32 UNT-IOM-6
The unit’s airflow configuration varies dependent on the model and
options ordered. A one-inch duct collar is provided on units with a
ducted return and/or discharge to attach ductwork to the unit.
The Trane Company recommends using galvanized sheet metal
ductwork with fan-coil and cabinet heater units. Slide the sheetmetal
duct over the duct collar flange of the unit, seal the joint and fasten
with sheetmetal screws.
Note: Do not run screws through the removable front panel on con-
cealed units.
Install all air ducts according to National Fire Protection Association
standards for the Installation of Air Conditioning and Ventilating
Systems (NFPA 90A and 90B).
Follow the general recommendations listed below when installing
ductwork for the unit.
• Discharge ductwork should run in a straight line, unchanged in size
or direction, for a minimum equivalent distance of 3 fan diameters
from the unit (approximately 20 inches).
• When making duct turns and transitions avoid sharp turns and use
proportional splits, turning vanes, and air scoops when necessary.
• When possible, construct, and orient supply ductwork turns in the
same direction as the fan rotation.
Duct Connections
Ductwork
Recommendations
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