© Fulton Group N.A., Inc. 2022
2-46
INSTALLATION
VSRT-IOM-2022-0728
SECTION 2
!
WARNING
To maintain a reasonable temperature in
the equipment area and ensure safety to
personnel, the section of the chimney duct
within the building should be insulated.
4
CAUTION
Concentration levels of only a few ppm
of chlorine containing compounds in
combustion air can produce serious
corrosion of the flue over long periods
of time. High chlorine containing
compounds such as carbon tetrachloride or
perchloroethylene would be prime suspects.
Venting Terminations
Adhere to the following for installation:
1. All vent pipes and fittings must be installed with appropriate air space
clearances to combustibles. These air space clearances apply to indoor or
outdoor vents—whether they are open, enclosed, horizontal or vertical or
pass through floors, walls, roofs, or framed spaces. The air space clearances
should be observed to joists, studs, sub floors, plywood, drywall or plaster
enclosures, insulating sheathing, rafters, roofing, and any other material
classed as combustible.
2. To prevent the possible re-circulation of flue gases, the vent designer
must take into consideration such things as prevailing winds, eddy zones,
building configurations, etc. Fulton cannot be held responsible for the
effects such adverse conditions may have on the operation of the boilers.
3. The required minimum air space clearances also apply to electrical wires
and any kind of building insulation.
4. Listed termination parts must be used.
5. Select the air intake point of penetration where a minimum of 1/4” per foot
(6.35 mm per .3 m) upward pitch can be maintained.
6. It is recommended to install a mesh bird screen, with minimum 1/2” by 1/2”
openings, at the combustion air intake termination. Climates subject to
extreme cold may require alternate configurations to provide an increased
surface area, such a cylindrical screens. Consult your venting supplier for
recommendations.
7. It is important to locate the exhaust termination in such a way that it does
not become blocked due to snow, ice, and other natural or man-made
obstructions. If terminating into a prevailing wind, direct elbow upward.
Avoid areas (example: courtyards) where swirling high winds may be
present.
Roof Vent Termination
Adhere to the following for installation (see
Figures 28, 30
):
1. The minimum vent height should extend at least 6 feet (1.8 m) above the
roof, or at least 6 feet (1.8 m) above the highest part of any structure within
10 feet of the vent.
2. When installing inlet and exhaust terminations above the roof, the exhaust
outlet must be installed 4 feet (1.22 m) minimum above and 4 feet (1.22 m)
minimum downwind from air supply inlet to prevent exhaust recirculation
(see
Figures 28, 30
).
