15
Marvair ModPac Installation & Operation Manual
11/2017 Rev.8
Galvanized metal duct extensions should be used to simplify connections to duct work and grilles. Use
fabric boots to prevent the transmission of vibration through the duct system. The fabric must be U.L.
rated (UL-181) to a minimum of 197ºF.
Basic Model
Maximum Total Static
Minimum Filter Area
12
.25
2.25 sq. ft.
24
.40
2.25 sq. ft.
30/36
.40
3.00 sq. ft.
42/48/60
.50
3.90 sq. ft.
Table 3. Maximum Static Pressure
2.5 Fresh Air Hood Installation
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.
0% 5% 10%
15%
0%
5%
10%
15%
0%
5%
10%
15%
Figure 3a. Fresh Air Hood Damper
for AVPA20-60
Figure 3b. Fresh Air Hood Damper
for AVPA12
2.6 Bottom Bracket Installation
1. The ModPac air conditioners have built-in mounting flanges. See Figure 4.
2. Refer to Figure 4. Attach the bottom support bracket to the wall using appropriate 3/8" diameter
hardware. Note: The AVPA12 does not require a bottom bracket.
For example, on wooden structures, use 3/8 x 2-1/2 inch all-thread lag screws. The screws must penetrate
the center of the wall stud. Drill a pilot hole in the stud to prevent it from splitting.
