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All installations and services must be performed by qualified service personnel.
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D. BASE INSTALLATION
1. Combustible Floor Base Model: 70-BASE
Referring to Figure 1A, for applications using a combustion air channel and a supply
air duct, use the base as a template to mark the floor opening locations. See Figure
2 for cutout locations. Cut a square opening in the floor for the supply air duct. Cut
the opening 1-inch larger than the square template opening. Cut the combustion air
duct opening. See Figure 1A for cutout sizes.
Figure 2
Place the bottom base panel in position. Mark the square opening location on the
distribution duct at the connection point of feeder duct. Remove the bottom panel.
Cut an opening in the duct slightly larger than the feeder duct. Cut the feeder duct to
length. (Refer to Figure 3 for location of this cut.) Install the feeder duct. Bend over
each tab. Insure an airtight seal by using high temperature sealant or tape on the
joint. Reinstall the bottom panel over the feeder duct. Insert and secure the
combustion air duct. Put the top panel in place.
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?CAUTION: A combustion air duct must be used. If the underside of the mobile
home is skirted or enclosed (e.g. enclosed in a crawlspace), the combustion air
intake should exit through the skirting, or enclosure, if at all possible. All joints
and seams of supply ducts and combustion air ducts must be closed with a
sealing method suitable to the application conditions and temperatures (e.g. high
temperature silicone caulk and/or aluminum tape).