9
TABLE 6.2a: SUMMARY OF HORIZONTAL VENTING OPTIONS
VENT OPTION # 1 2 3 4 5
CLASSIFICATION USED IN THIS
MANUAL
HORIZONTAL
DIRECT VENT
HORIZONTAL
DIRECT VENT
(RESERVED
FOR FUTURE
USE)
(RESERVED
FOR FUTURE
USE)
(RESERVED
FOR FUTURE
USE)
ILLUSTRATED IN FIGURE 6.1 6.1
VENT PIPE STRUCTURE
PENETRATION
WALL WALL
AIR INTAKE PIPE STRUCTURE
PENETRATION
WALL WALL
VENT PIPE SIZE
3” 4”
AIR INTAKE PIPE SIZE 4” 4”
MAXIMUM VENT PIPE
LENGTH
BWC150 55 FT
N.R.
BWC225 N.R.
55 FT
MAXIMUM INTAKE
PIPE LENGTH
BWC150 60 FT N.R.
BWC225 N.R. 60 FT
EXHAUST TERMINAL
3” 90 ELBOW
OR TEE
4” 90 ELBOW
OR TEE
AIR INTAKE TERMINAL 4” 90 ELBOW 4” 90 ELBOW
VENT MATERIAL
APPROVED VENT SYSTEM
SHOWN IN TABLE 6.5
AIR INTAKE MATERIAL GALVANIZED OR PVC
“N.R” - Not recommended “N.A.” - Not applicable
• Maintain the correct clearance and orientation between the vent and air intake terminals. The vent and air intake
terminals must be at the same height and their center lines must be between 12 and 36 inches apart. Both terminals
must be located on the same wall.
• The bottom of the vent and air intake terminals must be at least 12” above the normal snow line. In no case should
they be less than 12” above grade level.
• The bottom of the vent terminal must be at least 7 feet above a public walkway.
• Do not install the vent terminal directly over windows or doors.
• The bottom of the vent terminal must be at least 3 feet above any forced air inlet located within 10 feet.
• A clearance of at least 4 feet horizontally must be maintained between the vent terminal and gas meters, electric
meters, regulators, and relief equipment. Do not install vent terminal over this equipment.
• Do not locate the vent terminal under decks or similar structures.
• Top of vent terminal must be at least 5 feet below eves, soffits, or overhangs. Maximum depth of overhang is 3 ft.
• Vent terminal must be at least 6 feet from an inside corner.
• Under certain conditions, water in the flue gas may condense, and possibly freeze, on objects around the terminal
including on the structure itself. If these objects are subject to damage by flue gas condensate, they should be
moved or protected.
