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Marvair MGA3090-3180 Wall Mount AC I&O Manual 05/2023 Rev.14
Fresh Air Hood Adjustment (non-economozer air conditioners only)
The fresh air hood is located on the inside, behind the slots on the bottom front panel. To access the
hood, remove the screws that hold the front panel. The air flow can be adjusted from no (0%) fresh air
to approximately 15% of rated air flow of fresh air, in 5% increments. The hood is shipped from the
factory in the closed position (no fresh air). To provide fresh air, remove the two screws on either side
of the hood and reposition as desired.
Fresh Air Hood Damper
