Ninjasmart Apollo 818 Air Purifier (White, 1500 Sq Ft Coverage)

How often should I replace the filters?

The H13 HEPA and carbon filters typically need replacement every 6-8 months depending on usage and air quality conditions. The washable pre-filter should be cleaned monthly and can be reused indefinitely. The unit includes a filter replacement indicator that alerts you when filters need changing. Genuine replacement filters are available on Amazon using ASIN B09PCBXRXM.

What room sizes work best with this air purifier?

The Apollo 818 is designed for rooms up to 1500 square feet, making it suitable for large living rooms, open-plan spaces, or multiple connected rooms. For optimal performance, it cleans 750 square feet in 30 minutes and 1500 square feet in one hour. Smaller rooms will experience faster air turnover and more frequent cleaning cycles.

How does the automatic mode actually work?

The built-in PM2.5 sensor continuously monitors particulate matter in the air and adjusts fan speeds accordingly. When pollution levels are high, the unit increases to maximum speed and the LED ring shows red. As air quality improves, the fan speed reduces and the LED transitions through orange, yellow and finally blue for clean air. This happens automatically without any user input required.

Is this air purifier really quiet enough for bedrooms?

Yes, the Apollo 818 operates at just 20 decibels on sleep mode, which is quieter than a whisper or rustling leaves. The advanced DC motor and aerodynamic design minimise noise whilst maintaining effective air circulation. Sleep mode also dims all LED lights, creating an ideal environment for undisturbed rest whilst continuously purifying bedroom air.

What specific pollutants does this unit remove?

The four-stage filtration system removes dust, pollen, smoke, pet dander, cooking odours, wildfire smoke and volatile organic compounds (VOCs). The H13 HEPA filter captures 99.97% of particles down to 0.3 microns, including bacteria and some viruses. The activated carbon layer absorbs odours and chemical vapours, whilst the cold catalyst filter breaks down harmful gases.

Can I wash any of the filters to save money?

Only the pre-filter is washable and reusable. This outer filter captures larger particles like hair and dust, extending the life of the internal filters. Wash it monthly with water, allow to dry completely, then reinstall. The H13 HEPA and carbon filters cannot be washed as this would damage their filtration structure and reduce effectiveness.

Does this air purifier produce any ozone?

No, the Apollo 818 is certified as 100% ozone-free. Unlike some air purifiers that use ionisation or UV-C technology, this unit relies solely on mechanical filtration and activated carbon absorption. This makes it safe for continuous operation around children, elderly people and those with respiratory conditions like asthma or COPD.

What warranty and support comes with this air purifier?

Ninjasmart provides a 2-year warranty registered in the USA, covering manufacturing defects and component failures. The company offers lifetime customer service support and maintains an online community of over 100,000 users for troubleshooting and tips. The unit is Energy Star certified, FCC certified, ETL listed and CARB certified for safety and performance standards.