Run 10 inch insulated galvanized hot air duct from the outside furnace through a window or wall of the building . Once inside, you may use 250º Fahrenheit rated insulated flexible hot air duct to connect the central duct system for the building . When using flexible duct inside the building , it must be pulled tight with no offsets or elbows to prevent turbulence and slowdown airflow. Connect the duct with a 45° elbow or at an angle so the hot air from the Ignite Tech Furnace is delivered down stream. This will ensure proper airflow into the duct system. Avoid delivering the hot air through the air conditioning coil, as this will cause an obstruction, reducing the amount of heat output. DO NOT REDUCE THE SIZE OF THE HOT AIR DUCT. As with any furnace, longer runs and more turns and branches in the ducting greatly reduce the airflow and heat output. Use of 90° elbows is not recommended. The 12 inch cold air return duct must run to the building to prevent pressurization of the building . Failure to connect the cold air return will cause the furnace not to operate. NEVER REDUCE THE SIZE OF THE RETURN. Reducing the size of the cold air return will restrict the hot air flow and put excess pressure on the blower motor. You may terminate the cold air return where you enter the building . This will provide adequate circulation within the building . See diagram below .
RETURN AIR DUCT Return Air Duct
BACKDRAFT DAMPER Backdraft Damper
Open/Close Return Dampers
3 Places
S upply Duct
M ANUFACTURED OR MODULAR BUILDING DOWN DRAFT FURNACE CONNECTIONS: A qualified professional should do the installation. Maximum duct run is 25 feet, a duct run in excess of 25 feet will greatly restrict the air flow and heat output and is not recommended. Both the hot air duct and the cold air return duct may be accessed through the floor in a m anufactured or modular building . In a mo dular building with a down draft furnace, do not attach the hot air duct from the Ignite Tech Furnace to the hot air plenum . D oing so will cause the heat to rise through the central furnace instead of going through the duct work. Split the hot air supply for the Ignite Tech Furnace by using a “Y” and install one branch into each of the hot air ducts. Be sure both are pointing downstream. See diagram on P age 10 .
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