Page 26
Modulating Unitary Range
VA-LT206_11292016al
VENTING AND COMBUSTION AIR DUCTING
Figure 26: Common Horizontal Venting
Common Horizontal Venting
•
All heaters connected to a common horizontal vent must operate at the same time. Connect the
electrical circuit to the same thermostat to ensure simultaneous operation.
•
Fresh air supply CANNOT supply other burner systems.
•
Refer to Figure 26 for detailed common horizontal venting guidelines.
COMMON VENTING FOR HEATERS
WITH A COMBINED TOTAL INPUT OF UP TO 250,000 BTU
COMMON VENTING FOR HEATERS
WITH A COMBINED TOTAL INPUT OF 250,000 BTU OR GREATER
TOTAL VENT LENGTH FOR
SINGLE WALL VENTING
(INCLUDING ELBOWS) = 40'
EACH ELBOW = 5'
MAX. NUMBER OF ELBOW = 3
TOTAL VENT LENGTH FOR
SINGLE WALL VENTING
(INCLUDING ELBOWS) = 40'
EACH ELBOW = 5'
MAX. NUMBER OF ELBOW = 3
24 GSG VENT
MATERIAL
24 GSG VENT
MATERIAL
5' MAX
5' MAX
FOR COMBUSTIBLE
WALLS
4" WALL THIMBLE
PN V-CS006
6" WALL THIMBLE
PN V-CS033
4" VENT
TERMINAL
PN V-0700
18" MIN
18" MIN
6" VENT
TERMINAL
PN V-0700
WALL
WALL
NOTES: (FOR HORIZONTAL VENTING)
1.
USE 4" SINGLE WALL VENT WITH HEATERS OF COMBINED INPUT OF UP TO 250,000 BTU AND 6"
FOR A COMBINED TOTAL INPUT OF 250,000 BTU OR GREATER.
2.
WALL THIMBLES AND VENT TERMINALS MUST BE USED WITH SINGLE WALL HORIZONTAL
VENTING THROUGH COMBUSTIBLE WALLS. WALL THIMBLE MAY BE REPLACED BY FLASHING
WHERE THE VENT IS PENETRATING A NON-COMBUSTIBLE WALL.
