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Installation Instructions
MERV Filter Box
B. Bottom Return Applications
1. Remove the duct flange from the rear return opening.
2. Remove the bottom return cover and install it in the rear return opening.
3. Install the duct flange on the bottom return opening.
4. Align the filter box so it slides over the duct flange and fits tightly on the flange.
5. Secure filter box with sheet metal screws or rivets.
6. Install the specified size filters in the slot and place the cover over the filter access opening.
MERV filter installation on rear return of a mid static duct indoor unit
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31-5000557 Rev. 0 09-20 GEA
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