Fulton Pulse DWH (PDWH) Domestic Water Heater - Manual (Page 20)

Installation
Typical Ceiling and Roof Penetration Detail
18-PDWH
Figure 8
Air Intake Supply and
Exhaust Vent
Installation
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.
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.
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.
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 in an opening providing 5" or 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