Providing clean and tempered makeup air to meet your application needs. The push-through design
ensures that combustion fumes will not enter the fresh air stream.
The Modular Indirect Fired Bent Tube Heater is designed to deliver clean air into an indoor
environment. Units are designed for indoor or outdoor installation, and can use either Natural or
LP gas. The standard unit includes a blower module and the IBT heater module that is approved in
the United States and Canada. The unit is listed to the ANSI Z83.8-2006 and CSA 2.6-2006 standards.
Each furnace has a 6:1 Turndown Ratio and a maximum Turndown of 28:1 for the entire unit, depending
on total required BTU Capacity and number of furnaces in the unit.
Every unit is programmed to start in high fire mode to ensure consistent light-off and is
equipped with an electronic, Vernier-type fully-modulating control system. The duct furnaces are
all type-409 stainless steel, and certified by the American Gas Association and approved by the
Canadian Gas Association. Each model utilizes at least one, but not more than two, modulating
stage(s) and between zero and two additional ON/OFF stages depending on the required heat
output. In addition, the speed of its power-vent blower on the modulating furnace(s) is varied
as the gas flow changes; thereby maintaining a constant 80% combustion efficiency over the
entire gas-firing range of the unit.
Combination packages that include both exhaust and supply fans mounted on a single roof curb
are also available; please contact your sales representative for more information.