DURASTAR DRAD09F1A - MAINTENANCE FOR NON-USE; Long Periods of Non-Use; Pre-Season Inspection

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2. Bend the rear ventilation panel 90 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.