PURPOSE: To efficiently obtain O2-enriched clean air by using a dust collection filter, a deodorization filter, a cassette of an aromatic, a cassette of a CO2 adsorbent and a cassette of an N2 adsorbent and allowing air to pass through these with a fan.

CONSTITUTION: A dust collection filter, a deodorization filter, a cassette 2 of an aromatic, a cassette 3 of a CO2 adsorbent and a cassette 4 of an N2 adsorbent are fitted to the inside of an equipment 1 and air is passed through respective cassettes with a fan 5 and thereby cleaned O2-enriched air is discharged into a room 7. This equipment 1 is built in a bed and used.