Hatco POWERMITE PMG-100 Installation, Operating, Service And Parts Manual page 22

INSTALLATION
2. The second method of venting is to directly
exhaust the flue products into the kitchen work
area provided the size and installation of the
open room meet the requirements of the National
Fuel Gas Code [ANSI Z223.1 or NFPA bulletin
#54]. A portion of the 1996 code is as follows.
EXCERPT FROM ANSIZ223.1/NFPA #54
7.2.1 Connection To Venting Systems. Excerpt as
permitted in 7.2.2 through 7.2.6, all gas utilization
equipment shall be connected to venting systems.
7.2.2 Equipment Not Required To Be Vented.
A single booster-type [automatic instantaneous] water
heater, when designed and used solely for the sanitizing
rinse requirements of a dishwashing machine, provided
that the equipment is installed, with the draft hood in
place and unaltered, if a draft hood is required in a
commercial kitchen having a mechanical exhaust
system. Where installed in this manner, the draft hood
shall not be less than 36 inches (91 cm) vertically and 6
inches (15 cm) horizontally from any surface other than
the equipment.
Where any or all of this equipment is installed so the
aggregate input rating exceeds 20 Btu per hr per cu ft
3
(207 watts per m ) of room space in which it is installed,
one or more shall be provided with venting systems or
other approved means for removing the vent gases to
the outside atmosphere so the aggregate input rating of
the remaining unvented equipment does not exceed the
20 Btu per hr per cu ft (207 watts per m
the room or space in which the equipment is installed is
directly connected to another room or space by a
doorway, archway, or other opening of comparable size
that cannot be closed, the volume of adjacent room or
space shall be permitted to be included in the
calculation.
Form No. PMG-100/200M-0805
Figure 9. Typical Through-the-Wall Venting
General Notes On Venting:
3
) figure. Where
20
• Whenever a vent pipe goes through a
combustible wall, the clearance between the
vent material and the combustible material
must be in accordance with the listing
requirements of the vent system chosen. See
the vent manufacturer's instructions.
• All horizontal runs of vent pipe must be
supported at every elbow and every 3 feet
(1 m).
• All horizontals must have an upward pitch of
at least 1/4" per foot.
• When venting through a side wall to the
outdoors the following must be observed:
• A vent termination [Tee Fitting] must be used
that is positioned with the backside of the
TEE at least 12" (305 mm) from the exterior
wall.
• The vent termination must be away from
areas where the general public will walk or
vehicle may damage the vent cap.
• The cap must be at least 3 feet (1 m) above
any forced inlet openings [into the building]
that are within 10 feet (3 m) of the cap.
• The cap must be one foot above any
windows, doors or other openings into the
building.