Goodman GMH8 Technical Manual page 5

PRODUCT DESIGN
Accessibility Clearances (Minimum)
Unobstructed front clearance of 24" for servicing is rec-
ommended.
MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS - INCHES
Sides Rear Front*
1 0 3
* 24" clearance for serviceability recommended.
** Single Wall Vent (SW) to be used only as a conncetor.
Refer to the venting tables outlined in the Installation Manual for
additional venting requirements.
Note: In all cases accessibility clearance shall take pre-
cedence over clearances from the enclosure where ac-
cessibility clearances are greater. All dimensions are given
in inches.
Vent
Top
SW B
6 1 1
High Altitude Derate
IMPORTANT NOTE: The furnace as shipped requires no
change to run between 0 - 5500 feet. Do not attempt to
increase the firing rate by changing orifices or increasing
the manifold pressure below 5500 feet. This can cause poor
combustion and equipment failure.
High altitude installations above 5500 feet may require both
a pressure switch and an orifice change. These changes
are necessary to compensate for the natural reduction in
the density of both the gas fuel and the combustion air at
higher altitude.
For installations above 5500 feet, please refer to your dis-
tributor for required kit(s). Contact the distributor for a tabu-
lar listing of appropriate manufacturer's kits for propane gas
and/or high altitude installations. The indicated kits must be
used to insure safe and proper furnace operation. All conver-
sions must be performed by a qualified installer, or service
agency.
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