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The maximum horizontal vent run is 20 feet (6100mm)
when the vertical vent rise is 7.5 feet (2286mm). Fig. 14
Since it is very important that the venting system
maintain its balance between the combustion air intake
and the flue gas exhaust, certain limitations as to vent
configurations apply and must be strictly adhered to.
The graph showing the relationship between vertical and
horizontal side wall venting will help to determine the
various vent lengths allowable. Fig. 19.
Minimum clearance between vent pipes and
combustible materials is one (1") inch (25
mm) on top, bottom and sides unless
otherwise noted.
When vent termination exits through
foundation less than 20" below siding outcrop,
the vent pipe must flush up with the siding. A
7DVSS must also be used.
It is always best to locate the fireplace in such a way that
minimizes the number of offsets and horizontal vent
length.
The horizontal vent run refers to the total
length of vent pipe from the flue collar of the
fireplace to the face of the outer wall.
Horizontal plane means no vertical rise
exists on this portion of the vent assembly.
For some installations, it may be desireable
to have some amount of the horizontal vent
run immediately after the fireplace. A verti-
cal rise must be used but can be located
anywhere in the vent system, to meet the
perimeters identified in the venting graph.
7.5'
90"
(2286mm)
20ft.
(6100mm)
48"
(1220mm)
(305
mm)
12"
15ft.
(4572
mm)
VENT
TERMINATION
MAXIMUM
SIDE VIEW
7DVT90
ELBOW
Vertical Dimension
8ft. minimum when
horizontal run is
20 ft.
#8
SCREWS(2)
ADJUSTABLE ZERO
CLEARANCE SLEEVE
ADJUSTABLE
ZERO CLEARANCE
SLEEVE
#8
SCREWS(2)
#8
SCREWS(2)
Maximum Length
12" (294mm)
FIRESTOP
Fig. 12
STEP 4
Slip 4" and 7" pipes onto respective flue collars. Make sure
to fix to the fireplace collar the 4" pipe with three (3) screws
before fixing the 7" pipe on the 7" collar. Both pipes must
be on a level plane. Fig. 13.
STEP 3
Measure from fireplace collar to face of outside wall (add 2"
for vent pipe overlap. Mark pipes and cut to length. It is very
important that the two pipes are flush with the outside wall
once the fireplace is in its final location. Fig. 13.
STEP 5
Guide the vent termination 4" collar into the 4" pipe then the
7" collar into the 7" pipe. Do not force the venting into
position. If the pipes do not line up with the termination
collars, disassemble pipes and reattach to the fireplace
collar. (Fig. 13)
STEP 6
Secure fireplace to floor through floor holes and adjustable
frame drywall strip (nailing flange) to frame. (See Framing
& Finishing Section)
Fig. 13
Vent Starter Kit 7DVSK, plus Transition Elbow
7DVRT90 must be used in Vertical Sidewall
installations.
The 4" pipe must be centred
inside the 7" pipe coming off the 7DVRT90
transition elbow.
VERTICAL SIDEWALL APPLICATIONS
Fig. 14