| 摘要 |
1504842 Gas filter CARL FREUDENBERG 15 Sept 1976 [25 Sept 1975] 38269/76 Heading BIT A gas filter assembly comprises a replaceable filter element having a filter batt formed into a number of pockets 2 into each of which at least one four sided reinforcing insert 3 is fixed by fusion, and a square front supporting frame 1 fixed detachably or permanently to the open end or ends of the pocket or pockets; at least two similar smaller filter elements each of which have a supporting frame extending over an area substantially equal to a quarter of that of the first said element; and connecting means 6 for connecting the smaller filter elements together to form a dust tight seal between them, The assembly of one large and a plurality of smaller elements may be assembled to cover rectangular openings, for example in a ventilating duct, with a desired alignment of the long sides of the pockets which is not dependent on the alignment of the opening. |
