Product Manual

HeatPack Furnace Installation and Operation Manual

7.3.1 Minimum amount of outlets and maximum lengths of ducts

 A minimum of 6 start-off adapters must

be installed on the start-off plenum. The

location of the adapters has no impact

on the distribution of air.

 Block the unused outlets with the block-off caps (F) provided with the plenum and

the screws (D) provided in the user manual.

FAVOR THE USE OF 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.