Designer Guide

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LOCHINVAR, LLC
300 MADDOX SIMPSON PKWY
LEBANON, TN 37090
www.lochinvar.com
Designer’s Guide / Knight XL Boiler
4. DIRECT OUTSIDE AIR, SINGLE OPENING
If a single combustion air opening is provided to bring
combustion air in directly from the outdoors, the opening
must be sized based on a minimum free area of one
square inch per 3000 Btu/hr (7 cm² per kW). This opening
must be located within 12" (30 cm) of the top of the
enclosure.
COMBUSTION AIR FILTER
The Knight XL has an optional air filter box. Located
on the left side over the combustion air inlet, the air
filter is installed to help ensure clean air is used for the
combustion process. The optional air filter box kit is
part number KIT30022.
The filter size is 12" x 12" x 1" (40.6 cm x 30.4 cm x 2.5
cm). You can find these commercially available filters
at any home center or plumbing supply store.
THE COMBUSTION AIR MUST BE FREE OF ANY CONTAMINANTS OR CHEMICAL FUMES. SALTS,
REFRIGERANTS AND SOLVENTS INTRODUCED INTO THE COMBUSTION PROCESS WILL RESULT IN
THE FORMATION OF CORROSIVE ACIDS THAT WILL DAMAGE THE APPLIANCE AND THE VENT.
Caution