3. Assemble the following parts using 6 #8 sheet metal screws. Both “B” and “C” panels should fit inside the bottom “A” panel flanges. Attach “B” and “C” (side panels) to “A” (bottom panel). After the bottom and sides are assembled, attach “A” (top panel) using 6 #8 sheet metal screws provided.
#8 Sheet Metal Screw
4. Position the assembled filter box on rear of furnace, supporting it firmly up to electrical enclosure, covering the rear distribution blower. Make sure the filter box is tightly pressed to the back of the furnace. Use 4 1/4” bolts (included) to firmly attach the filter box to sides of furnace.
The filter box requires one 20” x 20” x 1” filter (not included, but available at most hardware and home centers). For maximum furnace efficiency, inspect your filter regularly and replace the filter when airflow is restricted and the filter appears dirty. Some environments may require more frequent changing of the filter. Failure to replace the filter will result in excessive temperatures causing poor performance and damage to the furnace. It is strongly recommended to use less restrictive, low cost filters.
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