | Not offered |
| Replacement filter set | MA-25 replacement filter set, sold separately, every 2,500 hours | Sold separately |
| Published part code for the filter | Medify does not print one on the filter's page | Not verified |
Package contents vary by variant and seller. Check what is in the box on the Amazon listing before you buy. “Not verified” means the manufacturer does not document it either way — not that it is missing. “Not offered” is the other thing: the manufacturer does document it, and the answer is that this model does not have it.
Medify MA-25 replacement filter set
Part ⚠️ MEDIFY PUBLISHES NO PART CODE FOR THIS FILTER. Its own page for the MA-25 replacement set gives no model code, no SKU and no UPC. The product title · ⚠️ NOT STATED ON THIS PAGE. Medify's page for the filter itself gives no interval at all. The figure comes from the machine's page instead: "2,500 hours (3-4 months)". Run continuously, 2,500 hours is a little under 105 days, so three to four months is consistent with continuous use rather than with occasional use. A third figure exists and does not quite match either: Medify's filter subscription ships every 120 days. That is four months, at the far end of the stated range. The practical reading: budget three to four sets a year if the machine runs continuously, and treat 2,500 hours rather than the calendar as the real trigger.
Checked against the AHAM Verifide directory, CARB's certified air-cleaner list, the ENERGY STAR certified-products list and the manufacturer's own pages. We did not test this unit. Nothing here is a measurement of ours: every figure is either documented by the manufacturer or published by an independent standards or testing body, and where the two disagree this page says so.
Blueair
AHAM Verifide at 353 cfm smoke CADR for a 550 sq ft room, and Blueair publishes exactly those numbers rather than a flattering pair — which almost nothing else in this catalogue does. It draws 4 W on its lowest speed.
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Blueair
AHAM Verifide at 283 cfm smoke for a 439 sq ft room, and the rare case where the electrostatic question has an actual number attached: ENERGY STAR measured its ozone emission at 2 ppb.
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Blueair
A compact tower with an AHAM Verifide smoke CADR of 123 cfm and a 190 sq ft AHAM room size. CARB classifies it Electronic, which is a consequence of how Blueair's HEPASilent works rather than a fault.
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