5 Hot air distribution and air return system Your furnace is designed and equipped with a hot air distribution plenum that may receive 6 to 10, 6" (152 mm) diameter round ducts. The installer is responsible of the performance of the distribution ducts and the air return system. It will have a direct effect on the ability of the blower to distribute heat efficiently throughout the house. The number, size and length of the ducts of the distribution system and return air will vary depending on the configuration and characteristics of each house. N.B.: The furnace air jacket is not totally airtight. It is normal to detect some air leaks at the jacket’s joints. Components provided with the furnace to assemble the hot air distribution plenum:
10 start-off adapter (A)
4 block-off cap (B)
44 Type A #10 black screws (C)
25 #8 selt- taping black screws (D)
4 corners reinforcem ent ( E)
1 reload button sticker reminder (F)
5.1 Hot air distribution plenum height according to ceiling height Remember to take into account the 5" (127 mm) clearance to combustibles above the plenum.
5.1.1 Plenum’s minimum height (63 ½’’ (1613mm) from the furnace base) For a minimum ceiling height of 69" (1750 mm).
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