Procom GHBVN50 Manual page 7

7. The vent connector shall be supported without any dips or sags. Vertical vents shall be supported in accordance
with their listing and manufacturers' instructions. All horizontal vent connector runs shall have a slope up to the
vertical vent of at least 1/4" per foot (1mm per 50mm).
8. All vertical type B−1 vents, single wall vents, or listed chimney lining system must be terminated with a listed vent
cap or listed roof assembly.
9. The vent must extend at least 3 feet (1m) above the highest point where it passes through a roof of a building and
at least 2 feet (1m) higher than any part of a building within a horizontal distance of 10 feet (3m) unless otherwise
specified by the current editions of the ANSI Z223.1 or CSA−B149 for installation compliance codes. The vent
must extend at least 5 feet (2m) above the highest connected equipment flue collar.
HORIZONTAL VENTING – GENERAL
NOTE: Common venting is not allowed when horizontally venting the
unit heater. The minimum horizontal vent length is 3 feet (1m).
1. If possible, do not terminate the horizontal vent through a wall that
is exposed to prevailing wind.
2. Exposure to excessive winds can affect unit performance. If such
a termination is necessary, use a wind block to protect the
vent termination from direct winds.
3. Vent termination must be free from obstructions and at least 12"
(305mm) above grade level and maximum snow height.
4. Do not terminate vent directly below roof eaves or above a walkway,
or any other area where condensate dripping may be troublesome
and may cause some staining. Avoid windows where steam may
cause fogging or ice buildup.
5. When horizontally vented, minimum clearance for termination from
any door, window, gravity air inlet, gas or electric meter, regulators,
and relief equipment is 4 feet (1m) for United States installations.
Refer to latest editions of the ANSI Z223.1 or CSA−B149 for
installation compliance codes and with local authorities with
jurisdiction.
In Canada, vent termination must have a minimum 6−foot (2m)
horizontal clearance from gas and electric meters and relief
devices as specified in the CSA−B149.
6. Vent termination must be a minimum of 4 feet (1m) below, or 4 feet
(1m) horizontally from any soffit or under-eave vent.
7. Vent must be a minimum of 6 feet (2m) from an inside corner
formed by two exterior walls. If possible, leave a 10−foot (3m)
clearance.
8. Vent termination must be a minimum of 10 feet (3m) from any forced
air inlet (includes fresh air inlet for other appliances, such as a
dryer.
9. When termination is routed through combustible wall, vent
termination must be supported using a firestop to maintain
clearances specified on unit rating plate. Where local authorities
permit, a B-1 vent insert may be used as an alternative to the
firestop. Refer to figure 3 for additional notes regarding B vent.
Inside edge of vent termination must be at least 12" (305mm) from
outside wall.
10. All horizontal vents must terminate with a tee. Opening end must
face downward. Addition of 1/4" (6mm) mesh material as a
bird screen in the tee openings may be used.
11. For horizontal venting, the vent pipe shall be supported with
hangers no more than 3 feet (1m) apart to prevent movement after
installation.
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Fig.3