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TABLE 3
VERTICAL VENT REQUIREMENTS
FLUE TYPE MODEL INSTALLATION
AIR INLET TYPE
FLUE
DIA.
AIR
INLET
DIA.
VENT CAP OTHER
SINGLE WALL 45 COMMERCIAL
or
RESIDENTIAL
SINGLE WALL or
METAL FLEX VENT
3” 3” U.L. APPROVED MAY USE ONE
SECTION OF B-
VENT
TYPE B VENT 45 COMMERCIAL
or
RESIDENTIAL
SINGLE WALL or
METAL FLEX VENT
3” 3” U.L. APPROVED
CONCENTRIC 45 COMMERCIAL
or
RESIDENTIAL
SINGLE WALL or
METAL FLEX VENT
3” 3” 4” CONCENTRIC
VENT/ ADAPTER/CAP
KIT REQUIRED
SINGLE WALL 60, 75 COMMERCIAL
or
RESIDENTIAL
SINGLE WALL or
METAL FLEX VENT
4” 4” U.L. APPROVED MAY USE ONE
SECTION OF B-
VENT
TYPE B VENT 60, 75 COMMERCIAL
or
RESIDENTIAL
SINGLE WALL or
METAL FLEX VENT
4” 4” U.L. APPROVED
CONCENTRIC 60, 75 COMMERCIAL
or
RESIDENTIAL
SINGLE WALL or
METAL FLEX VENT
4” 4” 4” CONCENTRIC
VENT/ ADAPTER/CAP
KIT REQUIRED
SINGLE WALL 100, 125 COMMERCIAL
or
RESIDENTIAL
SINGLE WALL or
METAL FLEX VENT
5” 4” U.L. APPROVED MAY USE ONE
SECTION OF B-
VENT
TYPE B VENT 100, 125 COMMERCIAL
or
RESIDENTIAL
SINGLE WALL or
METAL FLEX VENT
5” 4” U.L. APPROVED
CONCENTRIC 100, 125 COMMERCIAL
or
RESIDENTIAL
SINGLE WALL or
METAL FLEX VENT
5” 4” 5” CONCENTRIC
VENT/ ADAPTER/CAP
KIT REQUIRED
FIGURE 6
HORIZONTAL VENTING - RESIDENTIAL INSTALLATION
LISTED THIMBLE
THROUGH
COMBUSTIBLE WALL
GROUND LEVEL
NOTE - MINIMUM HORIZONTAL LENGTH 3 FT. (91.4 CM) NOT
INCLUDING TERMINATION. MAXIMUM HORIZONTAL VENT
LENGTH 5 FT. (1.5M) PLUS ONE 90-DEGREE ELBOW.
MAY BE SINGLE WALL (26 GSG) GALV. OR EQUIVALENT STAINLESS STEEL SEALED ACCORDING TO THESE INSTALLATION
INSTRUCTIONS OR A SINGLE SECTION OF TYPE B-1 VENT. SLOPE:+ 1/4 INCH FOR 1 FOOT RUN MINIMUM.
UPWARD SLOPE
COMMON VENTING NOT ALLOWED WHEN HORIZONTALLY VENTING THE UNIT HEATER.
VENT TERMINATION
12” (30.5 CM) MIN. FROM WALL TO
VENT TERMINATION
12” (30.5 CM) MINIMUM ABOVE
HIGHEST SNOWFALL
(TERMINATIONS MAY
USE WIRE MESH BIRD
SCREEN)
AIR INLET
TERMINATION
12” (30.5 CM) MIN. FROM
AIR INLET TO VENT
TERMINATION (MAY
BE HORIZONTAL OR
VERTICAL CLEARANCE)