24
Venting
WARNING
!
Insufficient ventilation and/or improperly sealed vents may release gas into the building
which could result in health problems, carbon monoxide poisoning or death.
Improper venting may result in fire, explosion, injury or death.
Seal vent pipes with high temperature sealant and three (3) #8 sheet metal screws.
Vent enclosed spaces and buildings according to the guidelines in this insert manual
and applicable national, state, provincial and local codes.
3.0
Installation
•
Venting
The heating system may operate either vented or unvented (see page 28). Venting can terminate through
the sidewall (horizontal) or the roof (vertical) and be individually or commonly vented.
Follow these guidelines and all applicable codes for all models, prior to installing vent material. Local
codes may vary. In the absence of local codes, refer to and comply with the National Fuel Code ANSI
Z223.1 (NFPA 54) latest edition or the National Standards of Canada.
Venting Requirements
• 4 in. single wall galvanized steel vent pipe or Dura/Connect single wall flexible exhaust vent must
be used.
• Secure vent pipe to the swaged exhaust end of tube exchanger using three (3) #8 x 3/8 sheet
metal screws (field supplied). Seal with high temperature silicone sealant (field supplied).
NOTE
: Tube clamps provided in kit are not to be used for this connection.
• Seal single wall vent joints with high temperature sealant (field supplied) and three (3) #8 sheet
metal screws (field supplied).
• Single wall galvanized vent pipe must be insulated in cold environments.
• Do not use more than two 90 degree elbows in the exhaust vent.
• To maintain clearances to combustibles, the use of an approved wall or roof thimble and double-
wall Type-B vent is required for the portion of vent pipe that runs through combustible material in
the building wall or roof (see figures 3.21 & 3.22).
• Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12.
• Maximum vent length for all models is 20ft. (6 m).
• Maintain a 36” minimum distance from vent to combustion air intake on heaters fitted with a U-bend
accessory fitting.
