HOTHOUSE AIR DUCT Russian patent published in 1994 - IPC

FIELD: agriculture; heating and ventilation of hothouses, growing of plants on sheltered ground. SUBSTANCE: air duct has film hose 1 secured on frame made up of three rigid longitudinal ribs 2, 3 and 4, two of which are coupled with framework of hothouse 8 by braces 9. Rib 4 is made sectional to form ventilating clearance. Air duct can be used both for taking air out of hothouse and for delivering air into hothouse. In the first case, owing to rigid ribs 2, 3, 4 and braces 9, slinging of walls of hose 1 together is prevented. EFFECT: enlarged operating capabilities. 1 dwg