| 摘要 |
<p>The present invention relates to a filter frame (10, 12, 14 and 16) having an interior which contains a granular filter medium (22) when the filter frame is in use, a first main aperture across which a first screen part (18) extends, and a second main aperture across which a second screen part (20) extends, so that a fluid which is to be filtered can pass into the frame interior through one of the screens (18 or 20) and out through the other (20 or 18). The filter frame is provided with further aperture means (24, 26) to enable such a medium (22) to be removed from and/or fed into the interior of the filter frame (10, 12, 14 and 16) whilst the latter is installed for use, without the need to dismantle it.</p> |
