Air duct

Details Air duct Air duct

1990-06-01

1992-03-31

Joyce, Harold

Ventilation

Having inlet airway

Including specific air distributor

454323, F24F 13068

Patent

active

050997548

ABSTRACT:
An air duct has a perforated jacket (1) and a base (3) with air-outlet openings (3a) that can be closed off. One or more annular diaphragms (5 or 18a & 18b) travel up and down or rotate or travel up and down and rotate inside the jacket.

REFERENCES:
patent: 1319526 (1919-10-01), Hauser
patent: 2466851 (1949-04-01), Hunerkamp et al.
patent: 3537380 (1970-11-01), Spradling et al.
patent: 4181253 (1980-01-01), Barlow

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