PRE-INSTALLATION PREPARATION
Continued
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| Fixed |
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B
B
B
Openable Fixed Closed
H
V
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I
V J XG
AM
NN
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| V |
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V K X | V |
| A |
V TERMINATION CAP | X AIR SUPPLY INLET | G GAS METER |
RESTRICTED AREA 
(TERMINATION PROHIBITED)
A = | clearance above grade, veranda, porch, deck, or balcony | I | = | clearance to service regulator vent outlet [*72 inches (182.9cm) |
| [*12 inches (30.5cm) minimum] |
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| minimum] |
B = | clearance to window or door that may be opened | J | = | clearance to |
| [12 inches (30.5cm) minimum] |
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| combustion air inlet to any other fireplace [*12 inches (30.5cm) |
C = | clearance to permanently closed window [minimum 12 inches |
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| minimum] |
| (30.5cm) recommended to prevent condensation on window] | K | = | clearance to a mechanical air supply inlet [*72 inches (182.9cm) |
D = | vertical clearance to ventilated soffit located above the terminal |
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| minimum] |
| within a horizontal distance of 24 inches (61cm) from the | L | = | † clearance above paved |
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| public property [*84 inches (213.4cm) minimum] | |
E = | clearance to unventilated soffit [12 inches (30.5cm) minimum] | M = | clearance under veranda, porch, deck [*12 inches (30.5cm) minimum ‡] | |
F = | clearance to outside corner (see below) | N = | clearance above a roof shall extend a minimum of 24 inches (61cm) | |
G = | clearance to inside corner (see below) |
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| above the highest point when it passes through the roof surface and |
H = | *not to be installed above a meter/regulator assembly within |
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| any other obstruction within a horizontal distance of 18 inches (45.7cm) |
| 36 inches (91.4cm) horizontally from the |
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†vent shall not terminate directly above a
single family dwellings and serves both dwellings*
‡only permitted if veranda, porch, deck or balconey is fully open on a minimum of 2 sides beneath the floor*
*as specified in CAN/SGA B149 (.1 or .2) Installation Codes (1991) for Canada or for U.S.A. installation follow
the current National Fuel Gas Code, ANSI Z223.1
Note: Local codes or regulations may require different clearances
Termination Clearances for Buildings with Combustible and Noncombustible Exteriors
Inside Corner
A
V
Outside Corner | Recessed Location |
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| D |
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| C | C |
A = 6" (15.2cm) |
| E |
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V | V |
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B | B = 6" (15.2cm) |
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Balcony with No Side Wall | Balcony with Perpendicular Side Wall |
G |
V |
G = Combustible 24" (61cm) Noncombustible 18" (45.7cm)
H 
V
J
Combustible &
Noncombustible
H = 24" (61cm)
J = 20" (50.8cm)
C = Maximum depth of 48" (121.9cm) for recessed location
D = Minimum width for back wall of recessed location - Combustible - 38" (96.5cm) Noncombustible - 24" (61cm)
E = Clearance from corner in recessed location- Combustible - 6" (15.2cm) Noncombustible - 2" (5.1cm)
Figure 5 - Minimum Clearances for Vent Terminations
6 | www.desatech.com |