5. The 14-1/4" x 14-1/4"(±1/8) roof opening is part of the return air duct and must be
finished in accordance with NFPA standard 501C, Standard for Recreational
Vehicles, Section 2-7.
It is the responsibility of the installer of this system to ensure structural
integrity of the RV roof. Never create a low spot on the roof where water
will collect. Water standing around the air conditioner/heat pump may
leak into the interior causing damage to the product and RV
AIR RETURN GRILL INSTALLATION (ACRG12)
The Air Return Grill is designed for application in systems that utilize field fabricated (OEM supplied) air ducting. The
ducting must be routed through the ceiling cavity (between the interior ceiling and roof). Ducting specifications are given in
the section labeled “Supply Ducting and Registers”.
INSTALLATION REQUIREMENTS
(ROOF THICKNESS MUST BE AT LEAST 2.5")
1. The ACRG12 must be installed under the roof opening. The ACRG12 bolts to the underside of the roof unit.
Compression of the framed ceiling cavity between the roof unit and the ACRG is what holds both components in
place.
2. Ceiling cavity depth (the measurement from the ceiling to the roof): 5.5" – Maximum, 2.5" - Minimum
3. The 115 VAC service for the air conditioner / heat pump must be routed into the ACRG12 (refer to the wiring
diagram below). 12VDC should be routed to the digital control box. If a LP furnace is being used, a control wire
must be connected from the furnace to the analog control box for proper operation.
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