FULTON PHW 1000, Installation, Operation And Maintenance Manual, Page: 41 / 94

Fulton Heating Solutions, Inc. -- PHW Manual -- 2010-0713
Page 41
f) If utilizing a common header pipe for multiple pulse boilers, the pressure drop across a
common intake pipe must be neutral. The pressure drop across a common vent pipe
must be between -0.1 and 0” W.C. if not utilizing a mechanical draft system.
22. Air Intake Supply and Exhaust Vent Installation
a) Air intake supply and exhaust vent pipes and fittings are suitable for vertical, through-the-
roof or horizontal through-the-wall installation. The vent system must be installed in
accordance with the manufacturer’s instructions.
b) 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. See Figure 8. The air space clearances should be observed to joists,
studs, subfloors, plywood, drywall or plaster enclosures, insulating sheathing, rafters,
roofing, and any other material classed as combustible.
c) The required minimum air space clearances also apply to electrical wires and any kind of
building insulation away from gas vent and out of the required air space clearance.
d) Vertical runs or vent pipes and fittings passing through floors, ceilings, or in framed walls
must be fire stopped at floors and ceilings. The fire stop must close in the area between
the outside of the vent and the opening in the structure. (Figure 9). When passing
through a floor or ceiling frame, provide an opening 5" to 9" air space clearance to vent
pipe as applicable. The fire stop fits to the bottom of a framed opening 13 1/4" square.
Nail into the inside of the framed opening through the four holes in the ring. The fire stop
is placed on top of a framed opening 14 1/4" square with the dished position down. Nail
the flange to the top of the framing.
e) Pass the vent pipe through the opening in the fire stop. If used as a support, install the
support ring around the vent pipe above the fire stop. Slide the support ring down to the
top of the fire stop and tighten it securely to the vent pipe. Firestop supports can support
up to 10 feet of vent pipes and are recommended at all floor and ceiling penetrations.
Figure 10. Air intake supply and exhaust vent pipes and fittings must be securely
supported. For pitched roofs refer to figure 12.
f) Horizontal sections require supports every 5 feet and at elbows. From the boiler, all
horizontal sections must rise at leas 1/4" per foot, and there must be no sags or dips
where condensate could collect. The upward pitch is required so condensate will run
back to the boiler for collection and disposal.
g) For vertical through the roof installations all gas vents extending above the roof by more
than 2 1/2 feet must be securely guyed or braced (inside and outside wall) 2 clamps. Use
a support ring to attach guys or braces to the vent pipe.