A purifier in a home with a dog or cat lives a different life from one in a bedroom. It runs through the day, while fur drifts and the litter gets kicked about, and it runs above its quietest setting. So the figure you will actually hear is not the low number on the box, and in every case here the maker does not publish it.
This guide is the pet follow up to our main guide to the quietest air purifiers, which explains why the airflow rating and the quiet figure describe opposite ends of the machine. Here we read the makers' pages and manuals for what changes the noise in a pet home: pet modes, pre-filters that clog with fur, auto modes that chase the litter box, and beeps and lights. We make no health claims, and we have left the makers' allergy claims out.
Our picks are listed above, with full specifications for each.
The speed you actually run with a shedding pet
The low figures in this guide, from 20.3 to 29, describe each machine at its gentlest, and with a pet you will spend little time there. Levoit's own Pet Mode on the Vital 200S-P shows why. Its manual says Pet Mode runs 15 minutes at high speed, then 60 minutes at medium, and cycles between the two. In a dark room with Light Detection on, it stays on medium.
So a Vital 200S-P in Pet Mode spends most of each hour on medium and the rest on high. Levoit prints 23-54dB for it and does not say which setting either end describes. It publishes nothing for medium. That gap is the same at every maker here: nobody publishes a figure for a middle speed.
What does that mean in a living room? The National Park Service explains that every 10 decibels is a doubling of perceived loudness. On that rule, the 31 dB gap between the two ends of the Vital 200S-P's range means its top figure describes something about eight times as loud as its bottom one, on paper. Medium sits somewhere in between, and Levoit does not say where. In a living room with a TV or conversation, a middle speed may blend in. In a quiet den at night, it may not.
The practical answer is the one our main guide gives for bedrooms, with a pet twist: buy a unit rated well above your room, so it keeps up with shedding on a lower speed. Rabbit Air is the one maker here that shows the airflow range, 64 to 286 CFM for the A3, which makes plain how much air the lower speeds give up.
Sizing for the room your pet lives in
AHAM's rule of thumb is that the smoke CADR should be at least two-thirds of the room's area. For rooms pets tend to rule:
- A 12 by 14 foot den, 168 sq ft: smoke CADR of at least 112.
- A 15 by 20 foot living room, 300 sq ft: at least 200.
- A 20 by 25 foot open area, 500 sq ft: at least 333.
Then compare the makers' room sizes on the same basis. Levoit and Blueair quote them at 4.8 air changes an hour, AHAM's standard: 217 sq ft for the Core P350-P, 229 for the Vital Pet Pro, 271 for the PetAir Pro and 388 for the Vital 200S-P. Rabbit Air quotes 535 sq ft for the A3 at 4 air changes an hour, which is a less demanding basis than 4.8. Coway gives the Airmega 350 only at 1 and 2 air changes an hour, 1,320 ft2 at 2, but its smoke CADR of 352 clears AHAM's rule for a room of about 500 sq ft. Levoit publishes no CADR for the Vital Pet Pro.
Pre-filters, fur and noise
A pre-filter is a coarse mesh in front of the main filter that catches hair and lint. In a pet home it fills quickly, and the manuals say plainly what happens then.
- Blueair PetAir Pro. Under "Purifier makes too much noise", the manual says: "If the filter is too dirty and clogged, the purifier will not get sufficient airflow which may result in increased noise." The fix it gives is to clean the main filter, the pre-filter and the pet fur collection tray.
- Levoit Vital 200S-P and Core P350-P. Both manuals say the pre-filter "may be clogged by large particles, such as hair or lint," blocking airflow. The Vital 200S-P manual lists "Increased noise when the air purifier is on" as a sign the main filter needs replacing.
- Coway Airmega 350. If the airflow has weakened, the manual's first check is whether the pre-filter has been cleaned.
How often the makers want it cleaned varies a lot. Levoit says every 2 to 4 weeks for the Vital 200S-P and the Core P350-P, and Coway says the same for the Airmega 350. Winix says once every 14 days for the 5510. Rabbit Air says every 3 months for the A3, with a red light to remind you. Levoit's Vital Pet Pro scrapes its own pre-filter into a tray once a day by default and asks for a hand clean about once a month.
Washing differs too. The Vital 200S-P's pre-filter can be washed with water and mild detergent. The Core P350-P's and the Airmega 350's cannot: brush or vacuum only. Rabbit Air's can be washed but needs 12 to 24 hours to dry, so plan for a day without it.
Our explainer on why your appliance got louder covers the same pattern in other machines: a filter or path that clogs slowly, and a noise that creeps up so gradually you stop noticing it. Fur does the same to a robot vacuum's brushes, and our pet robot vacuum guide notes which makers name a certifier for their tangle claims.
Auto modes, the litter box and a pet walking by
Auto mode raises the fan when its sensor sees worse air, and a pet home gives it plenty to see: a dog shaking off, a cat digging in the litter. Rabbit Air describes the sequence for the A3: when it senses particles or odors, the machine increases fan speed, switches over to high speed until the air has been cleaned, then returns to its original speed. Levoit says the Vital Pet Pro's Auto Mode detects odors and TVOCs as well as particles, so litter box smells can wake it.
Three makers give you a way to rein that in:
- Sensor sensitivity. Rabbit Air's A3 cycles its sensor through High, Medium and Low sensitivity. Coway's Airmega 350 manual lets you set the sensor to Sensitive, Standard or Insensitive.
- A cap on the fan. Levoit's Quiet Auto Mode on the Vital 200S-P uses medium "instead of the high or turbo fan speeds, even when the air quality is poor, to avoid making too much noise." With Light Detection on in a dark room, Pet Mode and Auto Mode stop at medium too.
- No auto mode at all. The Core P350-P's manual describes no auto mode or sensor, so it never speeds up on its own.
Blueair's PetAir Pro works the other way round. Its Smart Mode reads weight on the bed, and the manual says that when a pet is lying on it "it goes into Silent Mode". When the pet leaves, it returns to adjusting by air quality.
Beeps, lights and paws
No maker here publishes anything about the pitch or volume of its beeps, or about how pets react to them, so we only report which units let you silence the buttons, switch the lights off or lock the controls.
- Coway Airmega 350: a button mute, turned on by pressing and holding the airflow speed and light buttons for more than 3 seconds. Its Sleep Mode turns off all display lights.
- Rabbit Air A3: with the Light Sensor activated, all LEDs and the mood light turn off when the room has been dark for 3 minutes.
- Levoit Vital 200S-P: a Display Off button turns off the button and indicator lights, except the Check Filter Indicator.
- Levoit Core P350-P: in Sleep Mode the indicators drop to half brightness rather than off.
- Blueair PetAir Pro: Night mode sets the lowest fan speed and brightness.
Paws on buttons are a real problem with a unit at floor level. The Core P350-P has a Pet Lock, which its manual says stops settings being changed by children or pets. The Vital Pet Pro and Vital 200S-P have display locks, and the PetAir Pro locks its controls when a pet lies on it.
Cords are the other pet hazard. Levoit gives the Vital Pet Pro a chew-resistant nylon cord. The Core P350-P's warranty excludes damage caused by animals, so keep its cord out of reach.
Where to put it
Keep it clear of the pet's favourite spot and of the litter box itself, if you want auto mode calm. Levoit asks for 15 inches of clearance on all sides of the Core P350-P, and Winix asks for 12 to 18 inches from walls and warns that flimsy or slanted surfaces may cause abnormal noise and vibrations. Blueair asks for at least 4 inches around the PetAir Pro and warns against putting more than 1.1 lb on it, since weight is how it senses your pet. If a litter box shares the room, our guide to the quietest self-cleaning litter boxes covers the other machine running in there.
What quiet costs in a pet home
- Filters. Pet and odor filters cost more: $59.99 for Levoit's Vital 200S-P Pet Allergy carbon filter against $44.99 on sale, $49.99 regular, for the standard one, and $89.99 for the PetAir Pro. Levoit says the Vital Pet Pro's main filter lasts 6 months, sooner with several pets.
- Size. The units with the most headroom are big. The Rabbit Air A3 is 19.7 inches tall and 20.3 lb; the PetAir Pro is 23 inches wide and 18.9 lb.
- Price. The Core P350-P is $129.99 list; the A3 is $749.95.
- Maintenance. Every fortnight to every month, depending on the maker, someone has to clean a pre-filter full of fur.
Makers we left out
Shark sells an air purifier for pets, the HP102PET, but its product page publishes no decibel figure, so we have nothing to quote. We could not open Molekule's current product pages to check a figure, so we left it out rather than quote one secondhand. For every Levoit model, including the two pet units here, our Levoit air purifier decibels page lists each published range. Coway's, Blueair's and Winix's full ranges are on our pages for every Airmega, every Blueair and every Winix.
For more on the units, see dBA explained and why you cannot compare dB ratings across brands. If the purifier ends up in the bedroom where your pet sleeps, our bedroom air purifier guide and the quiet bedroom checklist cover the night.
How we chose
We started from purifiers sold for pets or with a pet filter option, and kept the ones whose makers publish a noise figure: Levoit's Vital Pet Pro and Core P350-P, Blueair's PetAir Pro, Rabbit Air's A3 with its Pet Allergy filter, the Levoit Vital 200S-P with its Pet Mode, and the Coway Airmega 350 from Coway's Pet Defense collection. For each one we reopened the product page and, where one is published, the manual, and recorded the noise figure in the maker's words. None of them names the setting behind both ends of its range, so we did not rank one maker's figure against another's. We ranked for a pet home: what the pet setting does, how the pre-filter copes with fur, how auto mode can be held back, and whether beeps and lights can be silenced.
We did not measure any of these purifiers ourselves. Every figure here comes from the maker's own page or manual, no maker states the distance or standard behind its noise figure, and where a page and a manual disagree we quote both.
