Fig. 27—Typical Outdoor-Air Tunnel
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THERMOSTAT WIRES
RETURN-AIR GRILLE
(AIR FILTER BEHIND
RETURN-AIR GRILLE)
OUTDOOR
AIR INTAKE
MAIN POWER
CONNECTIONS
BOTTOM
BOARD
HOME
SKIRTING OR
FOUNDATION
WALL
CONDENSATE
DRAIN PIPE
GRILLE OR
SCREEN
GROUND
1" DUCTBOARD
1" DUCTBOARD
2" X 2"
TREATED
LUMBER
Fig. 28—Drain Pipe Routing
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NET FREE AREA (SEE VENTILATION
REQUIREMENTS TABLE)
SIZES MAY VARY AS LONG AS THE
MINIMUM NET FREE OPEN AREA
(INCLUDING GRILLE) MEETS THE
REQUIREMENTS LISTED IN
VENTILATION REQUIREMENTS TABLE.
BOTTOM
BOARD
BACKFILL WITH DIRT
FOR GOOD AIR SEAL
GROUND
DRAIN PIPE
TO OUTSIDE
(CONNECT TO
OUTSIDE)
SEAL W/DUCT
TAPE AND/OR
CAULK
SEAL W/DUCT
TAPE AND/OR
CAULK
OUTDOOR AIR PLENUM
2"X2"
TREATED
LUMBER
1"
DUCTBOARD
—14—
