Detroit Radiant Products Company QTD Series - Manual (Page 18)

QTD Series
18
3.0 Installation • Venting
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 manual and
applicable national, state, provincial and local codes.
This radiant tube heater must be vented in accordance with the requirements within this manual and all
applicable codes for all models, prior to operating unit. Local codes may vary.
In the absence of local codes:
United States: Refer to NFPA 54/ANSI Z223.1 (latest edition), National Fuel Gas Code.
Canada: Refer to CAN/CGA B149.1 Installation Code for Gas Burning Appliances.
The heating system may operate either vented or unvented. Venting can terminate through the sidewall
(horizontal) or the roof (vertical) and be individually or commonly vented.
Venting Requirements
• 4 in. single wall 26 gauge (min.) galvanized steel vent pipe or Dura/Connect single wall flexible
exhaust vent must be used.
• Maximum vent length for all models is 30 ft. (9 m).
• Single wall galvanized vent pipe must be insulated in cold environments.
• Seal single wall vent with high temperature sealant (field supplied)and three (3) #8 sheet metal
screws (field supplied).
• Do not use more than two (2) 90° 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 3.11 - 3.14).
• Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12.
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