EXHAUST VENTILATOR

摘要

1393991 Kitchen hood air flow control units GLENT & CO AS 10 May 1972 [11 May 1971] 21724/72 Heading F4V An air exhaust control device for a kitchen hood having a perforate plate 3 comprises a frusto-conical member 4 which is axially displaceable between positions in which it contacts an inlet portion 2 of a duct 1 and a fixed member 5 disposed coaxially with respect to portion 2. The ratio of the airflow areas in the two end positions is approximately 5 : 1. The position of member 5 relative to portion 2 may be adjusted.