ConversionAir Filter for Return Air Grille Ducts - Standard Sizes
Simply remove your old filter and replace it with the 4" ConversionAir filter. No tools or modifications are necessary. The tapered shape allows the 4" depth to extend into the airway. The frame is permanent and the filter is disposable. The ConversionAir Filter quickly and easily converts your return air from the use of 1" filters to this new and innovative 4" design.
ConversionAir Return Grille Filter features
- The ConversionAir Filter lasts up to 12 months
- Last 4 times as long as a standard 1" return filter
- 4 times the dust holding capacity
- 4 times the media surface
