Vermont Casting DVRSR - Manual (Page 15)

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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. 26).
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 90º elbows.
b) Up to two 45º elbows may be used within the horizontal
run. For each 45º elbow used on the horizontal level
the maximum horizontal length must be reduced by 18
inches (457mm).
Example: Maximum horizontal length
0 - 45º elbows 10 ft. (3048mm)
1 - 45º elbows 8.5 ft. (2590mm)
2 - 45º elbows 7 ft. (2133mm)
MAXIMUM
10 FT. (3408mm)
MINIMUM 8 FT.
MAXIMUM 40 FT.
VERTICAL RISE
PIPE STRAPS
EVERY 3 FT. (914mm)
Fig. 27
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. 30)
Fig. 26
f) 7DVCS must be used to support offsets. (Fig. 30).
This application will require that you first determine the roof
pitch and use the appropriate 7DVSKV (A,B or F). (see
Venting Components, page 17)
e) The maximum number of elbow degrees in
system is 270º (this does not include transition
elbow from rear vent to vertical vent).
Fig. 28
Sample: 1 - 90º
2 - 45º
3 - 45º
4 - 45º
5 - 90º
Total - 270º