Drolet HEATPRO DF03000 Installation And Operating Instructions Manual page 27

HeatPro Furnace Installation and Operation Manual
- Block the unused outlets with the block-off caps (B) and provided screws (D).
FAVOR THE USE RIGID DUCTS BECAUSE THERE ARE LESS RESTRICTIVE TO AIR
FLOW.
- The maximum run of a main duct is 35' (10.7 m). It must be reduced from 6" (152 mm)
to 5" (127 mm) after 20' (6.1 m) or reduce the main duct by 1" (25 mm) at every two
secondary duct outputs.
- The maximum length of all the main ducts is 180' (54.9 m).
- The maximum run of a secondary duct is 10' (3 m).
- The maximum length of all the secondary ducts is 100' (30 m).
- The finishing grill at the output of a secondary pipe must be made of metal.
The total area of secondary duct outlets must be equal or slightly less than the total area of
the outlets used on the distribution plenum (B).
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