YMGI: Your Modern Green Idea
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
36
FRESH AIR INTAKE
Connecting Fresh Air Duct
The indoor ceiling cassettes have a fresh air intake port for ventilation. A booster fan and duct (field supplied) must be
used to feed outdoor air to the indoor unit.
Determine the duct diameter, length and booster fan size based on the required airflow. See table below for duct and hole
sizes:
Unit Size
Hole Diameter
Min. Duct
Diameter
(BtuH)
inch (mm)
18,000
2.375 (60)
2.5 (64)
24,000 - 48,000
2.875 (73)
3.0 (76)
NOTE:
Fresh air intake amount should be 20% or less of whole air amount to prevent condensation.
To install fresh air intake:
•
Locate the fresh air hole on side of cassette unit
•
Carefully remove knockout to open fresh air hole
•
Cut a round hole through insulated wall
•
Using a duct collar, attach fresh air duct to cassette