Combustion From Outside The Building; Combustion Air From Inside The Building; Ducted Combustion Air - Benchmark BMK 1500 User Manual

Benchmark 1500 - 2000 Boilers
CHAPTER 2 – INSTALLATION
Whenever the environment contains these types of chemicals, combustion air MUST be
supplied from a clean area outdoors for the protection and longevity of the equipment and
warranty validation.
The more common methods of combustion air supply are outlined in the following sections. For
combustion air supply from ducting, consult the AERCO GF-2050, Gas Fired Venting and
Combustion Air Guide.

2.12.1 Combustion From Outside the Building

Air supplied from outside the building must be provided through two permanent openings. For
each unit these two openings must have a free area of not less than one square inch for each
4000 BTUs input of the equipment or 375 square inches of free area for the BMK 1500 or 500
square inches of free area for the BMK 2000. The free area must take into account restrictions
such as louvers and bird screens. For Canada installations, refer to the requirements specified
in CSA B149.1-10, sections 8.4.1 and 8.4.3.

2.12.2 Combustion Air from Inside the Building

When combustion air is provided from within the building, it must be supplied through two
permanent openings in an interior wall. Each opening must have a free area of not less than
one square inch per 1000 BTUH of total input or 3000 square inches of free area. The free area
must take into account any restrictions, such as louvers.

2.13 DUCTED COMBUSTION AIR

For ducted combustion air installations, the air ductwork must then be attached directly to the air
inlet connection on the sheet metal enclosure.
In a ducted combustion air application, the combustion air ducting pressure losses must be
taken into account when calculating the total maximum allowable venting run. See the AERCO
Benchmark Venting and Combustion Air Guide, GF-2050. When using the unit in a ducted
combustion air configuration, each unit must have a minimum 8 inch diameter connection at the
unit.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
OMM-0097_0C Page 31 of 184
Ph.: 800-526-0288
GF-142