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25
LD3
Series
3.0
Installation
•
General Venting Requirements
Figure 3.17
•
General Venting Requirements
*Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12
24 in.
Min.*
Double-Wall B Vent
Roof*
Heater
1 in. Minimum Clearance -
Use Attic Insulation Shield
(Field Supplied)
Fire Stop Spacer
#8 Sheet Metal Screws (field supplied)
Adjustable Roof Flashing
Storm Collar
B to C Adapter
Clean Out Tee Fitting
Vent Cap
Clean Out Cap
• Avoid using more than two 90° directional changes in the venting system.
• Suspend and secure all horizontal runs at points no greater than 3 feet apart.
• Vent termination must maintain a minimum distance of 6 feet from any mechanical air supply inlet.
• Vent must terminate a minimum of 4 feet below, 4 feet horizontally from, or 1 foot above any window
or door that may be opened or gravity air inlet into the building.
• Vent must terminate a minimum of 4 feet above grade level and must extend beyond any
combustible overhang. Vents adjacent to the public walkways must terminate a minimum of 7 feet
above grade level.
• The vent terminal must be installed to prevent any blockage by snow and protect building material
from degradation by flue gases.
• The vent cap must be a minimum of 6 inches from the sidewall of the building.
• Vent must be a minimum of 36 inches below or extend beyond any combustible overhang.
• Consult NFPA ANSI Z223.1 Gas Vent Termination criteria for vents that terminate on a roof pitch that
exceeds 9:12.
•
Canada:
Vents must terminate a minimum of 3 feet from a window or door that may be opened, and
a non-mechanical air supply inlet or combustion air inlet into the building.
Содержание LD3-15-40
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