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Air purifiers ยท Coway

Coway Airmega 300 air purifier

Rated for rooms up to 488 sq ft. Puts out 315 cfm of smoke-free air per minute.

Where it ranks

#3 in Best air purifiers for rooms of 300 to 500 sq ft56 models compared#5 in Best air purifiers for allergies in rooms of 300 to 500 sq ft56 models compared#2 in Best air purifiers for dust in rooms of 300 to 500 sq ft56 models compared

Full specs

Cleaning power

Room size it is rated forThe largest room it cleans well in the certification test.488 sq ft
Clean air per minute: smokeHow much smoke-free air it puts out each minute. Higher cleans faster.315 cfm
Clean air per minute: dustThe same test for dust.333 cfm
Clean air per minute: pollenThe same test for pollen. Matters most for allergies.360 cfm

Running cost

Electricity per yearMeasured use when running all year. Multiply by your power price.314 kWh
Among the most efficient of 2025No

Filters

Main filterComposite Filter
Replacement filterThe part number to buy when the filter wears out.1230060
Second filterComposite Filter

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 AP-1515H.