with air supply, or exhaust, through perforated wall, floor or ceiling

Full Title

Ventilation > with ducting systems > with forced air circulation, e.g. by fan > with air supply, or exhaust, through perforated wall, floor or ceiling

Classification Context

Section:

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

Class:

HEATING; RANGES; VENTILATING

Subclass:

AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING