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Installation & Operation Manual
29
Lochinvar offers an optional room air kit. The room air filter box must be installed over the air intake on the left side of the
unit as shown in FIG. 5-4.
• Vent system and terminations must comply with the standard venting instructions set forth in this manual.
• The total length of vent pipe must not exceed the limits given in the General Venting section on page 19 of this manual.
• The air filter box uses an 12 x 12, one inch filter (see Table 5A). This air filter is provided to help ensure clean air is
used for the combustion process. Check this filter every month and replace when it becomes dirty.
Vertical termination – optional room air
Model Kit Number
399 - 800 KIT30022
Table 5A Optional Room Air Kit
OPTIONAL ROOM
AIR FILTER BOX
Figure 5-4 Optional Room Air Filter Box
5 Vertical direct venting (continued)
The Knight XL may be installed with a single pipe carrying the flue products to the outside while using combustion air from
the equipment room. The vent pipe may terminate vertically above the roof line in a conventional vent manner (see FIG. 5-4).
Follow the requirements in the General Venting and Vertical Direct Venting sections for vent material specifications, vent length
requirements, and vent termination requirements.
ƽ WARNING
When utilizing the single pipe method, provisions for combustion and ventilation air must be in accordance
with Air for Combustion and Ventilation, of the latest edition of the National Fuel Gas Code, ANSI Z223.1,
in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and
Equipment, or applicable provisions of the local building codes.
The equipment room MUST be provided with properly sized openings to assure adequate combustion air and proper
ventilation.