S&P TRC1200 Installation, Operation & Maintenance Manual page 7

INSIDE DUCTWORK SYSTEM
FOLLOW ENGINEER'S DUCTWORK DESIGN
Ductwork should be designed by an engineer to allow the unit to provide the required airflow and
reduce pressure drop for efficient, quiet operation.
AIRFLOW RATES
The airflow rate for both the Supply Air and the Exhaust Air should be roughly equal (or balanced")
for best performance of the TRC1200 Unit. See unit specification sheet for CFM/ESP curves.
DUCT TRANSITIONS
Ducts should enter and exit the unit through smooth, gradual transitions.
DUCT INSULATION
If the inside ducts run through un-conditioned spaces, they must be insulated, with a sealed vapor
barrier on both inside and outside of insulation.
The Supply Air inlet should be at least 10' away from chimneys, furnace and water heater exhausts,
and other sources of carbon monoxide, humidity or other contamination. Do not locate the Supply Air
inlet where vehicles may be serviced or left idling. Never locate the Supply Air inlet inside a structure.
RAIN ENTRY PREVENTION
To prevent the entry of rain through the outside air inlet duct, observe the following:
1. Velocity at face of inlet hood should not exceed 500 feet per minute (fpm).
2. Inlet duct must be at least 18" x 18".
3. Centerline length along duct from weather hood to unit inlet must be at least 48".
4. Inlet duct must pitch downward to the outside; centerline of inlet hood must be at least 18" below
the centerline of the unit inlet.
5. Outlet duct must pitch downward to the outside with a slope of at least ¼" to the foot.
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