QT3 E11 Filter (2 pack) – Smart Air聪明空气

Q: Can I wash a dirty HEPA/EPA filter?

Unfortunately not. We ran experiments to test this and found that washing HEPA/EPA filters does not prolong their lifespan. In fact, washing HEPA/EPA filters with water actually decreases performance. That’s why we recommend you replace your HEPA/EPA filter after the maximum hours of use.

Rating based on real customers reviews

QT3 E11 Filter

Replacement HEPA filter (2 pack) for the QT3 portable air purifier.

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Up to 800 Hours of Protection

Each filter delivers up to 800 hours of effective filtration before replacement, providing months of clean air with minimal maintenance.

Why QT3?

The QT3 is designed to give you personal clean air anywhere—at your desk, bedside, during travel, or in shared spaces. Unlike typical fans or “air gadgets,” it uses a true HEPA filter to capture harmful particles like dust, allergens, pollen, smoke, and viruses, instead of just moving air around.

Lightweight and Portable

Weighs only 720g and fits easily inside a backpack or carry bag.

Up to 800 Hours Per Filter

Larger filter design delivers better airflow and up to 800 hours of use before replacement.

Long Battery Life

Enjoy up to 4 hours of clean air on a single charge.

Personal Clean Air Companion

Portable clean air wherever you go — at work, school, on public transport, or while traveling.

Equipped with an E11 air filter capturing over 95% of viruses, bacteria, PM2.5, and other harmful pollutants in one pass.

Say Bye to Pollutants

PM2.5 (Fine Particles)

Captures fine airborne particles like dust, smoke, and pollution that can affect daily breathing comfort.

Dust

Everyday household particles made of skin cells, fibers, and debris. The purifier helps reduce airborne dust before it settles on surfaces.

Allergens

Triggers like pet dander, dust mite particles, and other irritants that can cause sneezing, watery eyes, or breathing discomfort.

Pollen

Outdoor particles that easily enter your home through windows and clothing. The purifier helps reduce pollen exposure indoors, especially during allergy season.

Mold Spores

Microscopic spores released by mold in damp environments. Removing them from the air helps reduce musty odors and supports a healthier breathing environment.

A Clean Air Social Enterprise You Can Trust

We believe clean air should be safe, simple, and honest. That’s why we focus on proven filtration — not gimmicks. No harmful ionizers, no UV light, and no unreliable built-in air quality monitors. Just effective, tested purification designed for everyday peace of mind.

EMC Certified

Ensures safe electromagnetic performance without interfering with other devices.

RoHS Certified

Confirms restricted use of hazardous substances for safer everyday use.

CE Certified

Meets essential European safety, health, and environmental protection standards.

C-mark Certified

Verified for compliance with required product safety and quality standards.

GB 4706.1-2005 Certified

Meets national safety standards for household and electrical appliances

GB 4706.27-2008 Certified

Certified for safety requirements specific to air-cleaning appliances.

Technical Specifications

Product Name

QT3 EPA Filters

Lifespan

Approx. 800 hours

Filter Grade

E11, 95%

Dimensions (L x W x H)

Single Filter: 118 x 112 x 88mm

Net Weight

0.5kg

Frequently Asked Questions

Can I wash a dirty HEPA/EPA filter?

Unfortunately not. We ran experiments to test this and found that washing HEPA/EPA filters does not prolong their lifespan. In fact, washing HEPA/EPA filters with water actually decreases performance. That’s why we recommend you replace your HEPA/EPA filter after the maximum hours of use.

How often should I change my QT3 E11 filter?

We recommend changing the filter after 800 hours of use. The QT3 has a built-in feature to remind you when 800 hours of use have passed.

Are HEPA/EPA filters effective against COVID?

A common concern is whether HEPA/EPA filters can filter viruses like the COVID-19 coronavirus. HEPA/EPA filters removes particles greater than or equal to 0.3 microns, but virus particles are smaller. The coronavirus measures 0.06 to 0.14 microns in diameter. HEPA/EPA filters work great at capturing viruses. This is because a HEPA/EPA filter works not like a net, but through a process called diffusion. Learn more about how this works here.