Indoor Installations
Installations with Ambient Combustion Air Supply
For indoor installations, duct furnaces typically draw combustion air from
the space surrounding the heating unit. Customer designed cabinets
must have properly sized Combustion air openings must be provided in
a panel with access to the burner vestibule area.
Installation must be in an unconfined space with sufficient volume for all
appliances located in the space. A single, properly sized pipe from the
duct furnace vent connector to the outdoors must be provided.
Furnaces may be vented vertically or horizontally as shown in Figures
below.
