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2. Bend the rear ventilation panel 90o along the dotted line (some models).
Air return flange
Ventilation panel
Air return flange
Ventilation panel
Or
FRESH AIR DUCT INSTALLATION
This unit allows for a fresh air duct to be installed. Duct location and dimensions are shown below.
Fresh air duct joint
Ø3.62”(92mm)
Ø4.45”(113mm)
DRAD09F1A & DRAD12F1A
Ø4.92”(125mm)
Ø6.3”(160mm)
DRAD18F1A & DRAD24F1A
3. Swap the mounting positions of the ventilation panel and air return flange.
4. Install the filter mesh. Insert into flange as illustrated below.