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Air purifiers ยท Rainbow

Rainbow Brisk Box Ultra air purifier

Rated for rooms up to 574 sq ft. Puts out 370 cfm of smoke-free air per minute.

Where it ranks

#5 in Best air purifiers rated most efficient65 models compared#2 in Best air purifiers for allergies206 models compared#2 in Best low-energy air purifiers for rooms over 500 sq ft35 models compared

Full specs

Cleaning power

Room size it is rated forThe largest room it cleans well in the certification test.574 sq ft
Clean air per minute: smokeHow much smoke-free air it puts out each minute. Higher cleans faster.370 cfm
Clean air per minute: dustThe same test for dust.441 cfm
Clean air per minute: pollenThe same test for pollen. Matters most for allergies.450 cfm

Running cost

Electricity per yearMeasured use when running all year. Multiply by your power price.94 kWh
Among the most efficient of 2025Yes

Filters

Main filterHEPA

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.No
App controlNo

Source: this model on the ENERGY STAR list, checked 2026-11-09. Model number Brisk Box Ultra.