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HeatMax II Furnace Installation and Operation Manual
5.4 Configuration and restrictions of hot air distribution system
5.4.1 Start-off plenum
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The plenum can be adjusted from 64" (163 cm) to 88" (224 cm) depending on ceiling
height. See Section 5.1: Hot air distribution plenum height according to ceiling
height.
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The start-off plenum must have a minimum height of 24" (610 mm) from the top of the
furnace (X). In this case, use only the section of the plenum (the one with the 10
openings).
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The minimum clearance (C) between the top of the plenum and the ceiling is
5" (127 mm).
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The ducts minimum clearance (D) to combustible materials is 1" (25 mm).
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The ducts may pass through a combustible wall maintaining a clearance of 1" (25 mm)
around ducts.
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