| 摘要 |
A nestable frame for planar air filters or other screen-like planar structures. The nestable frame provides all of the following desirable properties at once: 1. Simple manufacturing and assembly process, 2. Simple design, 3. Enhanced structural rigidity, 4. Significant space-savings during storage and transport, and 5. Simple handling. Preferably, the filter frame comprises an upper and a lower frame portion with a first leg each, where the peripheral edge of the filter media is clampingly engaged between the first leg of the upper frame portion and the first leg of the lower frame portion. From the first leg, the upper frame portion extends outwardly with at least two legs folded into a vertically flipped V. The lower frame portion may or may not have one additional second leg extending outwardly from the first leg, in parallel direction and intimately connected to the second leg of the upper frame portion. Alternative embodiments may contain additional corresponding and intimately connected legs in the upper and lower frame portions, so that the cross-sectional shape of the frame is varied. Further included in the present invention are manufacturing methods for the stackable frame.
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