Automatic sensing. Dyson Purifier Hot+Cool HP1 Purifying fan heater (White). Fully-sealed to HEPA H13 standard. So what goes inside the machine, stays inside.5. 5 Tested to JEM 1467 (acetic acid, acetaldehyde, ammonia), GB/T18801-2022 (formaldehyde, benzene) and DTM-003282 (NO2).
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