Search for Medify air purifier decibels and the answer is unusually complete. Every Medify product page has a "Sound Level" line with a dBA figure for each fan speed, from Speed 1 to the top speed, and three models add a Sleep Mode figure. Four models also print the clean air delivery rate, or CADR, at each speed, so you can see how much air the quiet setting moves.
We read the US product page and the user manual for every air purifier in Medify Air's US purifier collection. Six models are on sale, and all six carry a figure for every speed: the MA-14, MA-25, MA-40, MA-50 V3.0, MA-112 PRO and MA-1400 PRO. This page lists all of them, explains what Medify's labels mean, and ranks each model only against others in the same room-size group and at the same speed label.
Our picks are listed above, with full specifications for each.
Each Medify spec table gives a "Sound Level" block, for example "Speed 1: 21.2 dBA Speed 2: 32.3 dBA Speed 3: 42.7 dBA Speed 4: 60.6 dBA Sleep Mode: 21.7 dBA" on the MA-50 V3.0. The labels tie each figure to a named fan speed, so you know which setting you are reading. Medify does not state a measuring distance or a test standard for any of them.
The manuals for the four home models go one step further. Their specification tables put the same figures under "Noise level (dBA sound pressure)". Sound pressure is the sound reaching a listener, which is what you hear in a room. Some makers print sound power instead, which describes the machine itself and runs higher. Our explainer on sound power vs sound pressure covers the difference, and why one cannot be read as the other.
Speed 1 is always the lowest speed. The top speed is not the same label on every model. The MA-14, MA-25 and MA-40 have three speeds, so Speed 3 is their top. The MA-14 manual says "Speed 1 is low", "Speed 2 is medium", "Speed 3 is fast" and "Speed “S” is sleep mode." The MA-50 V3.0, MA-112 PRO and MA-1400 PRO have four speeds, so their Speed 3 is a middle speed and Speed 4 is the top. That is why we rank Speed 3 only among the three-speed models, and top speeds only within a group of models that share the same label.
We group the models by Medify's own room sizes. The small-room group, the MA-14 and MA-25, is AHAM Verifide for 89 to 172 sq ft at 4.8 air changes an hour. The medium-room group, the MA-40 and MA-50 V3.0, is rated for 373 and 550 sq ft. The extra-large group is the two PRO models, which Medify rates at 1,487 sq ft every 15 minutes or more. Within a group, we rank figures at the same speed label only.
Small-room group, quietest first at each speed
- Speed 1: MA-25, 19.8 dBA; MA-14, 29.5 dBA.
- Speed 2: MA-25, 37 dBA; MA-14, 37.2 dBA. A tie.
- Speed 3, the top speed on both: MA-14, 48.3 dBA; MA-25, 49.3 dBA. A 1 dBA gap, which we treat as a tie.
- Sleep Mode: MA-14, 26 dBA. Medify publishes no Sleep Mode figure for the MA-25.
Medium-room group, quietest first at each speed
- Speed 1: MA-50 V3.0, 21.2 dBA at 19.0 CFM; MA-40, 40.5 dBA at 144.3 CFM.
- Speed 2: MA-50 V3.0, 32.3 dBA at 90.6 CFM; MA-40, 50.3 dBA at 181.2 CFM.
- Speed 3: MA-50 V3.0, 42.7 dBA at 159.5 CFM; MA-40, 53.3 dBA at 239 CFM. This is the MA-40's top speed but not the MA-50 V3.0's.
- Sleep Mode: MA-50 V3.0, 21.7 dBA; MA-40, 40.5 dBA at 111.8 CFM.
- Speed 4: MA-50 V3.0 only, 60.6 dBA at 352 CFM.
Extra-large group, quietest first at each speed (product pages)
- Speed 1: MA-112 PRO, 24.6 dBA at 171 CFM; MA-1400 PRO, 40.9 dBA at 350 CFM.
- Speed 2: MA-112 PRO, 41.7 dBA at 387 CFM; MA-1400 PRO, 56.2 dBA at 663 CFM.
- Speed 3: MA-112 PRO, 52.3 dBA at 539 CFM; MA-1400 PRO, 67 dBA at 1,129 CFM.
- Speed 4: MA-112 PRO, 58.1 dBA at 793 CFM; MA-1400 PRO, 70.3 dBA at 1,290 CFM.
Two things stand out. In the medium-room group, the MA-50 V3.0 is quieter at every shared speed, but its Speed 1 moves a small fraction of the air the MA-40 moves on Speed 1. On Medify's own CADR figures, the MA-40's Speed 1, at 144.3 CFM, sits between the MA-50 V3.0's Speed 2 and Speed 3. And in the small-room group, the two models are level everywhere except Speed 1, where the MA-25 is almost 10 dBA lower.
What the room sizes mean
Medify headlines room sizes at two air changes an hour. The MA-25 page says 413 sq ft "every 30 min.", and the same table gives "AHAM Verifide at 172 square feet every 12.5 mins (4.8 ACH)". The 4.8 figure is the usual sizing basis, and the one we use. Medify's footnote adds that the smoke CADR is measured "when operating at highest fan speed", which means every room size assumes the loudest speed.
That matters for noise. A purifier rated near your room's size needs its top speed to keep up, and on a Medify the top speed is 48.3 to 70.3 dBA. A purifier rated well above your room can stay on Speed 1 or Speed 2. The MA-50 V3.0 is a good example: its 90.6 CFM on Speed 2 is enough for a room of about 135 sq ft on AHAM's two-thirds rule, by our arithmetic, at 32.3 dBA. Our bedroom air purifier guide works through that sum for a typical bedroom.
What the gaps mean
Decibels are logarithmic. Roughly every 10 dB sounds about twice as loud. So the MA-25's step from 19.8 dBA on Speed 1 to 37 dBA on Speed 2 is more than a doubling, and its 49.3 dBA on Speed 3 is close to four times as loud as Speed 1. The MA-50 V3.0's step from 42.7 dBA on Speed 3 to 60.6 dBA on Speed 4 is the largest single jump Medify prints. Gaps of 1 dBA or so, such as the MA-14 against the MA-25 on Speed 2, are no gap at all when no distance is stated. Our decibel chart sets published appliance figures beside everyday sounds such as a whisper and a fridge.
Medify's quiet features, by their real names
Sleep Mode (MA-14). The manual says "After 5 seconds, all lights will turn off and only the S button will show with partial lighting." Medify lists 26 dBA in Sleep Mode against 29.5 dBA on Speed 1, so this is the one model where Sleep is listed as quieter than the lowest numbered speed.
Sleep Mode (MA-40). The manual says "Sleep mode is also available and will operate on the low fan speed setting and dim the lights." The page lists Sleep at 40.5 dBA, the same as Speed 1, and says "sleep mode for quiet nights (as low as 40.5 dBA)".
Sleep Mode (MA-50 V3.0). The manual says Sleep turns off the control panel lights "except the sleep button indicator", turns off the display, and "The fan is set to speed 1." Medify lists it at 21.7 dBA, 0.5 dBA above Speed 1, which Medify does not explain.
Dimmer. The MA-50 V3.0, MA-112 PRO and MA-1400 PRO manuals say "there are 4 brightness levels to change for all buttons' backlight LEDs." The MA-25's controls also list a Dimmer.
Timer. The MA-50 V3.0, MA-112 PRO and MA-1400 PRO cycle through 2, 4, 8 and 12 hours. The MA-40 manual gives "1, 2, 4, 8 or no timer." A timer lets the purifier switch itself off after you fall asleep.
No auto mode. None of the six lists an auto mode or an air quality sensor in its controls or manual. The fan stays on the speed you choose, so nothing ramps up in the night.
Sleep Mode on the PRO models. Both PRO product pages show a Sleep Mode badge, and the MA-112 PRO's controls line lists it. Neither manual describes a Sleep Mode, and Medify publishes no Sleep figure for either, so we do not count it.
Keeping a Medify quiet
Placement matters as much as the speed. The MA-14, MA-25, MA-40 and MA-50 V3.0 manuals say "Make sure there is AT LEAST a 20-inch (50 cm) distance between the air inlet and the wall or nearby furniture." A unit pushed into a corner is short of air and may need a higher speed. The troubleshooting tables in the PRO manuals list "Excessive noise" with the cause "The unit is not level", so set it on a flat floor. The MA-40 manual adds that "After plugging it in, the air purifier will beep", which matters only once. Replace the filter on schedule, since a clogged filter makes the fan work harder for the same air. For a desk or office, where a middle speed runs all day, our home office air purifier guide compares Medify's Speed 2 figures in detail.
The two PRO models have product pages and manuals that do not match. The MA-112 PRO page lists "Speed 1: 24.6 dBA Speed 2: 41.7 dBA Speed 3: 52.3 dBA Speed 4: 58.1 dBA". Its manual's "Noise Levels" table gives "33.1 dB 35.4 dB 46.6 dB 62.0 dB" for speeds 1 to 4. The MA-1400 PRO page lists 40.9, 56.2, 67 and 70.3 dBA, and its manual gives "29.1 dB 44.8 dB 54.2 dB" for speeds 1 to 3 and 58.4 dB for speed 4. On the manual figures, the MA-1400 PRO is lower than the MA-112 PRO on Speed 1 and Speed 4, the reverse of the product pages. We rank on the product pages, because they use the same dBA label as the home models, and we would not lean on either PRO ranking.
Smaller gaps appear on the home models. The MA-14 page says 89 sq ft at 4.8 air changes an hour and its manual says 117 sq ft, and the two give different CADR and weight. The MA-40 page says 68W and 17.5 lbs, and its manual says 85W and 15.5 lbs. The noise figures on those four models match between page and manual. The MA-112 PRO page also says "2,974 sq ft" in its headline and "2,947 sq. ft." in its comparison table.
Medify still sells filters for older purifiers, including the MA-15, MA-18, MA-35, MA-112 and MA-125, but none of those purifiers is in its US collection or has a product page on medifyair.com. We list no figures for them.
How Medify compares
This page ranks Medify models only against each other. For how they sit among other brands, on each maker's own published figures, see our guide to the quietest air purifiers. Medify, like most makers, states no measuring distance or standard, so read our explainer on why decibel ratings rarely compare across brands before treating a small gap as real. For another brand that prints a figure for every speed, see our Rabbit Air purifier decibels page, and for a budget comparison that includes the MA-14, our guide to quiet air purifiers under $100.
How we chose
We read Medify Air's US purifier collection, its product listing and its sitemap, and opened the product page and user manual for every purifier on sale. We recorded each noise figure in Medify's words, with the speed it describes, and noted where a page and its manual disagree. We grouped models by Medify's own room sizes and ranked figures at the same speed label only within a group. Prices are Medify's US list prices on medifyair.com, which we last checked on October 5, 2026.
We did not measure any of these purifiers. Every figure here is Medify's own, from its product pages and manuals, and Medify states no measuring distance or test standard for any of them. Owners' rooms, floors and filters will change what they hear.
