Process 8 - Recirculation Ductwork Installation
Step 1 - Assembly of the Recirculation Ductwork – Reference Figure 17 (Reference Drawing Packet for Item Details) a) Take one of the 90° broke pieces and slip a corner clip into the duct mate flange located on the end with the ½” 90° flange . b) Take the appropriate mate to the piece and slip the corner angles that were just installing into the duct mate flanges that have the Pittsburgh seamed edge . c) Set the ½” flange into the Pittsburgh seam completely. It may be necessary to tap with a hammer to set into position . d) Once the flange is completely set into the seam, starting on the end near the corner clip, fold the seam over the top of the flange with a hammer or air hammer for about 2-3 inches . e) Move to the opposite end of the seam and repeat step (d) . f) Locate the center of the seam and repeat step (d) . g) Now the entire seam must be rolled over the edge of the flange while ensuring the flange is completely set into the Pittsburgh seam . h) Repeat steps (a) through (g) for the opposite corner of the ductwork section . Step 2 - Installation of Recirculation Ductwork – Floor Mounted Heater Box Skip to Step 3 for Roof Mounted Heater Box a) Prior to ductwork installation some flashing pieces must be in place reference Figure 29 for these items . b) Install the transition ductwork located in front of the heater box Reference Figure 18 . c) The ductwork piece must be attached to the heater box using the Tek screws provided around the air discharge ductwork . > Maximum spacing between screws will be 10 inches . > Ductwork transition should be 6 inches above the floor . > Ensure the transition duct is level before fastening . d) Securely fasten the top of the transition duct to the rear wall using the angle brackets – Reference Drawing Packet for details .
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