Specifications
© The Fulton Companies 2012
INSTALLATION VTG-IOM-2012-1001 SECTION 2
2-18
TABLE 4 GENERAL VENTING REQUIREMENTS
Vantage Model
Number
Maximum
Negative Draft
Maximum
Positive Draft
VTG-2000 -0.04 “ W.C. +0.35 “ W.C.
VTG-2500,
2500DF
-0.04 “ W.C. +0.35 “ W.C.
VTG-3000 -0.04 “ W.C. +0.35 “ W.C.
VTG-3500,
3500DF
-0.04 “ W.C. +0.35 “ W.C.
VTG-4000 -0.04 “ W.C. +0.35 “ W.C.
VTG-5000,
5000DF
-0.04 “ W.C. +0.35 “ W.C.
VTG-6000 -0.04 “ W.C. +0.35 “ W.C.
VTG-2000DF -0.1 “ W.C. +0.40 “ W.C.
VTG-3000DF -0.1 “ W.C. +0.50 “ W.C.
VTG-4000DF,
4000LE
-0.1 “ W.C. +0.50 “ W.C.
VTG-3000LE -0.04” W.C. +0.50 “ W.C.
7. Make-up air ventilation openings are recommended for
each installation size in Table 5:
TABLE 5 MAKEUP AIR VENTILATION OPENINGS
Total Input of boiler
(1000 BTU/HR)
Free Area (square
feet)
2000 6
2500 9
3000 11
3500 13
4000 14
5000 18
6000 21
8. For multiple boiler installations, multiply the number of
boilers by required free area per boiler.
9. The installation of exhaust fans in a boiler room is not
recommended.
10. 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. It is essential that only
fresh air is allowed to enter the combustion air system.
Foreign substances, such as combustible volatiles in the
combustion system can create hazardous conditions.
If foreign substances can enter the air stream, the
boiler combustion air inlet must be piped to an outside
location. Failure to do so will void the warranty.
Drastic draft changes during operation may result in
generation of excessive carbon monoxide or soot. To
decrease termination noise, increase the venting size
at the termination points. This will slow the air velocity
causing a reduction in noise. Do not terminate the
venting in an enclosed area. Care must be taken when
selecting the orientation of the terminations.
NOTE: ´ Consult your venting pipe supplier for assistance
with sizing of vent materials and other potentially required
accessories.
3. Do not use boot tees or bullhead tees.
4. Barometric dampers should never be used in a
condensing boiler application even if the draft is
negative, this is because barometric dampers physically
open to the mechanical room and it will be possible for
ue gas condensate to drain down the outside of the
stack.
5. The air intake system must be designed to prevent any
moisture from draining to the boiler.
6. The layout of the piping used for air intake and exhaust
must be done in a way that facilitates smooth travel and
natural ow. Performing a pressure drop calculation
isn’t enough information to make sure a draft system
will perform adequately. Good practice must be used
by the designer and installer. Some recommendations:
§ Avoid sharp turns, boot tees, bullhead tees,
back-to-back 90 degree elbows, short radius
elbows especially right at the connections
to the boilers
§ Avoid extensive direction changes ( ue
gases being required to turn around)
§ Never direct ue stacks in a downward
direction.