| 摘要 |
<p>1280686 Air conditioning plant ITT INDUSTRIES Inc 29 July 1969 [2 Aug 1968] 38024/69 Heading B1T [Also in Divisions F4 and F3] In an air conditioning plant, a filter unit comprises fibre glass or dense foam filter mats 47 or a filter blanket passed between rollers. A warning light is actuated when the set of filter mats or the filter roll requires replacement in response respectively to a device for measuring the pressure difference between opposite sides of the mats and to a limit switch actuated near the end of the roll. A fan 53 draws air through the filter unit.</p> |
