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Modulex Light Commericial Series
CHAPTER 4: Installation Instructions
When one expects contaminated combustion air (near swimming pools, chemical cleaning
operations, hair salons, etc.), sealed combustion operation is recommended.
WARNING!
Fire danger due to flammable materials or liquids. Do not store flammable materials and
liquids in the immediate vicinity of the boiler.
See Section 4.6.2 for warnings and guidelines concerning materials and contaniments that
should be avoided in the boiler room and near air inlets when operating the boiler.
Room Air Combustion
The boiler closet or room shall be provided with two permanent openings communicating
directly with an additional room(s). The total input of all gas utilization equipment installed in the
combined space shall be considered in making this determination. Each opening shall have a
minimum free area of 1 square inch per 1,000 Btu per hour of total input rating of all gas
utilization equipment in the confined space, but no less than 100 square inches. One opening
shall commence within 12 inches (305 mm) of the top, and one opening shall commence within
12 inches (305 mm) of the bottom of the enclosure. The minimum dimension of air openings
shall not be less than 4 inches (101.6 mm).
Sealed Combustion
The boiler closet or room shall be provided with two permanent openings, one commencing
within 12 inches (305 mm) from the top of the enclosure, and one commencing within 12 inches
(305 mm) from the bottom of the enclosure. The openings shall communicate directly, or by
ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.
The minimum dimension of air openings shall be no less than 4 inches (101.6 mm).
1) Where directly communicating with the outdoors, each opening shall have a minimum free
area of 1 square inch per 4,000 Btu/hr of total input rating of all equipment in the enclosure.
2) Where communicating with the outdoors through vertical ducts, each opening shall have a
minimum free area of 1 square inch per 4,000 Btu/hr of total input rating of all equipment in
the enclosure.
3) Where communicating with the outdoors through horizontal ducts, each opening shall have
a minimum free area of 1 square inch per 2,000 Btu/hr of total input rating of all equipment
in the enclosure.
4) Where ducts are used, they shall be of the same cross-sectional area as the free area of the
opening to which they connect.
4.24 INSTALLATION OF THE EXHAUST AND AIR INTAKE SYSTEM
NOTE:
Consult local and state codes pertaining to special building code and fire department
requirements. Adhere to national code requirements.
Observe the listed maximum lengths of vent system, which are dependent on boiler model. The
maximum permissible lengths are listed in section 4.25, below.
Minimum clearance of 4 ft. (1.22m) horizontally from, and in no case above or below, unless a 4
ft (1.22 m) horizontal distance is maintained, from electric meters, gas meters, regulators and
relief equipment.
OMM-0087_J • GF-143 • 11/17/2020
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 53 of 150
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