AERCO KC1000 Boiler July 2011 - Manual (Page 21)

INSTALLATION
2-11
1000 square inches of free area. The free area
must take into account any restrictions such as
louvers.
2.10.3 SEALED COMBUSTION
The KC Boiler is UL approved for 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
special Inlet Air Adapter # GP-18917 available
from AERCO. This adapter bolts directly on to
the air inlet of the unit’s blower. See installation
instructions with adapter. All inlet air ducts must
be sealed air tight.