9 Best Portable HEPA Air Purifiers (November 2026)
The best portable HEPA air purifiers include the Levoit Air Purifier for Home Pets Hair for most bedrooms, the COWAY Air Purifier for Home Up for automatic air cleaning, and the Levoit Air Purifiers for Bedroom Home Pets for small personal spaces.
On this page (5 sections)
The best portable HEPA air purifier for most homes is the Levoit Air Purifier for Home Pets Hair, because it combines a compact 7.9 lb body, AHAM verification, a 143 CFM CADR and 24 dB Sleep Mode.
That mix suits a bedroom, office or smaller living area where you want proven particle cleaning without a large fixed cabinet.
Pick Coway or KNKA for larger rooms, or PureZone Mini for cordless personal use.
We compared portable HEPA air purifiers by filtration, airflow, room guidance, weight, size, power needs and daily controls.
CADR figures help compare cleaning speed more fairly than room size alone.
Placement matters as much as the headline number in daily use.
A purifier tucked behind furniture cannot move room air as well as one with clear intake and outlet space.
Noise also shapes real use, since a quiet Sleep Mode makes overnight running more practical.
Weight and shape decide how often you will move the unit between rooms.
A 7.9 lb cabinet suits occasional moves, while sub 2 lb models are easier to carry daily.
Power needs should be checked before you buy, because AC, Type-C and battery models fit different routines.
Filter care is another daily factor, including replacement timing and whether the pre-filter can be washed.
If you need air cleaning close to your body while moving around, compare a wearable portable air purifier.
For filter care, see our guide to the best portable air purifier with washable filter.
Our picks at a glance
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3
Best for small personal spacesLevoit Air Purifiers for Bedroom Home Pets
9.5/10 our score
See it on Amazon
- 4
Best for compact wide-area coverageCheck it - 5
Check itPuroAir 240 HEPA Air Purifiers for Home
Best for large bedrooms - 6
Best for travel by outlet or power bankCheck it - 7
Check itFULMINARE Air Purifiers for Bedroom
Best for quiet night use - 8
Check itKNKA Air Purifiers for Home Bedroom Up
Best for larger spaces with air readings - 9
Check itPure Enrichment® PureZone™ Mini Portable Air Purifier
Best for cordless personal use
The best portable HEPA air purifier picks
These are the best portable HEPA air purifier options in score order. The score weighs specs, features and buyer feedback against the needs of someone who wants to move filtered air between occupied spaces.
Levoit Air Purifier for Home Pets Hair: Best for most bedrooms
- 143 CFM CADR
- AHAM verified
- 24 dB Sleep Mode
- 7.9 lb weight
The compact Core 300-P combines a 143 CFM CADR, quiet 24 dB Sleep Mode and AHAM verification. It fits bedrooms and offices where you want strong particle cleaning without a large cabinet.
Pros
- AHAM verified
- Quiet Sleep Mode
- Touch controls and timer
Cons
- 120V use only
- AC power required
The Levoit Core 300-P is the strongest all-around choice for a bedroom, office or smaller living area. Its 143 CFM CADR and AHAM verification give you clearer performance information than a portable purifier that only uses broad coverage language.
The unit measures 8.7 x 8.7 x 14.2 inches and weighs 7.9 pounds. That is light enough to move between rooms, but it is more substantial than the personal travel models below.
Levoit states that its filter has 99.97% efficiency for 0.1 to 0.3 μm airborne particles, including pollen, dust and animal dander allergens. The three-stage filter also addresses odors and volatile organic compounds.
Sleep Mode reduces noise to 24 dB, and the display can be turned off. A touch timer offers 2, 4, 6 or 8 hours, while a check filter indicator helps with routine care.
The 120V power requirement means this model is for use in the United States. Use official replacement filters, and keep the cord away from pets.
COWAY Air Purifier for Home Up: Best for automatic air cleaning
- Up to 1,748 ft² in 60 minutes
- Washable pre-filter
- Air quality monitor
- Auto and Eco modes
Coway adds an air quality sensor, automatic fan control and a four-stage filtration system. Its 12.5 lb body is less travel-friendly than smaller picks, but it suits rooms where automatic adjustment matters.
Pros
- Air quality indicator
- Auto and Eco modes
- Washable pre-filter
Cons
- Heavier than compact picks
- Larger footprint
Coway is the better portable choice when you want automatic fan adjustment and air quality feedback. Its air quality indicator uses colored light, and Auto Mode adjusts the fan based on the sensor reading.
The Mighty AP-1512HH(W) measures 9.6 x 16.8 x 18.3 inches and weighs 12.5 pounds. It is still movable between rooms, but its larger body makes it more of a room-to-room purifier than a travel unit.
Its four-stage system includes a washable pre-filter, deodorization filter, bipolar device and HEPA filter. The combination is designed to reduce 0.3 micron particles, odors and volatile organic compounds.
Coway states that the unit can clean spaces up to 1,748 square feet in 60 minutes. Room shape, doors and operating speed affect real-world circulation, so place it where air can reach the intake and outlet.
The washable pre-filter adds a useful maintenance step. The filter indicator also tells you when the main filters need replacement.
Levoit Air Purifiers for Bedroom Home Pets: Best for small personal spaces
- 2.2 lb weight
- 27 to 45 dB noise range
- Sleep Mode
- Auto-off display
The Core Mini-P is easy to move between a bedroom, office or kitchen. Its small size and 2.2 lb weight suit personal spaces, while the compact filter design means it is not the strongest choice for a large open room.
Pros
- Very light
- Small footprint
- Sleep Mode
Cons
- Best suited to smaller spaces
- Essential oil use needs care
The Levoit Core Mini-P suits a bedroom, dorm room, office or kitchen where low weight and a small footprint matter most. At 2.2 pounds and about 6.5 x 6.5 x 10.4 inches, it is easy to place beside a bed or on a desk.
Its pre-filter and main filter capture lint, hair, pet dander, fine airborne pollutants and smoke particles. The purifier also helps neutralize odors, smoke and fumes.
The power adapter accepts 100 to 240V at 50/60 Hz, and the rated power is 7W. It operates from 27 to 45 dB, with Sleep Mode and an auto-off display for nighttime use.
Levoit includes an aromatherapy option, but use only 2 to 3 drops of essential oil. Too much oil can overflow and damage plastic parts.
Choose this model for personal spaces and easy movement. For a larger room, use the CADR information from the Levoit Core 300-P or choose a bigger purifier.
VOOPNU Air Purifiers for Home: Best for compact wide-area coverage
- Up to 1,076 ft² stated coverage
- 360° air intake
- 22 dB operation
- Triple-layer filtration
VOOPNU packs 360° intake and a triple-layer filter into a 2.54 lb cabinet. Its 22 dB operation suits quiet rooms, while the Standard and Pet-Care filter choices let you match the unit to your household.
Pros
- Lightweight
- Quiet operation
- 360° intake
Cons
- Filter edition must match your needs
- Coverage claims vary by room conditions
VOOPNU gives you a compact option with 360° air intake and a stated coverage area up to 1,076 square feet.
The 6.69 x 6.69 x 9.84 inch body weighs 2.54 pounds, so it is easy to carry between occupied spaces.
That size suits a desk, bedside table or corner where a taller tower would take too much floor space.
Its triple-layer filtration is designed to capture 99.97% of airborne pollutants.
The manufacturer states that laboratory testing cleaned 250 square feet every 15 minutes.
Use those figures as guidance rather than a promise for every room layout.
Room shape, open doors and run time can all change the result you notice.
The unit operates as quietly as 22 dB.
Low noise makes it practical for a bedroom, study or nursery at a gentle speed.
A built-in essential oil tray accepts 3 to 5 drops, and the control panel uses a simple one-tap design.
VOOPNU offers a Standard Edition filter and a Pet-Care Edition filter.
Pet homes may prefer the Pet-Care Edition for hair and dander, while other homes may stay with the Standard Edition.
Set up the unit with space around its intake so the 360° design can draw air from the room.
PuroAir 240 HEPA Air Purifiers for Home: Best for large bedrooms
- Up to 1,000 ft² in one hour
- Three-layer filtration
- Smart particle sensor
- Sleep Mode
The PuroAir 240 uses a pre-filter, HEPA filter and activated carbon layer in a tall 7.3 lb body. Its particle sensor can increase power when polluted air is detected, making it useful for a larger bedroom or living area.
Pros
- Large stated coverage
- Particle sensor
- Activated carbon layer
Cons
- Tall cabinet
- Needs more vertical space
PuroAir 240 is a strong fit for a large bedroom or living area where automatic particle sensing matters.
Its 10.63 x 10.63 x 28 inch cabinet weighs 7.3 pounds, with a tall shape that needs vertical clearance.
Check shelf height and bedside space before buying, because the tall body is less flexible than a short square unit.
The three-layer system combines a pre-filter, HEPA filter and activated carbon.
PuroAir states that the unit filters up to 99.9% of pollutants, including dust, pollen, smoke, pet dander and volatile organic compounds.
The pre-filter helps protect the HEPA layer from larger debris, while activated carbon is the part aimed at odors and certain gases.
Its stated coverage is up to 1,000 square feet in one hour.
Treat that as a whole room circulation guide, since furniture, doorways and fan speed will affect how quickly air moves through the space.
A smart particle sensor monitors air quality and increases power when polluted air is detected, while Sleep Mode supports quieter overnight operation.
That automatic response suits people who do not want to adjust the fan manually during the day.
The tall design may be less convenient to carry than a short square purifier.
It makes sense when the purifier will stay in one or two rooms and you want a larger stated coverage area.
Keep the intake clear and allow room around the top outlet for steady airflow.
TDBYWAE Air Purifier for Home: Best for travel by outlet or power bank
- 1.8 lb weight
- Type-C charging
- 16 dB Sleep Mode
- 600 ft² maximum coverage
TDBYWAE is a flat, 1.8 lb option for desks, cars, RVs, hotels and camping when a Type-C power source is available. It offers three fan speeds and timers, but it is not battery powered by itself.
Pros
- Lightweight
- Type-C power
- Flat portable design
Cons
- Requires plugged-in power or a power bank
- Filter replacement is recommended every 2 to 4 months
TDBYWAE is the most flexible pick for desks, cars, RVs, hotels and travel with access to Type-C power.
Its square 8.4 x 8.4 x 5 inch design weighs 1.8 pounds and can connect to a power bank.
The flat shape makes it easy to pack in a bag or place on a nightstand, desk or vehicle seat area.
The three-stage filter uses a pre-filter, true HEPA filter and activated carbon filter.
The unit is designed for dust, pollen, smoke, odors, PM 2.5 and pet dander.
That combination gives it a wider role than a particle only filter, since the carbon stage is aimed at odor concerns.
A 16 dB Sleep Mode keeps noise low, and the touch controls offer 3 fan speeds plus 2, 4 and 8 hour timers.
Timers are useful when you want timed operation while you are away or before a planned sleep period.
The flat shape is easier to pack than a tall tower.
This model is not battery powered by itself.
It needs the Type-C cable and adapter, or a compatible power bank for use away from a wall outlet.
Carry the correct cable and adapter with you, and confirm that your power bank can supply the unit before you rely on it in transit.
Replace the filter about every 2 to 4 months to keep the air purification effect strong.
FULMINARE Air Purifiers for Bedroom: Best for quiet night use
- H13 true HEPA filter
- About 20 dB low-speed operation
- 360° air outlet
- Five timer settings
FULMINARE uses an H13 HEPA filter and a dual-channel design in a 1.85 lb cabinet. Its low-speed operation is around 20 dB, and the separate night light and timer settings suit bedrooms.
Pros
- Very quiet low-speed setting
- Small footprint
- Five timer choices
Cons
- Plug-in design
- Filter replacement is normally every 3 months
FULMINARE suits light sleepers who want a small bedroom purifier with very low-speed noise.
Its H13 HEPA filter sits in a 5.71 x 5.71 x 7.88 inch cabinet weighing 1.85 pounds.
The small footprint makes it easy to place beside a bed or on a compact nightstand without crowding the room.
The dual-channel design uses a 360° air outlet and is rated for rooms up to 1,086 square feet based on 5 air changes per hour.
That air change rate describes repeated circulation rather than a single pass of air through the filter.
The compact shape makes it easy to move, though the unit remains plug-in rather than battery powered.
You will need an accessible outlet in each room where you plan to use it.
FULMINARE states that low-speed operation is around 20 dB.
That low level is aimed at light sleepers, although higher fan speeds will be louder when faster cleaning is needed.
It also includes a separate night light and timer choices of 2, 4, 8, 10 and 12 hours.
The night light can suit a child room or a dark hallway, and the timers help when you want the unit to stop after a set period.
Remove the filter's plastic packaging before running the purifier.
The brand recommends replacing the filter about every 3 months, and the PU-P05 replacement filter is the matching model.
Keep the bottom base cover and charging adapter in a safe place so setup stays simple.
KNKA Air Purifiers for Home Bedroom Up: Best for larger spaces with air readings
- AHAM verified
- 226 CFM smoke and dust CADR
- Real-time AQI display
- Pet and Eco modes
KNKA is the largest and heaviest pick here, but its 226 CFM smoke and dust CADR, dual filter cartridges and AQI display suit bigger rooms. Pet, Eco, Auto and Sleep modes add more control than basic portable units.
Pros
- High CADR
- AHAM verified
- AQI display
Cons
- Heavier to move
- Larger cabinet
KNKA is the best choice here for larger spaces where you want a high CADR and visible air readings.
Its AHAM-verified APH4000 provides a 226 CFM smoke, dust and PM2.5 CADR and a 244 CFM pollen CADR.
Those figures point to faster cleaning for common particles than smaller portable units in this group.
The unit measures 8.15 x 12.36 x 17.09 inches and weighs 9.68 pounds.
It is still movable, but the size and weight make it a room to room choice rather than a pocket travel option.
Dual front and back intakes feed two filter cartridges, while side outlets help move cleaned air into the room.
That layout increases the filter area and helps circulation in a larger space.
KNKA states that the purifier refreshes a 350 square foot room 4.8 times per hour and can reach up to 1,695 square feet at one air refresh per hour.
Those are different use cases, so match the smaller figure to rooms where faster cleaning matters.
For a big open area, expect slower cleaning and keep doors or airflow paths in mind.
Pet Mode increases airflow for pet hair, dander and odors.
Eco Mode can enter standby when air quality is good, and the real-time AQI display makes changes easier to see.
Sleep Mode is listed at 22 to 24 dB, which helps when the unit stays in a bedroom.
Replace the filters every 3 to 6 months and remove the plastic packaging before installation.
Pure Enrichment® PureZone™ Mini Portable Air Purifier: Best for cordless personal use
- Cordless operation
- Up to 12 hours on low
- Less than 1 lb
- Three fan speeds
PureZone Mini is the clearest travel choice because its rechargeable lithium-ion battery can run for up to 12 hours on low. The 9.6 oz body is built for personal air near you, not for cleaning a whole room.
Pros
- Cordless
- Very light
- Adjustable handle
Cons
- Personal coverage only
- Smallest airflow capacity here
Pure Enrichment PureZone Mini is the clear pick for cordless personal air cleaning.
The 9.6 oz purifier uses a rechargeable lithium-ion battery that lasts up to 12 hours on low, so you can use it in a car, office or school setting without a wall outlet.
That battery life is stated for the low setting, so higher speeds will use power faster.
The two-stage filter combines an activated carbon pre-filter with a true HEPA filter.
The purifier is designed for personal space use and cleans 6 square feet in 12 minutes based on its stated AHAM calculation.
Those numbers show its intended role clearly, since it focuses on air close to you rather than a full room.
Its adjustable handle lets you place it upright or on its side.
You can also remove the handle, and 3 fan speeds give you more control over noise and airflow.
On high, it can also act as a small personal fan, which may help in a car or at a desk.
The small size is also the main limit.
It is meant to clean air close to you, not replace a room purifier such as the Levoit Core 300-P, Coway Mighty or KNKA APH4000.
For travel, carry the USB charging cable and keep the unit charged before a long trip.
The 5-year manufacturer warranty gives added peace of mind for a portable device that may be moved often.
How we picked portable HEPA air purifiers
The best portable HEPA air purifier should balance filtration, airflow, size and power. A unit that is easy to carry but has limited personal coverage may be ideal for a desk, while a heavier model can make more sense for a bedroom.
We checked these factors:
- Filtration: HEPA, true HEPA, H13 or HEPA-grade wording, plus pre-filters and activated carbon.
- Airflow: CADR figures or clear room guidance, with attention to the air-change rate behind the coverage claim.
- Portability: weight, cabinet size, handle design and whether the purifier can move easily between rooms.
- Power: AC, Type-C, power bank use or a rechargeable battery.
- Daily operation: sleep noise, timers, filter alerts, auto modes and air quality displays.
- Care: filter packaging, replacement timing and washable pre-filter instructions.
The What Is a HEPA Air Purifier? A Quick Definition guide explains how HEPA filtration differs from general air-cleaning language.
If you're comparing device types, read Air Purifier vs Air Cleaner: What’s the Difference? before choosing by name alone.
The Association of Home Appliance Manufacturers explains how its air purifier verification program uses performance measures such as CADR. AHAM's air cleaner directory can help you check verified models.
| Product | Best for | Room coverage | Size | Filtration | Our score |
|---|---|---|---|---|---|
| Levoit Air Purifier for Home Pets Hair | most bedrooms | 222 ft² refreshed 4.8 times per hour; 1,073 ft² once per hour | 8.7 x 8.7 x 14.2 in | 3-in-1 filtration; 99.97% efficiency for 0.1 to 0.3 μm particles | 9.7 |
| COWAY Air Purifier for Home Up | automatic air cleaning | 9.6 x 16.8 x 18.3 in | Washable pre-filter, deodorization filter, bipolar device and HEPA filter | 9.5 | |
| Levoit Air Purifiers for Bedroom Home Pets | small personal spaces | 6.5 x 6.5 x 10.4 in | 9.5 | ||
| VOOPNU Air Purifiers for Home | compact wide-area coverage | 6.69 x 6.69 x 9.84 in | 9.5 | ||
| PuroAir 240 HEPA Air Purifiers for Home | large bedrooms | 10.63 x 10.63 x 28 in | 9.4 | ||
| TDBYWAE Air Purifier for Home | travel by outlet or power bank | 8.4 x 8.4 x 5 in | Pre-filter, true HEPA filter and activated carbon filter | 9.4 | |
| FULMINARE Air Purifiers for Bedroom | quiet night use | 5.71 x 5.71 x 7.88 in | 9.3 | ||
| KNKA Air Purifiers for Home Bedroom Up | larger spaces with air readings | 8.15 x 12.36 x 17.09 in | 9.1 | ||
| Pure Enrichment® PureZone™ Mini Portable Air Purifier | cordless personal use | 2.7 x 2.7 x 8.5 in | Activated carbon pre-filter and true HEPA filter | 8.8 |
How to choose the right portable HEPA air purifier
Choose by the room you will clean most often, then check how easily the unit can move. A personal purifier for a car or desk needs a different airflow target than one used in a bedroom or open living area.
What room size should a portable HEPA air purifier cover?
Use the room guidance and CADR together. KNKA and Coway suit larger spaces, while PureZone Mini is designed for personal air close to you.
The Levoit Core 300-P offers a useful middle ground for bedrooms and offices.
Coverage numbers are not interchangeable. One brand may describe a single air refresh in a large room, while another may describe repeated air changes in a smaller room.
Is a cordless air purifier better for travel?
A cordless model is better when you will use the purifier away from outlets. PureZone Mini runs on a rechargeable battery, while TDBYWAE can connect to a power bank through Type-C.
A plug-in purifier can still be portable if you move it between rooms with accessible outlets. Check the cable length and placement area before deciding that cordless operation is necessary.
For another battery-focused option, see our guide to the best rechargeable air purifier. If you want a wearable design around your neck, compare the best air purifier necklace.
Should you choose a washable pre-filter?
A washable pre-filter can catch larger particles before they reach the main filter. Coway and KNKA include washable pre-filter elements, while other models here rely on filter replacement and routine care.
Wash only the part the manufacturer identifies as washable. Let it dry fully before reinstalling it, and do not assume the HEPA or carbon layer can be washed.
How quiet should a portable air purifier be?
For sleeping, look for a stated low-speed or Sleep Mode noise level. FULMINARE states around 20 dB at low speed, VOOPNU states 22 dB, and Levoit Core 300-P lists 24 dB in Sleep Mode.
Noise can rise at higher fan speeds. If your room has smoke, dust or pet dander, a louder setting may clean faster than Sleep Mode.
Do portable HEPA air purifiers remove odors?
Models with activated carbon are the better fit for odor concerns. Coway, PuroAir, TDBYWAE, KNKA and PureZone Mini include carbon or deodorization stages.
Carbon performance depends on the amount and condition of the material, airflow and the source of the odor. Keep the source under control, and replace filters when the unit indicates it is time.
Portable HEPA air purifier setup and care
Place the purifier where its intake and outlet have open space.
Avoid pushing it tightly against a wall, curtain or furniture, and keep the air path clear so the fan can circulate room air.
A few inches of clearance can make a practical difference, especially for models with intake on several sides.
Think about where you spend time, since air near a bed, desk or sofa matters more than air near an empty wall.
Remove all plastic packaging from a replacement filter before starting the unit.
A sealed filter cannot clean air, so do this every time you install a new cartridge.
Follow the filter indicator or the brand's replacement guidance, since filter life changes with dust, smoke, pets and run time.
Homes with pets or frequent smoke may need earlier replacement than a low dust room.
Run the purifier consistently when the room needs regular cleaning.
Longer operation gives the filter more time to move room air through the cabinet than short bursts alone.
For overnight use, choose a quiet setting and turn off any display light that could disturb sleep.
Keep cords away from pets and inspect the plug before use.
Damaged cords should not be used, and loose cables in walkways can also be a trip hazard.
For Type-C or battery models, use the intended charging setup and keep the unit stable during travel.
Secure the unit in a car or bag so it does not tip, and keep its vents unblocked while it runs.
Clean washable pre-filters only when the manual allows it, and let them dry fully before reinstalling.
Do not wash HEPA or carbon layers unless the manufacturer specifically says that part is washable.
For larger-room planning, our guide to the best Levoit air purifier for large room compares room-focused Levoit options.
If you are choosing between two common brands, see Coway vs Winix air purifier for a broader comparison.
Final verdict on the best portable HEPA air purifier
The best portable HEPA air purifier for most bedrooms is the Levoit Air Purifier for Home Pets Hair.
It balances a 7.9 lb body, AHAM verification, a 143 CFM CADR and 24 dB Sleep Mode for everyday bedroom or office use.
Pick Coway when automatic sensing and a washable pre-filter matter, KNKA when you need higher CADR for a larger room, and PureZone Mini when cordless personal use is the priority.
Coway suits people who want the fan to respond to air quality without manual changes.
KNKA suits larger spaces where faster circulation and an AQI display are worth the bigger cabinet.
PureZone Mini suits cars, desks and travel because its battery removes the need for a wall outlet.
Choose TDBYWAE for Type-C travel, FULMINARE for quiet bedroom operation, VOOPNU for a compact 360° design, and PuroAir 240 for a tall purifier with a particle sensor.
TDBYWAE fits users who already carry Type-C gear or a power bank.
FULMINARE fits light sleepers who want low speed noise near the bed.
VOOPNU fits tight spaces where a light unit with wide intake is easier to place.
PuroAir 240 fits a larger bedroom or living area where a tall cabinet can stay in one spot.
Match the unit's airflow and power needs to the space you will actually use.
Check room size, outlet access, noise needs and filter replacement timing before you decide.
The right portable purifier is the one you will place well, run often and maintain on schedule.
Our top 3 picks at a glance
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Best for small personal spaces
Levoit Air Purifiers for Bedroom Home Pets
9.5/10 our score
See it on Amazon
Frequently asked questions
What is the best portable HEPA air purifier?
The Levoit Air Purifier for Home Pets Hair is the best portable HEPA air purifier for most bedrooms because it combines AHAM verification, a 143 CFM CADR, 24 dB Sleep Mode and a 7.9 lb body. Choose PureZone Mini instead when cordless personal use matters more than room coverage.
Are portable HEPA air purifiers effective?
Portable HEPA air purifiers can reduce airborne particles when their airflow matches the room and the filter is installed correctly. Use the stated room guidance as a starting point, keep the intake and outlet clear, and run the unit for enough time to circulate the room air.
Can you move an air purifier from room to room?
Yes. Lightweight models such as the 2.2 lb Levoit Core Mini-P, 1.8 lb TDBYWAE and 9.6 oz PureZone Mini are easier to move between occupied spaces.
Check the power setup first, since some portable air purifiers need an outlet or Type-C power source.
What should I look for in a portable HEPA air purifier?
Look for a clear filter type, room coverage or CADR, a size you can carry, and a power setup that fits your routine. Sleep noise, filter alerts, washable pre-filters and air quality sensors can matter more than extra modes when the purifier will run every day.
