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FLEXIBLE BOOT IN
DUCT OR PLENUM
(RETURN AIR)
TYPICAL G21 INSTALLATION*
INTAKE PIPE (2" PVC)
EXHAUST PIPE
(2" PVC)
GAS CONNECTOR
CONTROL
ACCESS PANEL
BLOWER
COMPARTMENT
ACCESS PANEL
RETURN
AIR
SUPPLY AIR
CONDENSATE DRIP LEG
ISOLATION PADS (ISOMODE) (4)
DRIP LEG
FLEXIBLE BOOT IN PLENUM
OR DUCT (SUPPLY AIR)
RETURN AIR PLENUM 1.5
TO 3 LB. DENSITY, MATTE
FACE, 1 INCH THICK IN
SULATION INSULATED
PAST FIRST ELBOW
SUPPLY AIR PLENUM
1.5 TO 3 LB. DENSITY, MATTE FACE,
1 INCH THICK INSULATION
INSULATED PAST FIRST ELBOW
FLEXIBLE BOOT IN DUCT OR PLENUM (SUPPLY AIR)
FLEXIBLE BOOT IN PLENUM
OR DUCT (RETURN AIR)
MUFFLER**
MUFFLER**
**ALL G21/GSR2180/100 UNITS REQUIRE THE USE OF MUFFLERS. MUFFLERS ARE RECOMMENDED OPTIONS ON ALL OTHER UNITS.
*INSTALLATION PROCEDURES OUTLINED IN THIS MANUAL ARE PRESENTED AS RECOMMENDATION ONLY
AND DO NOT SUPERSEDE OR REPLACE LOCAL OR STATE CODE. IF LOCAL OR STATE CODES DO NOT EXIST,
THE PROCEDURES OUTLINED IN THIS MANUAL ARE RECOMMENDED ONLY AND DO NOT CONSTITUTE CODE.
ELECTRICAL CONDUIT:
IF CLAMPED TO UNIT
IT MUST BE ISOLATED
FROM DUCTWORK AND
JOISTS
MANUAL
MAIN SHUT OFF VALVE
FIGURE 43
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