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Air purifiers ยท Alen

Alen BreatheSmart 35i air purifier

Rated for rooms up to 233 sq ft. Puts out 150 cfm of smoke-free air per minute.

Where it ranks

#7 in Best air purifiers for rooms up to 300 sq ft with app control29 models compared#3 in Best air purifiers for allergies in rooms up to 300 sq ft with app control29 models compared

Full specs

Cleaning power

Room size it is rated forThe largest room it cleans well in the certification test.233 sq ft
Clean air per minute: smokeHow much smoke-free air it puts out each minute. Higher cleans faster.150 cfm
Clean air per minute: dustThe same test for dust.164 cfm
Clean air per minute: pollenThe same test for pollen. Matters most for allergies.195 cfm

Running cost

Electricity per yearMeasured use when running all year. Multiply by your power price.136 kWh
Among the most efficient of 2025No

Filters

Main filterHEPA-Type

Safety

Ozone it gives offOzone irritates lungs. 0 means none was measured.0 ppb

Features

Automatic modeAn air quality sensor adjusts the speed on its own.Air Quality Sensor
App controlYes

Source: this model on the ENERGY STAR list, checked 2026-11-09. Model number BreatheSmart 35i.