UTICA BOILERS MAH-125 Installation, Operation And Maintenance Manual page 34

FIGURE 6-16 - Flue Terminal Location
All vent pipe and combustion air pipe and fittings shall comply with the following:
Materials used in the U.S. must comply with the following standards:
ANSI/ASTM D1785, ANSI/ASTMD2661, ANSI/ ASTM F441.
D
E
B
L
A Clearance above grade, veranda, porch, deck, or balcony
B
Clearance to window or door that may be opened
C
Clearance to permanently closed window
Vertical Clearance to ventilated soffit located above the terminal within a
D
horizontal distance of 2 feet (610 mm) from the center line of the terminal
E
Clearance to unventilated soffit
F
Clearance to outside corner
G
Clearance to inside corner
Clearance to each side of center line extended above meter/ regulator
H
assembly
I
Clearance to service regulator vent outlet
Clearance to non-mechanical air supply inlet to building or the combustion
J
air inlet
any other appliance
K
Clearance to mechanical air supply inlet
Clearance above paved sidewalk or paved driveway located on public
L
property
M
Clearance under veranda, porch, deck or balcony
† A vent shall not terminate directly above a sidewalk or paved driveway that is
located between two single family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck or balcony is fully open on a
minimum of one side beneath the floor.
Note:
Local Codes or Regulations may require different clearances. Flue terminal must be exposed to external air and position must
allow the free passage of air across it at all times. In certain weather conditions the terminal may emit a plume of steam. Avoid
positioning terminal where this may cause a nuisance.
6 - COMBUSTION AIR AND VENT PIPING
C
V
Fixed
Closed
V
F
Operable
B
V
VENT TERMINAL
Vent Termination Minimum Clearances
INSIDE CORNER
DETAIL
G
V
A
B
B
Operable
Fixed
Closed
B
V
V
J
AIR SUPPLY INLET
US Installations
12" (305mm)
12" (305mm)
*12" (305mm)
18" (457mm)
18" (457mm)
9" (229mm)
36" (456mm)
3 ft. (0.9m) within a height of 15 ft.
(4.5m) above the meter/ regulator
assembly
3 ft. (0.9m)
to 12" (305mm)
*3 ft. (0.9m)
*7 ft. (2.1m)
*12" (305mm) ‡
*For clearances not specified in ANSI Z223.1/NFPA 54 or
CSA B149.1, clearance will be in accordance with local
installation codes and the requirements of the gas supplier
and these installation instructions.
30
H
I
V
M
V
AREA WHERE TERMINAL IS
NOT PERMITTED
Canadian Installations
12" (305mm)
*12" (305mm)
18" (457mm)
18" (457mm)
36" (456mm)
3 ft. (0.9m)
3 ft. (0.9m)
3 ft. (0.9m)
6 ft. (1.8m)
7 ft. (2.1m) †
12" (305mm)‡
K
3 ft. (0.9m)
9" (229mm)