| 摘要 |
A heating and air conditioning unit has a fan compartment containing a hammock-type filter. The hammock-type filter rests upon feet elevated above the bottom of the fan compartment so that air may flow into the fan through either the bottom panel of the hammock filter or either of the side panels. The front and back of channels of the bottom pannel are telescoped so that they can be expanded and always be longer than the width of the fan. Sponge rubber is provided at the front and back so that if a larger compartment is used that air leakage at the front and back is prevented by the sponge or foam rubber. The top edges of the side panels rest against the sides of the fan compartment. Foam rubber along these edges prevents noise caused by vibration as well as preventing air leakage. The hammock filter is readily removed from the fan compartment and the filter unit is inserted by either tucking the filter into the channel, if it is flexible or sliding it in through one end, having removed an end channel to provide an opening therefore. If a flexible filter is used a stiff mesh is placed upon the fan side of the filter to prevent the flow of air from ballooning the filter out of the channels. Also, rubber bands are extended diagonally across any panel if the stiff mesh is not sufficient to prevent the ballooning.
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