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Installation & Operation Manual
1 Determine boiler location (continued)
11
Combustion and ventilation air
requirements for appliances drawing air
from the equipment room
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.
Maintain minimum specified clearances for adequate
operation. All installations must allow sufficient space for
servicing the vent connections, water pipe connections,
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 this manual.
Multiple appliances may be installed in a modular boiler
installation. Multiple appliances may be installed side by side
with no clearance between adjacent appliances because this
appliance is approved for zero clearance from combustible
surfaces and no service access is required from the sides.
Consult the Vent ing section of this manual for specific
installation instructions for the appropriate type of venting
system that you will be using.
Figure 1-4_Combustion Air Direct from Outside
(b) Ventilation air opening, with a minimum free
area of one square inch per 4000 Btu/hr input
(5.5 cm
2
per kW). This opening must be
located within 12" (30 cm) of the top of the
enclosure.
Figure 1-5_Combustion Air Through Ducts
2. If combustion and ventilation air is taken from the
outdoors using a duct to deliver the air to the
equipment room, each of the two openings should be
sized based on a minimum free area of one square inch
per 2000 Btu/hr (11 cm
2
per kW) of input (see FIG. 1-5).
IF NECESSARY
FOR TIGHT
CONSTRUCTION
Figure 1-6_Combustion Air from Interior Space
1. If air is taken directly from outside the building
with no duct, provide two permanent openings to
the equipment room (see FIG. 1-4):
(a) Combustion air opening, with a minimum free
area of one square inch per 4000 Btu/hr input
(5.5 cm
2
per kW). This opening must be
located within 12" (30 cm) of the bottom of the
enclosure.
3. If air is taken from another interior space, each of the
two openings specified above should have a net free
area of one square inch for each 1000 Btu/hr (22 cm
2
per kW) of input, but not less than 100 square inches
(645 cm
2
) (see FIG. 1-6).