| 摘要 |
The invention relates to a filter device of tubular bag type for mounting in short inlet pipe sockets (11) to ventilation ducts (10). In order to obtain a filter with a sufficiently effective length this is, according to the invention, comprised of an inlet part (1) of the same length as the pipe socket (11) and at least one laterally bowed, elongated outlet part (2) with a closed end (3) extending a distance within the ventilation duct (10). |
