| 摘要 |
1,197,029. Ventilating buildings. MODINE MFG. CO. 13 Nov., 1968 [1 March, 1968], No. 53767/68. Heading F4V. A ventilation system for a greenhouse comprises a mixing chamber 16 having a fresh air inlet controlled by shutters 22 and a recirculation air inlet 24, an air inlet duct, which may be flexible, depending from the inlet 24, a fan 25, a gas fired air heater 28 and an inflatable plastics distributing duct 31 having rows of outlet apertures in its lower quadrants. The shutters 22 are adjusted by a motor 23. An opening 46 controlled by a damper 47 permits entry of combustion products, including CO 2 , from a heater flue 29 to the greenhouse. |
