Monessen Hearth HDV500NV/PV - Manual (Page 18)

HDV Series Direct Vent Gas Fireplace
18 56D3048
VeNtING INStAllAtIoN
HOT
FP1955
horizontal vent cap
Figure 17 -
Install Horizontal Vent Cap
Vent Cap
Wood Screw
Apply Mastic to
All Sides
FP1955
W
ARNING
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 #150 or 5DT-VS
(Not Required for MHSC
Termination)
FP1956
N
ot
IC
e
For more information, refer to the instructions
supplied with the termination.
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 1Z\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
FP1957
install firestop
Figure 19 -
Connect Vent Cap with Horizontal Vent Pipe
Interior Wall
Surface
Fire Stop
Assembly
Horizontal
Vent Pipe
Screw
Vent Cap
(Horizontal
Termination)
FP1957
HoRIZoNtAl WItH VeRtICAl RISe
(tHRouGH-tHe-WAll) teRMINAtIoN
CoNFIGuRAtIoNS
Since it is very important that the venting system main-
tain its balance between the combustion air intake and
the flue gas exhaust, certain limitations as to vent con-
figurations 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. Page 16
Minimum clearance between vent pipes and combus-
tible 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).
When vent termination exits through foundations less than
0" 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 outer wall or the mount-
ing flange of the termination.