Questions? Please Contact Your Local Manufacturer’s Representative
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SECTION 2 VTG-IOM-2016-1214 INSTALLATION
! WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct, and strict
adherence to applicable jurisdictional/
professional codes and regulations.
Never install a barometric damper on ue
systems designed with positive pressure.
Combustion Air Supply From the Boiler Room
Adhere to the following for installation:
1. Adequate free access of combustion air and ventilation must be supplied to
the boiler room in accordance with local codes and NFPA 54/ANSI Z233.1,
Section 9.3, Air for Combustion and Ventilation or CSA-B149.1 for Canada.
The minimum net free area requirements in Table 7 may not supersede
local and jurisdictional codes and regulations where these codes and
regulations require an opening of greater net free area. The boiler room
must meet the NFPA criteria for a non-conned space.
2. Verify combustion air is taken from the outdoors and not from inhabited or
occupied spaces within the building. Ensure space and nearby products are
evaluated for the potential of combustion air contaminants. See Table 6.
TABLE 6 PRODUCTS/CONTAMINANTS TO AVOID
Products to
Avoid
Products containing chloro/ourocarbons;
chlorine based products; calcium chloride
products, sodium chloride products, paint and
varnish removers, hydrochloric acid, muriatic
acid, cements, glues, antistatic fabric softeners,
freon, drywall particles, dirt, berglass
Areas with the
potential to have
contaminants
Dry cleaning/laundry areas; swimming pools;
repair shops; processing plants; manufacturing
plants, new construction
3. For installations providing two permanent openings directly
communicating with the outdoors, the minimum net free area of each
opening is 1 in
2
per 4,000 BTU/hr of the total input capacity of the
combined burners located in the boiler room. Ensure a high opening
commences within 12 inches of the ceiling, and a low opening commences
within 12 inches of the oor. See Table 7.
4. For installations providing a single permanent opening directly
communicating with the outdoors, the minimum net free area is 1 in
2
per
3,000 BTU/hr of the total input capacity of the combined burners located in
the boiler room. See Table 7.
TABLE 7 COMBUSTION AIR OPENINGS NET FREE AREA
Boiler Input
Capacity
MBTU/HR
Two Openings Min. Net
Free Area of Each SQFT
Low High
Single Opening Only
Min. Net Free Area
SQFT
2,000 3.5 3.5 4.6
3,000 5.2 5.2 6.9
4,000 6.9 6.9 9.3
5,000 8.7 8.7 11.6
6,000 10.4 10.4 13.9