公开(公告)号：US3540526A

公开(公告)日：1970-11-17

申请号：US3540526D

申请日：1968-08-02

Applicant: ITT

Inventor： HOAGLUND JAMES B ,  KAUTZ FRANZ A ,  STORY GEORGE A

IPC: F24F3/00 ,  F24F11/08 ,  G05D23/24

CPC classification number: G05D23/24 ,  F24F3/00 ,  F24F11/30 ,  G05D23/1906 ,  G05D23/1912

Abstract: 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.