Replacement Parts List

page 5
DUCTWORK INSTALLATION
Duct length distance, a maximum of 30 linear feet of standard duct pipe and two (2) 90° elbows at 1.
maximum firing rate. Subtract 7' from the maximum linear feet for every 90° elbow added.
Route the ductwork from the VRV tee to the inlet vent termination with as few elbows as possible.2.
Secure and support the ductwork for the design and weight of the material used, to prevent physical 3.
damage and separation of joints. For guidelines refer to recognized national building codes or any local
codes.
To reduce uncontrolled air leakage into the duct, tape all joints and seams using standard duct tape.4.
NOTE: Try to run a minimum of 12' of duct to help temper the outside air being brought into burner.
PIPE
DIAMETER
MAXIMUM EQUIVALENT PIPE FEET
(BETWEEN AIR BOOT™ AND
DUCT TERMINATION)
ELBOW*
EQUIVALENT FEET
REDUCER OR INCREASER
EQUIVALENT FEET
4" 44' 7' -
5" 60' 9' (4" to 5") 3'
6" 90' 11' (4" to 6") 6'
*Note: Subtract the elbow or reducer equivalent feet from the maximum equivalent feet
to get maximum linear feet of pipe.
NOTE: Longer pipe lengths require the use of a larger pipe between the VRV and the intake hood. It also requires
the use of a vent pipe increaser at the VRV and a reducer at the intake hood. (See Table 1)
Table 1