Vent Termination Clearances - Superior SSDVST-CNM Installation Instructions Manual

VENT TERMINATION CLEARANCES

These instructions should be used as a guideline and do not supersede local codes in any
way. Install vent according to local codes, these instructions, the current National Fuel Gas
Code (ANSI-Z223.1) in the USA or the current standards of CAN/CGA-B149.1 and -B149.2 in
Canada.
Terminate multiple vent terminations according to the installation codes listed above.
Terminate single vent caps relative to building components according to Figure 4.
Vertical Vent Termination Clearances
TERMINATION HEIGHTS FOR VENTS ABOVE
FLAT OR SLOPED ROOFS
Horizontal Overhang
2 FT
MIN.
2 FT MIN.
Lowest
Discharge
Vent
Opening
Termination
H*
Storm Collar
Flashing
1 inch (25.4 mm) Minimum
Clearance to Combustibles
Concentric
*H = MINIMUM HEIGHT FROM ROOF TO
Vent Pipe
LOWEST DISCHARGE OPENING OF VENT
The vent / air intake termination clearances above the high
side of an angled roof is as shown in the following chart:
Figure 4 - Gas Vent Rule
Termination Heights For Vents
Above Flat Or Sloped Roofs
Ref. NFPA 54 / ANSI Z223.1, 7.6
Vertical Roof Pitch
Wall
Flat to 6/12
6/12 to 7/12
7/12 to 8/12
8/12 to 9/12
X
9/12 to 10/12
12
10/12 to 11/12
Roof Pitch is X/12
11/12 to 12/12
12/12 to 14/12
14/12 to 16/12
16/12 to 18/12
18/12 to 20/12
20/12 to 21/12
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Horizontal Vent Termination Clearances
The horizontal vent termination must have
a minimum of 3" (76 mm) clearance to any
overhead combustible projection of 2 1/2" (64
mm) or less. See Figure 5. For projections
exceeding 2 1/2" (64 mm), see Figure 5. For
additional vent location restrictions refer to
Figure 6 on Page 8.
Horizontal Vent Termination Clearances
Combustible Projection greater
than 2-1/2 inches in length
Ventilated
* Feet * Meters
Soffit
1.0 0.3
1.25 0.38
18"
(457 mm)
1.5 0.46
2.0 0.61
2.5 0.76
Note - See Figure 34 on
Page 20 for the exterior
3.25 0.99
wall recess allowances
of the square horizontal
4.0 1.22
termination.
5.0 1.52
6.0 1.83
Figure 5
7.0 2.13
7.5 2.29
8.0 2.44
Combustible Projection
2-1/2 inches or less in length
Unventilated
Soffit
3"
12"
(76 mm)
(305 mm)
Termination Kit
Side Elevation View
7