18
75D2523
MDV Series Direct Vent Gas Fireplace
VentIng InstallatIon
HOT
FP1955
horizontal vent cap
Figure 17 -
Install Horizontal Vent Cap
Vent Cap
Wood Screw
Apply Mastic to
All Sides
FP1955
w
arn
Ing
do not recess vent termination into any
wall. this will cause a fire hazard.
HOT
FP1956
vinyl siding standoff
Figure 18 -
Installing Vinyl Siding Standoff and Termination
Apply Mastic to All Sides
Cut Vinyl Siding Away to Fit Standoff
or Termination
Wood Screw
Termination
Bolt
Nut
Standoff #1250 or 5DT-VS
(Not Required for MHSC
Termination)
FP1956
not
Ice
for more information, refer to the instructions
supplied with the termination.
Figure 19 -
Connect Vent Cap with Horizontal Vent Pipe
Interior Wall
Surface
Fire Stop
Assembly
Horizontal
Vent Pipe
Screw
Vent Cap
(Horizontal
Termination)
FP1957
install firestop
FP1957
horIZontal wIth VertIcal rIse
(through-the-wall) termInatIon
confIguratIons
since it is very important for the venting system to
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 Vent Graph, showing the relationship between vertical
and horizontal side wall venting, will help to determine the
various dimensions allowable.
Refer to Page 15.
minimum clearance between vent pipes and combusti-
ble materials is 3" on top and 1" from bottom and sides
unless otherwise noted
(Exception: Outside wall with
firestop: 1" all around pipes are allowed)
. If the vertical
run is 7
Z\x
feet or more, off the top of the fireplace, the
clearance is 1" on all sides of the horizontal run.
When vent termination exits through foundations less than
20" below siding outcrop, the vent pipe must flush up with
the siding.
It is 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 (or the top of the
transition elbow) to the face of the finished outside wall or
the mounting flange of the termination.
all rear vent through-the-wall applications
must use mhsc-designed 5 x 8 square ter-
mination.
No other manufacturer's termina-
tion is pemitted in this application.
not
Ice
6. Slide the wall thimble over the vent pipe before con-
necting the horizontal run to the vent cap.
Figure 19
7. Carefully move the fireplace with vent assembly
attached toward the wall and insert the vent pipe into
the horizontal termination. The pipe overlap should
be a minimum of 1
Z\v
". Apply silicone to the outer pipe
connection. Fasten all vent connections with screws
provided.
8. Slide the wall thimble against the interior wall surface
and attach with screws.
Figure 19
