Vent/Air-Inlet Termination Clearances - Slant/Fin CHS-85 Installation And Operating Instructions Manual

CHS Series

5.0 VENT/AIR-INLET TERMINATION CLEARANCES

The quick reference table below is to be read in conjunction with the numbered notes as
indicated, Figures 5-1 and 5-2, and the Venting Rules and Guidelines in Section 4.0. The
instructions detailed in this section are a combination of CHS specific and National Gas Code restrictions.
Compliance alone doesn't insure a satisfactory installation as good common sense must also be applied. Failure
to follow these instructions may result in fire, property damage, serious injury or death.
Table 5-1 Termination Clearances Quick Reference Table (See Figures 5-1 and 5-2)
Clearances to Air-Inlet Termination
A Above grade/roofline and snow level
B Above roof line - Concentric Vent
C To exhaust vent from any other boiler
Clearances to Exhaust Vent Termination
D Minimum vertical separation above air inlet
E Minimum horizontal separation from air inlet
F Window, door or building opening
G To combustion air inlet from any other boiler
H Non-mechanical air supply inlet to building
I Mechanical air supply inlet to building
J Soffit, overhang, eave or parapet
K Soffit vent or vent opening in an overhang, eave or parapet
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L Outside corner
M Inside corner of an L-shaped structure (including walls and fences)
N Electric meters, gas meters, regulators and relief equipment
P Each side of center line above or below meters, regulators and relief devices
Q Above a paved sidewalk, driveway, or parking lot on public property if adjacent
R Above a sidewalk, driveway, or parking lot on public property
S Above a sidewalk, driveway on private property between / serving both dwellings
T Under a concrete veranda, porch, deck, or balcony
U Above, under or near exterior stairs
V Into a canopy or carport
Notes:
1 - Canadian installations must comply with the current CSA B149.1 Natural Gas and Propane Installation Code and local
building codes.
2 - US installations must comply with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code and local building codes.
3 - Horizontal separation center-to-center (c.c.) 4"-12" (102-305 mm).
4 - For US installations, an exhaust vent may be 3 ft above a mechanical air supply inlet if within 10 ft. [3 m] horizontally.
5 - Horizontal clearance must be observed up to a height of 15 ft. [4.6 m] above/below the meter, regulator, or relief devices
6 - Concentric Vent must protrude from the roof precisely 24" [610 mm] measuring from the terminal end-cap vanes.
7 - Permitted if veranda, porch, deck, or balcony is made of concrete and a minimum of two sides are fully open beneath.
8 - 24" is the recommended snow level allowance above grade/roofline or any surface that will support snow, debris, or ice
(i.e. for roof venting clearances - roofline and snow level). If living in a snowfall region, consult your local weather
office for the maximum typical snowfall for your area.
9 - Note that the vent must maintain a minimum vertical distance above the air-inlet. Example: Vent height = 18" (457
mm) above air inlet + 12" (305 mm) for air inlet above grade/roof line and snow level = 30" (762 mm) above grade and
snow level.
10 - Clearances to an outside corner to be in accordance with local installation codes.
11 - In Canada, concentric vent materials are subject to approval by local inspectors. See Termination Kits in Section 4.0.
12 - Above public walkways, driveways or parking lots if adjacent to it and condensate cannot drip, freeze, or create a hazard.
13 - Contact the manufacturer for special exemptions relating to multiple boiler installations using concentric vents.
- Not permitted by National gas code(s) and/or recommended by boiler manufacturer.
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Slant Fin Corp.
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Canada
Min. Distance Min. Distance
12 in. 305 mm 12 in.
24 in. 610 mm 24 in.
36 in. 915 mm 12 in.
Min. Distance Min. Distance
18 in. 457 mm 18 in.
4 in. 102 mm
36 in. 915 mm 12 in.
36 in. 915 mm 12 in.
36 in. 915 mm 12 in.
6 ft. 1.83 m
24 in. 610 mm 24 in.
1.83 m
6 ft.
- -
36 in. 915 mm 36 in.
6 ft. 1.83 m
5
36 in. 915 mm 36 in.
12
7 ft. 2.13 m
X X
X X
24 in. 610 mm 24 in.
X X
X X
2
USA
305 mm
610 mm
305 mm
457 mm
4 in. 102 mm
305 mm
305 mm
305 mm
3 ft. 915 mm
610 mm
6 ft. 1.83 m
- -
915 mm
4 ft. 1.22 m
915 mm
7 ft. 2.13 m
X X
X X
610 mm
X X
X X
.
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