29
CL3
Series
3.0
Installation
•
Horizontal Venting (Category III)
Vent Locations and Clearances:
• 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 3 feet above any forced air inlet that is located within 10 feet.
• The bottom of the vent terminate must be located a minimum of 12 inches above grade level and
must extend beyond any combustible overhang. Vents adjacent to public walkways must
terminate a minimum of 7 feet above grade level.
• 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.
Never join two sections of double wall vent pipe within one horizontal vent system as it is impossible to
verify that inner pipes are completely sealed.
*Vent must extend beyond any combustible overhang if the vent is less than 36 in. below the combustible
overhang.
Building Overhang*
Sidewall
Double-Wall
B Vent
Single-Wall
Vent
Wall Thimble
Sidewall Vent Cap
6 in.
min.*
B to C Adapter
Heater
1/4 in. downward
pitch per foot
36 in.
min.*
Figure 3.20
•
Sidewall Venting Requirements
