Vertical through the roof applications – Vermont Casting BHDT36 User Manual
Page 22
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TYPICAL STRAIGHT-UP INSTALLATION
40 FEET
(12.2m)
ATTIC INSULATION
SHIELD
JOISTS
ROOF
VENT TERMINATION
ATTIC INSULATION
ROOF SUPPORT
STORM COLLAR
ROOF FLASHING
2' Min.
CEILING JOISTS
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. 48).
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.(3048mm) horizontal vent run can be
installed within the vent system using a maximum of
three 90
°
elbows.
b) Up to two 45
°
elbows may be used within the horizontal
run. For each 45
°
elbow used on the horizontal level
the maximum horizontal length must be reduced by 18
inches (457mm).
Example: Maximum horizontal length
0
-
45
°
elbows 10 ft. (3048mm)
1
-
45
°
elbows 8.5 ft. (2590mm)
2
-
45
°
elbows 7 ft. (2133mm)
Fig. 49
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.
(2438mm) a vent pipe can be used between elbows.
(Fig. 50)
e) 7DVCS must be used to support offsets. (Fig. 51)
This application will require that you first determine the roof
pitch and use the appropriate 7TDVSKV (A,B or F). (see
Venting Components, page 24)
Fig. 48
Fig. 52
TYPICAL 7DVCS
APPLICATION
TYPICAL ROOF
SUPPORT
APPLICATION
Fig. 53
Fig. 50
Clearance above a roof shall extend a
minimum of 24" (610mm) above the
highest point when it passes through
the roof surface, and any other
obstruciton within a horizontal dis-
tance of 18" (450mm).
Fig. 51
MAXIMUM
10 FT
(3048mm)
PIPE STRAPS
EVERY 3’
(914mm)
MINIMUM
8 FT./
MAXIMUM
40 FT.
VERTICAL
RISE
45°
45°
2438mm
MAX.
8 FEET
2438mm
MAX.
8 FEET
TYPICAL OFFSET INSTALLATION
40 FEET
(12.2m)