Reznor BE Unit Installation Manual - Manual (Page 10)

Form RZ-NA-I-FE/BE, Mfg P/N 98807 Rev 10, Page 9
Figure 9 - Horizontal Vent Terminals
Structure Minimum Clearances for Vent Termination
Location (all directions unless specified)
Forced air inlet within 10 ft (3.1m) 3 ft (0.9m) above
Combustion air inlet of another appliance 6 ft (1.8m)
Door, window, or gravity air inlet 4 ft (1.2m) horizontally
(any building opening) 4 ft (1.2m) below
3 ft (0.9m) above
Electric meter, gas meter * and relief equipment 4 ft (1.2m) horizontally
Gas regulator *
3 ft (0.9m)
Adjoining building or parapet 6 ft (1.8m)
Grade (ground level) 7 ft (2.1m) above
*Do not terminate the vent directly above a gas meter or service regulator.
Instructions for attaching double-wall (Type B) vent pipe to the
venter outlet, a single-wall pipe run, or to the vent cap (use
these instructions for either full length double-wall or termi-
nal only):
Hardware and Sealant Required: 3/4" long sheetmetal screws; and a
tube of silicone sealant
1) Look for the "flow" arrow on the vent pipe; attach according to the
arrow. Slide the pipe so that the venter outlet, the single-wall pipe, or
the vent cap is inside the double-wall pipe.
2) Drill a hole through the pipe into the outlet collar, the single-wall
pipe, or the vent cap. (Hole should be slightly smaller than the sheet
metal screw being used.) Using a 3/4" long sheet metal screw, attach
the pipe. Do not overtighten. Repeat, drilling and inserting two addi-
tional screws evenly spaced (120° a part) around the pipe.
3) Use silicone sealant to seal any gaps. If there is an annular opening,
run a large bead of sealant in the opening. The bead of sealant must be
large enough to seal the opening, but it is not necessary to fill the full
volume of the annular area.
5. Vent System Support
Support lateral runs every six feet, using a non-combustible material
such as strap steel or chain. Do not rely on the heater for support of
either horizontal or vertical vent pipe
6. Condensation
Single wall vent pipe exposed to cold air or run through unheated areas
must be insulated. Where extreme conditions are anticipated, install a
means of condensate disposal.
7. Vent Terminal (Pipe and Vent Cap)
The vent system must be terminated with a suitable vent cap that is the
same size as the vent run.
Heaters must be equipped with the heater manufacturer's vent cap, a
Type L Breidert Air-x-hauster
® vent cap, or equivalent. Use of a vent
cap supplied by the pipe manufacturer is not permitted; the vent cap
must be the type approved for use with this heater. A different style
vent cap could cause nuisance problems or unsafe conditions.
See the illustrations in Figures 9 and 10 for requirements of both verti-
cal and horizontal vent termination. The vent terminal section may be
either single-wall or double-wall (Type B) vent pipe. If double-wall
pipe is used in the vent terminal with a single-wall vent run, follow the
instructions in No. 4, Vent System Joints, to attach the vent cap and to
connect the double-wall pipe to the single-wall vent pipe run.
Roof or Building Overhang
3’ (1M) minimum
12”
(305mm)
minimum
6’ (2M)
minimum
Wall Parapet or
Adjoining Building
Approved clearance
thimble for single-wall
vent pipe is required
when flue pipe extends
through combustible
materials.
Note position of vent
cap openings.
Pitch flue pipe down toward outlet
1/4” per foot for condensate drainage.
(NOTE: Applies to entire horizontal
vent run.)
Adjoining Building
Parapet or
Roof or Building Overhang
6’ (2M)
minimum
3’ (1M) minimum 12”
(305mm)
minimum
Wall
Approved clearance
thimble is required
when flue pipe extends
through combustible
materials. Follow
the requirements
of the double-wall
pipe manufacturer.
Pitch flue pipe down toward
outlet 1/4” per foot for con-
densate drainage.
(NOTE: Applies to entire
horizontal vent run.)
Note position of
vent cap openings.
6” (152mm) minimum
Follow instructions above to join single
and double-wall pipe and to seal the connection.
Single-Wall Vent Run and Single-Wall Terminal End Single-Wall Vent Run and Double-Wall Terminal End
Horizontal Vent Terminal Clearances:
The location of the termination of the hori-
zontal vent system must be in accordance
with National Fuel Gas Code Z223.1. Re-
quired minimum clearances are listed on
the right.
Products of combustion can cause discol-
oration of some building finishes and dete-
rioration of masonry materials. Applying
a clear silicone sealant that is normally used
to protect concrete driveways can protect
masonry materials. If discoloration is an
esthetic problem, relocate the vent or in-
stall a vertical vent.