Alen BreatheSmart FLEX True HEPA-Pure Filter: B4-Pure / FL40-Pure Filter:HEPA-Pure the Alen T500 is 63%

the Alen T500 is 63% more effective

BreatheSmart FIT50 thinks about air quality so you don't have to

featuring intuitive controls and easy filter changes that will give you peace of mind

Polluted air first passes through Alen'sreplaceable Pre-Filter to capture large particles

SleepScore Validated: Proven to improve sleep by reducing allergy symptoms

Alen BreatheSmart FLEX True HEPA-Pure Filter: B4-Pure / FL40-Pure Filter:HEPA-Pure the Alen T500 is 63%Polluted air first passes through Alen's replaceable Pre Filter to capture large particles, extending the life of the filter. In the second layer, air moves through True HEPA material that attracts and captures dust, pollen, pet dander, mold spores and other airborne pollutants. Alen then adds an antimicrobial compound to the HEPA type material, protecting the filter from harmful bacteria* and microbe growth. Relief from allergy and asthma symptoms