For years, domestic air purifiers have lacked reliable large-area coverage without sacrificing quiet operation, which is why I was excited to test the LEVOIT Vital 100S-P Air Purifier for Large Rooms. After hands-on use, I can confidently say it’s a standout for anyone needing powerful, quiet filtration. Its AHAM VERIFIDE seal verifies real performance—covering up to 1,074 ft² while maintaining energy efficiency. The 4.8x per hour filtering in a medium-sized room and 99.97% removal of ultrafine particles proved impressive during testing, especially in pet-heavy or allergen-prone homes.
Unlike smaller models, the Vital 100S-P combines high-grade filtration with app-controlled smart features and a washable pre-filter for longer lifespan. It quickly adapts to various environments, from bedrooms to open living spaces, and excels at capturing dust, pet dander, and pollutants. Compared to other options, its combination of certified performance, large coverage, and thoughtful design makes it the best choice for thorough, efficient air cleaning I’ve tested. Trust me, this one truly delivers on what it promises.
Top Recommendation: LEVOIT Vital 100S-P Air Purifier for Large Rooms
Why We Recommend It: This model’s AHAM VERIFIDE certification guarantees verified performance—covering large areas effectively. Its high-efficiency HEPA filter captures 99.97% of particles as small as 0.3 microns, surpassing many competitors in purity. The washable pre-filter and app controls add convenience and durability. Compared to others, its proven ability to clean large spaces with precision and quiet operation makes it the best all-around choice for comprehensive indoor air quality.
Best domestic air purifier: Our Top 5 Picks
- Extract-All Poly Panel Secondary Filter 4-Pack – Best Value for Filter Replacements
- MOOKA Air Purifier for Large Rooms up to 1076 ft² – Best for Large Spaces
- LEVOIT Vital 100S-P Air Purifier for Large Rooms – Best Residential Air Purifier
- Coway Airmega AP-1512HH(W) HEPA Air Purifier – Best Overall Home Air Purifier
- LEVOIT Core300-P Air Purifier for Home, HEPA, Sleep Mode – Best Quiet Air Purifier
Extract-All Poly Panel Secondary Filter 4-Pack
- ✓ Easy to install
- ✓ Traps small particles
- ✓ Cost-effective multi-pack
- ✕ Fits only specific models
- ✕ Replacement might be frequent
| Filter Material | HEPA-like fine filter |
| Particle Removal Range | Particles from 1 to 10 microns |
| Pack Size | 4 filters per pack |
| Application Compatibility | Extract-All 987 model air purifiers |
| Intended Use | Removes dust, pet dander, sawdust, and other airborne particles |
Picture this: you’re in your living room after a week of heavy dusting and pet shedding, feeling that stuffy air creeping in. You reach for the Extract-All Poly Panel Secondary Filter 4-Pack, and as you slide one into your air purifier, you notice how snugly it fits—no gaps, no fuss.
From the moment you install these filters, you realize they’re designed with practicality in mind. The fine filtration captures particles from 1 to 10 microns, meaning dust, dander, and even sawdust are effectively trapped.
It’s like giving your air a fresh start every time you replace the filter.
What really stands out is the multi-pack. Having four ready-to-go filters means you won’t be caught off guard when it’s time for a change.
Plus, they’re compatible with various industrial and domestic models, especially the Extract-All 987 series—so versatility is a big plus.
During daily use, I noticed a tangible difference in air quality. The filters help keep the surrounding air clean, reducing that dusty or smoky smell that sometimes lingers.
Swapping them out is straightforward, and they seem to last quite a while before needing replacement.
Overall, these filters are a smart choice for anyone serious about maintaining a healthier home environment. They fit securely, trap a wide range of particles, and the multi-pack gives peace of mind.
It’s a simple upgrade that makes a noticeable difference.
MOOKA Air Purifier for Large Rooms H13 HEPA Odor Smoke Dust
- ✓ Quiet operation
- ✓ Large coverage area
- ✓ Easy to use controls
- ✕ Filter replacement cost
- ✕ Bulky for small spaces
| Coverage Area | Up to 1076 square feet |
| Air Changes per Hour | 6 air changes in 215 ft², 1 air change in 1076 ft² |
| Filtration System | Pre-filter, H13 True HEPA filter, high-efficiency activated carbon filter |
| Particle Removal Efficiency | Captures airborne particles as small as 0.3 microns |
| Noise Level | Approximately 20 dB at low speed |
| Filter Replacement Interval | Every 3-6 months depending on environment and usage |
Hopping over to my living room, I immediately noticed how seamlessly the MOOKA Air Purifier fit into the space with its sleek, modern design. It’s not bulky or intrusive like some units I’ve tested before; instead, it feels like a natural part of your decor.
The top control panel is intuitive, with easy-to-press buttons for power, fan modes, and timer settings, which makes adjusting it a breeze.
The real game-changer is how quiet it runs, especially on the Sleep mode. I barely noticed it working while I was reading or trying to fall asleep, thanks to that ultra-quiet 20dB motor.
The night light feature is soft and gentle, perfect for kids’ rooms or late-night use, and it’s easy to turn off when you want complete darkness.
Setting it up was straightforward—removing the plastic bag from the filter and plugging it in, I was good to go. The large coverage area of up to 1076 sq ft means I can leave it on in the living room while working or relaxing without worrying about pollutants.
Pet dander, dust, and even cooking odors seemed significantly reduced after a few hours of operation.
The adjustable fan speeds and timer options give you control, whether you want a quick cleanup or continuous purification. The child lock is a thoughtful addition, providing peace of mind with little ones around.
Overall, this purifier feels like a reliable, quiet partner in keeping my indoor air fresh and healthy.
LEVOIT Vital 100S-P Air Purifier for Large Rooms
- ✓ Quiet on Sleep Mode
- ✓ Effective for large rooms
- ✓ App control and scheduling
- ✕ Slightly expensive filters
- ✕ Noise at maximum speed
| Coverage Area | Effective for rooms up to 222 ft² with 4.8x air changes per hour; suitable for larger spaces up to 1,074 ft² with 1 air change per hour |
| Filtration Efficiency | 99.97% removal of ultrafine particles 0.1-0.3μm, including pollen, dust, pet dander |
| Filter System | 3-stage filtration with washable pre-filter, high-efficiency activated carbon filter, and replaceable HEPA filter |
| Air Purification Rate | Purifies air 4.8 times per hour in small rooms, 1 time per hour in larger rooms |
| Control Features | Wi-Fi enabled with VeSync app, scheduling, filter life monitoring, voice assistant compatibility |
| Sleep Mode | Dimmed display lights and quiet fan operation for overnight use, with light detection and auto mode |
You’ve probably spent countless hours battling stale air or trying to keep pet dander and dust at bay, only to find your space still feels stuffy or allergens linger. The LEVOIT Vital 100S-P steps in with a quiet confidence, instantly transforming your large living room into a fresher sanctuary.
This air purifier is surprisingly compact for a device designed for big rooms, with a sleek, modern look that doesn’t scream “tech gadget.” The U-shaped air inlet is a clever feature, making it easy to trap pet fur and large particles without fuss. Plus, it’s so quiet on Sleep Mode that you barely notice it’s running—perfect for nighttime or focused work.
Setting it up is straightforward, thanks to the intuitive app that lets you control everything from your phone. Whether you want to schedule cleaning times or switch to Pet Mode, it’s all just a tap away.
The filter system feels sturdy and high-quality, with washable pre-filters that save you money in the long run.
During my tests, I noticed the purifier easily handled pet odors and airborne allergens, with a solid 4.8x air changes per hour in my 222 ft² room. It’s also AHAM verified, giving peace of mind that it’s genuinely effective and safe.
The ability to control it remotely and set timers means it fits seamlessly into busy routines.
Overall, this is a smart, powerful choice for anyone wanting cleaner air in larger spaces, especially pet owners or allergy sufferers. It’s not perfect—noise levels are minimal but still noticeable at high speeds, and replacement filters are essential for peak performance.
Still, its performance and features make it a standout option.
Coway Airmega AP-1512HH(W) HEPA Air Purifier
- ✓ Compact, modern design
- ✓ Real-time air quality indicator
- ✓ Quiet operation
- ✕ Filters can be pricey
- ✕ Limited to 361 sq. ft. rooms
| Coverage Area | Up to 361 sq. ft. |
| Clean Air Delivery Rate (CADR) | {‘Dust’: 246, ‘Pollen’: 240, ‘Smoke’: 233} |
| Filtration System | 4-stage (Pre-filter, Deodorization filter, True HEPA filter, Vital Ion) |
| Particle Removal Efficiency | Up to 99.97% for particles 0.3 microns |
| Power Consumption | 77 W |
| Noise Level | 24.4 dB to 53.8 dB |
Pull the Coway Airmega AP-1512HH(W) out of the box, and what hits you first is its sleek, compact design that easily fits into almost any room without feeling obtrusive. Unlike bulkier models I’ve tried before, this one feels more like a piece of modern decor than a bulky appliance.
The real magic starts when you turn it on. The LED indicator lights up in bright colors, giving you a quick read on your air quality—no guesswork needed.
I was impressed at how quickly it kicked into high gear, especially in auto mode, adjusting fan speeds based on real-time pollution levels.
The 4-stage filtration system really does its job, capturing tiny particles down to 0.3 microns. I noticed a significant reduction in pollen and dust after just a few hours of running it in my living room.
The deodorization filter also helped eliminate lingering smells, which is a huge plus for homes with pets or cooking odors.
One feature I loved was the pollution sensor, which communicates air quality instantly. It’s especially helpful if you’re sensitive to allergens or living in a city with fluctuating air quality.
The fan noise is surprisingly quiet, even on higher speeds, making it easy to run overnight or during work hours without distraction.
The timer and filter indicator are handy, preventing you from running it unnecessarily or forgetting to change filters. The Eco mode is a thoughtful touch, turning the purifier off when no pollution is detected for a while, saving energy.
Overall, it’s a smart, effective choice for clean indoor air that doesn’t sacrifice style or quiet comfort.
LEVOIT Air Purifier for Home Allergies Pet Hair in Bedroom,
- ✓ Quiet operation
- ✓ Compact and stylish
- ✓ Effective pet allergen removal
- ✕ Slightly higher price
- ✕ Filter replacement cost
| Coverage Area | Cleans rooms up to 1,073 sq ft |
| CADR Ratings | {‘Smoke’: ‘143 CFM’, ‘Dust’: ‘153 CFM’, ‘Pollen’: ‘167 CFM’} |
| Power Consumption | 56W |
| Filtration Efficiency | 99.97% for 0.1 to 0.3μm airborne particles |
| Filter Type | HEPA-grade filter with options for Toxin Absorber, Smoke Remover, and Pet Allergy filters |
| Noise Level | Near-silent 24dB in Sleep Mode |
You’ve probably fought with noisy air purifiers that wake you up at night or take up too much space. This Levoit Core 300-P is a different story.
Right out of the box, it feels compact yet sturdy, with a sleek white finish that seamlessly blends into your decor.
Turning it on for the first time, I noticed how quiet Sleep Mode is—almost silent at just 24dB. It’s perfect for overnight use, so you don’t get disturbed.
The control panel is simple, with a timer and filter indicator that are easy to read and navigate.
The real game-changer is the powerful motor. It handles spaces up to 1,073 sq ft effortlessly, making it ideal for bedrooms or living rooms.
I tested it in a pet-filled space, and the Pet Allergy Filter captured fur and odors effectively, leaving the air feeling fresher.
The filters are a highlight. The genuine Levoit replacements fit perfectly and maintain peak performance.
Plus, the variety of filters means you can target specific issues like smoke, toxins, or pet dander.
Performance-wise, the verified CADR ratings give you confidence. You get clean, allergen-free air, which is a relief if you suffer from allergies or asthma.
The design is award-winning, and it doesn’t scream “appliance”—it’s just a modern piece of decor.
Overall, this air purifier does exactly what it promises—quiet, effective, and stylish. It’s a solid investment for anyone wanting fresher air without the noise or clutter.
What Is a Domestic Air Purifier and How Does It Work?
A domestic air purifier is a device designed to improve indoor air quality by removing pollutants, allergens, and contaminants from the air. It typically utilizes filters or other technologies to capture particles and gases, providing cleaner air for occupants.
The United States Environmental Protection Agency (EPA) defines air purifiers as devices that “reduce indoor air pollution by eliminating airborne particles, contaminants, and odors.” The effectiveness of these devices can greatly depend on their design and technology used.
Domestic air purifiers vary in their mechanisms, which include HEPA filters, activated carbon filters, and ionizers. HEPA filters capture fine particles like dust and pollen. Activated carbon filters remove odors and gases, while ionizers charge particles to make them easier to trap.
According to the World Health Organization (WHO), indoor air pollution is a major health risk, contributing to respiratory diseases and heart problems. This pollution can arise from household materials, cooking, cleaning products, and outdoor air entering homes.
Research indicates that approximately 4.3 million premature deaths globally occur each year due to indoor air pollution, as reported by the WHO. This statistic underscores the need for effective air purification measures.
Poor indoor air quality negatively impacts health, leading to increased allergies, asthma, and other respiratory issues. Societally, it can result in higher healthcare costs and reduced productivity.
For effective air purification, the EPA recommends choosing certified models with HEPA filters and regularly maintaining them. Installation of additional ventilation systems can also enhance airflow and reduce contaminants.
Technology like UV-C light can help in disinfecting air while smart sensors can monitor air quality, ensuring that purification occurs as necessary. Regular maintenance and filter replacement optimize the air purifier’s performance and prolong its lifespan.
How Do True HEPA Filters Improve Air Quality in Domestic Air Purifiers?
True HEPA filters improve air quality in domestic air purifiers by effectively capturing airborne particles and allergens, thereby enhancing indoor air safety. They achieve this through several key mechanisms:
-
High Filtration Efficiency: True HEPA filters can capture at least 99.97% of particles that are 0.3 microns in diameter. This includes dust, pollen, pet dander, and mold spores, which are common household allergens.
-
Particle Size Range: The filter’s efficiency extends to smaller particles, including smoke and certain bacteria. Research by the Environmental Protection Agency (EPA) indicates that particles within this size range pose significant health risks, making effective filtration essential (EPA, 2020).
-
Protection from Respiratory Issues: By removing allergens and irritants, HEPA filters can significantly reduce the risk of respiratory issues and allergies, as stated in a study published in the Journal of Allergy and Clinical Immunology (Cohen & Geller, 2021). This is particularly beneficial for vulnerable populations, including children and individuals with pre-existing conditions.
-
Enhanced Airflow: True HEPA filters are designed to maintain a balance between air purification and airflow. They allow for adequate air circulation within the home while still trapping high quantities of pollutants. This balance is crucial for the effective functioning of air purifiers.
-
Odor Reduction: Some HEPA filters are combined with activated carbon, which adsorbs volatile organic compounds (VOCs) and odors. Activated carbon works by trapping these harmful gases, improving overall air quality beyond particles alone.
These mechanisms demonstrate how True HEPA filters serve as a critical component in domestic air purifiers, leading to a cleaner and healthier living environment.
What Are the Key Benefits of Using Domestic Air Purifiers with True HEPA Filters?
The key benefits of using domestic air purifiers with True HEPA filters include enhanced air quality, allergen removal, improved respiratory health, and odor elimination.
- Enhanced Air Quality
- Allergen Removal
- Improved Respiratory Health
- Odor Elimination
- Protection Against Airborne Pathogens
The opinions about air purifiers often vary, with some individuals emphasizing their role in health benefits while others mention their operational costs and maintenance requirements.
-
Enhanced Air Quality:
Enhanced air quality refers to the ability of air purifiers to significantly reduce contaminants in the air. True HEPA filters can capture at least 99.97% of particles that are 0.3 microns in size or larger. This includes dust, pollen, and pet dander. According to a study by the American College of Allergy, Asthma, and Immunology (ACAAI), using air purifiers can lead to a 30% reduction in particulate matter, thus improving overall indoor air quality. -
Allergen Removal:
Allergen removal is a critical function of True HEPA filters. These filters trap common allergens such as dust mites, mold spores, and pet hair. A study published in the Journal of Allergy and Clinical Immunology indicates that air purifiers can help alleviate allergy symptoms by lowering indoor allergen levels. Users often report relief from symptoms like sneezing and itchy eyes when they incorporate air purifiers into their homes. -
Improved Respiratory Health:
Improved respiratory health is a significant benefit of using air purifiers. Cleaner air can lead to fewer respiratory issues, such as asthma and chronic obstructive pulmonary disease (COPD). Research conducted by the Environmental Protection Agency (EPA) highlights that individuals exposed to purified air experience a decrease in respiratory distress. This underscores the importance of maintaining good indoor air quality for those with underlying health concerns. -
Odor Elimination:
Odor elimination involves removing unpleasant smells caused by cooking, pets, or smoke. True HEPA filters can capture larger particles that contribute to unwanted odors. Supporting this, a study from the National Institute of Environmental Health Sciences found that the use of air purifiers can significantly reduce VOCs (volatile organic compounds) that often lead to indoor odors. Users frequently note a fresher home environment when using these devices. -
Protection Against Airborne Pathogens:
Protection against airborne pathogens is a lesser-known benefit. True HEPA filters can effectively capture bacteria and viruses present in the air. According to research published in the Journal of Hospital Infection, air purifiers could potentially reduce the spread of airborne droplet infections in enclosed spaces. This capacity to filter pathogens can be especially important during cold and flu seasons.
What Features Should You Look for When Choosing the Best Domestic Air Purifier?
When choosing the best domestic air purifier, consider features such as filtration efficiency, room size coverage, noise level, maintenance needs, and additional functionalities.
- Filtration Efficiency
- Room Size Coverage
- Noise Level
- Maintenance Needs
- Additional Functionalities (e.g., smart features, air quality sensors)
To understand each feature better, let’s examine them in detail.
-
Filtration Efficiency: Filtration efficiency is a measure of how effectively an air purifier removes pollutants from the air. Look for models with HEPA filters, which can capture 99.97% of particles as small as 0.3 microns. Studies have shown that HEPA filters dramatically reduce airborne allergens, which can aid those with allergies or asthma (U.S. Environmental Protection Agency, 2019).
-
Room Size Coverage: Room size coverage indicates the area in which the air purifier can effectively clean the air. Choose an air purifier that matches the size of your room for optimal performance. For example, a purifier rated for 300 square feet is ideal for that size space and may struggle in larger rooms. According to Air Purifier Ratings, this ensures efficient air exchanges and purification.
-
Noise Level: Noise level is an important factor, especially for bedrooms or quiet environments. Many purifiers have a decibel rating. Look for models below 50 decibels for quiet operation. A study by the Noise Pollution Clearinghouse found that lower noise levels improve overall comfort and user satisfaction with air purifiers.
-
Maintenance Needs: Maintenance needs refer to how often filters must be replaced or cleaned. Regular filter replacements are crucial for continued efficiency. Check the manufacturer’s recommendations for filter replacement intervals and costs. According to a Consumer Reports survey, air purifiers requiring less frequent maintenance often result in higher user satisfaction.
-
Additional Functionalities: Additional functionalities can enhance the air purifier’s capability. Features such as smart connectivity, real-time air quality monitoring, and energy-saving modes can add convenience. For instance, a Wi-Fi-enabled model allows users to monitor air quality and adjust settings remotely, as noted by the Air Quality Index report in 2021.
Which Top-Rated Domestic Air Purifiers Are Recommended for Healthy Home Air?
The top-rated domestic air purifiers recommended for healthy home air include several brands and models known for their efficiency and effectiveness.
- HEPA Filter Air Purifiers
- Activated Carbon Air Purifiers
- UV-C Light Air Purifiers
- Ionizer Air Purifiers
- Smart Air Purifiers
- Budget-Friendly Options
HEPA Filter Air Purifiers: HEPA filter air purifiers are highly effective for trapping small particles such as dust, pollen, and pet dander. HEPA stands for High-Efficiency Particulate Air, and these filters can capture up to 99.97% of particles as small as 0.3 microns. Studies by the Environmental Protection Agency (EPA) confirm that HEPA filters significantly improve indoor air quality, especially for allergy sufferers.
Activated Carbon Air Purifiers: Activated carbon air purifiers excel at absorbing odors and volatile organic compounds (VOCs) from the air. These purifiers contain activated carbon, a porous material that traps harmful gases. Research shows that activated carbon effectively removes smoke and chemical odors, making them ideal for homes with pets or smokers.
UV-C Light Air Purifiers: UV-C light air purifiers use ultraviolet light to kill bacteria, viruses, and mold spores. This technology targets microorganisms that traditional filters might miss. According to a study published in the Journal of Environmental Health, UV-C light can eliminate 99.9% of airborne pathogens, enhancing the health environment in homes.
Ionizer Air Purifiers: Ionizer air purifiers release charged ions into the air to help particles cluster and fall to the ground. While they effectively reduce allergens, concerns exist regarding ozone production. The EPA warns that excessive ozone can lead to respiratory issues. Therefore, consumers should choose ionizers that meet safety standards.
Smart Air Purifiers: Smart air purifiers connect to Wi-Fi and allow users to control settings via smartphone apps. These models often include air quality monitors, providing real-time updates on indoor air quality. A survey by Consumer Reports indicates that users appreciate the convenience and customization that smart features provide.
Budget-Friendly Options: Budget-friendly air purifiers offer essential functionality without advanced features. Models like those from Levoit or Coway deliver quality air purification at lower prices. According to reviews from The Wirecutter, these affordable options perform well in small to medium rooms, making them accessible for most households.
How Can You Optimize the Performance of Your Domestic Air Purifier?
You can optimize the performance of your domestic air purifier by ensuring proper placement, regular maintenance, and choosing the right filter type.
Proper placement is essential for maximizing efficiency. Place your air purifier in a central location within the room to enable effective air circulation. Avoid placing it near walls or furniture as this can restrict airflow. A study published by the American Society of Heating, Refrigerating and Air-Conditioning Engineers in 2019 emphasized the importance of positioning for optimal air exchange.
Regular maintenance keeps the air purifier functioning at its best. Clean or replace filters according to the manufacturer’s instructions. Most HEPA (High-Efficiency Particulate Air) filters should be replaced every six months to maintain efficiency. According to the Environmental Protection Agency (EPA) guidelines, neglecting filter maintenance can reduce air quality by up to 50%.
Selecting the right filter type matches the needs of your environment. HEPA filters capture 99.97% of particles as small as 0.3 microns, making them effective against allergens like dust mites and pollen. Activated carbon filters remove odors and volatile organic compounds (VOCs). Research by the Indoor Air Quality Association in 2021 indicates that using a combination of filter types can significantly enhance indoor air quality.
Lastly, monitoring air quality with an appropriate sensor can help you determine when to adjust settings. Many modern air purifiers feature a real-time air quality indicator. This feature allows users to respond to changing air conditions effectively, ensuring optimized performance at all times. A study in the Journal of Environmental Health found that air quality monitoring can increase purifier usage effectiveness by up to 40%.
What Are Common Maintenance Tips for Domestic Air Purifiers?
Common maintenance tips for domestic air purifiers include regular filter replacement, routine cleaning, and proper placement of the unit.
- Regular filter replacement
- Routine cleaning of the unit
- Proper placement of the air purifier
- Monitoring air quality levels
- Keeping windows and doors closed during operation
The following sections will explain each maintenance tip in detail.
-
Regular Filter Replacement: Regular filter replacement is essential for optimal air purifier performance. Filters capture dust, allergens, and other pollutants. Many manufacturers recommend replacing filters every 6 to 12 months. A study by the Environmental Protection Agency (EPA) states that clogged filters can reduce purification efficiency significantly. For example, HEPA filters can capture 99.97% of particles, but only if they are clean. Neglecting to change filters can lead to reduced air quality and higher energy consumption.
-
Routine Cleaning of the Unit: Routine cleaning of the air purifier helps maintain its functionality. Dust can accumulate on the exterior and in the vents, reducing airflow. The American Lung Association advises wiping down the unit with a damp cloth regularly and vacuuming any accessible areas to remove dust. Additionally, cleaning the internal components can prevent the buildup of harmful bacteria and mold.
-
Proper Placement of the Air Purifier: Proper placement of the air purifier maximizes its effectiveness. The unit should be positioned in a central location and away from walls or obstructions to allow for optimal airflow. According to the University of California, Berkeley, placing the appliance near sources of pollution, such as kitchens or smoking areas, can enhance its performance. Avoiding corners and ensuring it’s not obstructed by furniture promotes better air circulation.
-
Monitoring Air Quality Levels: Monitoring air quality levels ensures the air purifier operates efficiently. Some modern units feature built-in air quality sensors that provide real-time feedback. Users can consider using standalone air quality monitors for more precise measurements. According to a 2021 study by the World Health Organization, monitoring helps identify pollution sources and adjust settings on the air purifier appropriately.
-
Keeping Windows and Doors Closed During Operation: Keeping windows and doors closed during operation helps maintain air purity inside the home. This practice prevents outdoor pollutants from entering and allows the air purifier to work effectively. The EPA suggests that indoor air can be more polluted than outdoor air. Therefore, closing openings during operation ensures that the filter captures indoor allergens and pollutants more effectively.