Dunkirk DCC-150 - External Low Water Cut Off (LWCO)

30
FIGURE 6-16 - Flue Terminal Location
All vent pipe and combustion air pipe and ttings 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.

INSIDECORNER 
DETAIL 
G
V
H
D
A
E
B
L
C
B

V
B

Closed
V
I
V
F
V

Closed

Operable
Operable
M
V
B
V
K
J
B

VENTTERMINAL 
 

NOT 
Vent Termination Minimum Clearances
US Installations Canadian Installations
A
Clearance above grade, veranda, porch, deck, or balcony 12" (305mm) 12" (305mm)
B
Clearance to window or door that may be opened 12" (305mm) 3 ft. (0.9m)
C
Clearance to permanently closed window *12" (305mm) *12" (305mm)
D
Vertical Clearance to ventilated soft located above the terminal within a
horizontal distance of 2 feet (610 mm) from the center line of the terminal
18" (457mm) 18" (457mm)
E
Clearance to unventilated soft 18" (457mm) 18" (457mm)
F
Clearance to outside corner 9" (229mm) 9" (229mm)
G
Clearance to inside corner 36" (456mm) 36" (456mm)
H
Clearance to each side of center line extended above meter/ regulator
assembly
3 ft. (0.9m) within a height of 15 ft.
(4.5m) above the meter/ regulator
assembly
3 ft. (0.9m)
I
Clearance to service regulator vent outlet 3 ft. (0.9m) 3 ft. (0.9m)
J
Clearance to non-mechanical air supply inlet to building or the combustion
air inlet to
any other appliance
12" (305mm) 3 ft. (0.9m)
K
Clearance to mechanical air supply inlet *3 ft. (0.9m) 6 ft. (1.8m)
L
Clearance above paved sidewalk or paved driveway located on public
property
*7 ft. (2.1m) 7 ft. (2.1m) †
M
Clearance under veranda, porch, deck or balcony *12" (305mm) ‡ 12" (305mm)‡
† A vent shall not terminate directly above a sidewalk or paved driveway that is
located between two single family dwellings and serves both dwellings.
*For clearances not specied 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.
‡ Permitted only if veranda, porch, deck or balcony is fully open on a
minimum of one side beneath the oor.
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