INSTALLATION
2-9
2.8.1 COMBUSTION AIR FROM OUTSIDE
THE BUILDING
Air supplied from outside the building must be
provided through two permanent openings. For
each unit these two openings must have a free
area of not less than one square inch for each
4000 BTUs input of the equipment or 250 square
inches of free area. The free area must take into
account restrictions such as louvers and bird
screens.
2.8.2 COMBUSTION AIR FROM INSIDE
THE BUILDING
When combustion air is provided from within the
building, it must be supplied through two
permanent openings in an interior wall. Each
opening must have a free area of not less than
one square inch per 1000 BTUH of total input or
1000 square inches of free area. The free area
must take into account any restrictions such as
louvers.
2.8.3 SEALED COMBUSTION
The unit is UL approved for a 100% sealed
combustion application when installed properly.
When a sealed combustion air application is
installed, the sealed combustion air piping must
be deducted from the maximum allowable
discharge piping amounts. Each unit must have a
minimum 6" diameter connection made to the
optional Inlet Air Adapter # GM-18917 available
from AERCO. This Adapter bolts directly on to
the air inlet of the unit blower. See installation
instructions with Adapter. All inlet air ducts must
be sealed air tight.
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