Filter
Top Products
5
NOTE
Clearances from combustible construction are noted on the
appliance rating plate.
Maintain minimum specified clearances for adequate operation.
All in stal la tions must allow sufficient space for servicing the vent
connections, water pipe connections, integral circulating pump,
bypass piping and other auxiliary equipment, as well as the
appliance. The clearance labels on each appliance note the same
service and combustible clearance requirements as shown in the
clearances from combustion construction table.
Multiple appliances may be installed in a modular boiler or water
heater in stal la tion. Multiple appliances may be installed side by
side with no clear ance between adjacent appliances because this
appliance is approved for zero clearance from combustible sur fac -
es and no service access is required from the sides.
Consult the venting section of the manual for specific installation
in struc tions for the appropriate type of venting system that you will
be using. Direct Vent and Intelli-Vent venting systems require
installation with Category IV flue pipe, sealed air inlet pipe and air
inlet caps, which must meet the manufacturer’s specifications.
COMBUSTION AND VENTILATION
AIR REQUIREMENTS FOR
APPLIANCES DRAWING AIR FROM
THE EQUIPMENT ROOM
Provisions for combustion and ven ti la tion air must be in accordance
with Section 5.3, Air for Combustion and Ventilation, of the latest
edition of the National Fuel Gas Code, ANSI Z223.1, in Canada,
the latest edition of CAN/CGA Standard B149 Installation Code
for Gas Burning Appliances and Equip ment, 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
when the unit is installed with a basic Category IV venting system.
FIG. 5 Combustion Air Direct from Outside
1. If air is taken directly from outside the building
with no duct, provide two permanent openings:
a. Combustion air opening, with a min i mum free
area of one square inch per 4000 Btu input
(5.5 cm
2
per kW). This opening must be located
within 12" (30cm) of the bottom of the
enclosure.
b. Ventilation air opening, with a minimum free
area of one square inch per 4000 Btu input
(5.5 cm
2
per kW). This opening must be located
within 12" (30 cm) of the top of the enclosure.
FIG. 6 Combustion Air Through Ducts
2. If combustion and ventilation air is taken from the outdoors
using a duct to deliver the air to the mechanical room, each of
the two openings should be sized based on a minimum free
area of one square inch per 2000 Btu (11 cm2 per kW) of input.