Method of retrofitting ventilation systems with security grilles

Details Method of retrofitting ventilation systems with security grilles Method of retrofitting ventilation systems with security grilles

1998-05-28

2000-09-05

Joyce, Harold

Ventilation

Having inlet airway

Including specific cover or shield for exterior vent opening

454277, F24F 1320

Patent

active

061134880

ABSTRACT:
A method of retrofitting ventilation systems with security grilles. A first step involves providing a security grille that is larger in size than an existing air duct to be covered by the security grille. The security grille has a flow area sufficient to permit a desired number of air exchanges per hour within a holding cell. A second step involves forming an enlarged plenum chamber where the existing air duct passes through a wall into the holding cell. The plenum chamber has a flow area compatible with the security grille. A third step involves attaching the security grille over the plenum chamber, such that the security grille is fed by a flow of air through the plenum chamber.

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patent: 1442588 (1923-01-01), Tompkins
patent: 1650569 (1927-11-01), Nickle
patent: 2790376 (1957-04-01), Kennedy et al.
patent: 2848936 (1958-08-01), Vallero
patent: 3124903 (1964-03-01), Truhan
patent: 3502016 (1970-03-01), Steele
patent: 4512241 (1985-04-01), Morris et al.
patent: 4911066 (1990-03-01), Carew

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