Vermont Casting BHDR36 - Manual (Page 24)

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DO NOT BACK FILL AROUND SNORKEL.
SOIL SHOULD NOT BE LESS THAN 4"
BELOW SNORKEL.
FOUNDATION
RECESS
SNORKEL
SCREWS
WALL
SCREWS
SHEET METAL
WATERTIGHT
SEAL
AROUND
PIPE
If the foundation is recessed, use recess brackets (not
supplied) for securing lower portion of the snorkel. Fasten
brackets to wall first and then secure to snorkel with self
drilling #8 x 1/2 sheet metal screws. It will be necessary to
extend vent pipes out as far protruding wall face (Fig. 57).
Fig. 57
MAXIMUM
10 FT
(3048mm)
PIPE STRAPS
EVERY 3'
(914mm)
MINIMUM
8 FT./
MAXIMUM
40 FT.
VERTICAL
RISE
VERTICAL THROUGH THE
ROOF APPLICATIONS
This Gas Fireplace has been approved for,
a) Vertical installations up to 40 feet (12 metres) in height.
Up to a 10 ft. horizontal vent run can be installed within
the vent system using a maximum of three 90
o elbows.
b) Up to two 45 o elbows may be used within the horizontal
run. For each 45 o elbow used on the horizontal level
the maximum horizontal length must be reduced by 18
inches.
Example: Maximum horizontal length
0 - 45 o elbows 10 ft.
1 - 45 o elbows 8.5 ft.
2 - 45 o elbows 7 ft.
Fig. 58
Fig. 62
The minimum height of the vent above the highest
point of penetration throught the roof is 2 feet. See
Fig. 62.
ATTIC INSULATION
SHIELD
JOISTS
ROOF
VENT TERMINATION
ATTIC INSULATION
ROOF SUPPORT
STORM COLLAR
ROOF FLASHING
24" Min.
(610mm)
CEILING JOISTS
40 FEET
(12.2m)
TYPICAL STRAIGHT-UP INSTALLATION
)
TYPICAL 7DVCS
APPLICATION
TYPICAL ROOF
SUPPORT
APPLICATION
Fig. 59
Fig. 60
Fig. 61
c) A minimum of an 8 ft. vertical rise.
d) Two sets of 45 degree elbow offsets within these
vertical installations. From 0 to a maximum of 8 ft. a
vent pipe can be used between elbows. (Fig. 59)
e) 7DVCS must be used to support offsets. (Fig. 60)
This application will require that you first determine the roof
pitch and use the appropriate 7TDVSKV (A,B or F). (see
Venting Components, page 27)
SIDE VIEW
MAX.
40 FEET
(12.2m)
MIN.
8 FEET
(2.44m)
MAX. 8 Ft.
(2438mm)
MAX. 8 Ft.
(2438mm)