DetailsThis filter box is designed to work in conjunction with DAKA furnaces that have been equipped with twin/dual blowers. When using a No. 273 Twin Blower Kit on furnace Models 521, 521FB, or 621, this Filter Box will cover both of the blowers and provide a place to attach a cold air return line. The back sheet metal panel provided is blank and ready to be cut to accommodate your size cold air return line. A minimum of a 10" round return line must be used. Filter Box takes one 14" x 25 x 1" fiberglass furnace filter (not included.). May be used on models 311/411/412/521/ 521FB/621/622 and many earlier Deluxe models.
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