Equipment Ventilation & Combustion Air Requirements - FULTON VSRT Series Installation, Operation And Maintenance Manual

INSTALLATION
Equipment Ventilation & Combustion Air
Requirements
Ventilation must be sufficient to maintain a building
temperature of 120 F (49 C) or less and the panel box
temperature must not exceed 125 F (52 C). Consistent, proper
ventilation of the equipment room is essential for good
combustion. Ventilation in the room must be sufficient to
provide adequate air flow throughout the room. Good venting
practices must be followed to ensure adequate air movement
throughout the entire room.
For proper combustion, the burner must have an adequate
supply of fresh air. Based on National Board Inspection Code
(NBIC) recommendations, unobstructed air openings shall be
sized on the basis of 1.0 square inch of free area per 2,000 BTU/
hr of the maximum fuel input of the combined burners in the
equipment room, or as specified by applicable national or local
codes. The equipment room air supply openings shall be kept
clear at all times. Please note that the required opening is the
required "free space" opening.
See Table 4 for minimum make-up air required and the
recommended area of each opening for each model.
TABLE 4 - MINIMUM MAKE UP AIR REQUIREMENTS AND
RECOMMENDED AREA OF EACH OPENING FOR VENTS
Unit Size Minimum Make Up Air
(BHP) Requirements (SCFM)*
9.5
10
15
20
30
40
50
60
80
100
125
250
*Minimum make-up air requirements are based on a 50% excess air
at high fire at 60˚ ambient temperature.
**Opening areas are calculated based input of a single boiler and do
not account for the ventilation needs of the equipment room. These
measurements are subject to state and location regulations. (one
square inch of free area per 2,000 BTU/hr input per NFPA & BOCA).
Free opening area must take into account the space taken up by
louvers, expanded metal, etc.
2-30
Free Opening
Area in
92 194
95 200
142 300
190 400
284 600
379 800
472 997
567 1,996
764 1,612
958 2,022
1,205 2,542
2,328 4,911
If positive forced ventilation (make-up air flow) is adopted,
you must ensure that there will be no appreciable pressure
variation in the equipment room.
Adhere to the following to meet ventilation and combustion
air requirements:
1. Install two fresh air openings, one at a low level, 24" (610
mm) from the floor, and one at a higher level on the
equipment room wall. This will provide a flow of air to
exhaust the hot air from the equipment room.
2. Avoid ventilation which creates a negative pressure
for boiler combustion air, as it will seriously affect
combustion and proper operation of the stack. The
equipment requires a steady neutral or slightly positive
combustion air supply. Unless sealed combustion
is used, the installation of an exhaust fan in a boiler
room is not recommended. An exhaust fan, or similar
equipment, can create down draft in the stack, or
restrict the burner's air supply, which will result in poor
combustion or nuisance failures.
3. It is essential that only fresh air be allowed to enter
the combustion air system. Foreign substances in the
combustion system can create hazardous conditions.
Particulate matter like lint, combustible volatiles,
dust, smog or chemicals (example, perchlorethlylene,
halogenated compounds) in the combustion air
supply to the equipment will cause damage or failure
2 **
of the burner and is not covered under warranty. Use
of a cyclone separator (VSRT 10-60) will separate solid
particles. It will not separate any chemical fumes.
Eliminate potential for high risk situations for particulate
matter to be in the air supply (e.g., as the result of
construction or maintenance activities). If foreign
substances can enter the air stream, the combustion air
inlet must be piped to an outside location. Failure to do
so will void the warranty.
4. VSRT Boiler is capable of ducted combustion air.
Reference Figures 30, 31, 32, 33 at the end of the
section. Note that with ducted combustion air, proper
room ventilation is still required.
SECTION 2
VSRT-IOM-2022-0728
© Fulton Group N.A., Inc. 2022