Installation Planning; Horizontal And Vertical Termination - Vermont Castings 500DVMNSCSB Installation And Operating Instructions Manual

DVM Series Direct Vent Gas Fireplace

INSTALLATION PLANNING

There are two basic types of direct-vent installation:
•
Horizontal Termination
•
Vertical Termination
It is important to select the proper length of vent pipe for
the type of termination you choose. It is also important to
note the wall thickness.
FOR HORIZONTAL TERMINATION
Select the amount of vertical rise desired. All horizontal run
of venting must have 1/4" rise for every 12" of run towards
the termination below 7
1
or more vertical rise off top of fireplace, the horizontal run
may be level. NEVER run vent piping down.
Horizontal venting which incorporates the twist lock pipe must
be installed on a level plane without an inclining or declining
slope.
You may use up to three 90° elbows in this vent configura-
tion. See Horizontal Termination Configurations on Pages
15 and 16.
FOR VERTICAL TERMINATION
Measure the distance from the fireplace floor to the ceil-
ing. Add the ceiling thickness, the vertical rise in an attic
or second story, and allow for sufficient vent height above
the roof line.
NOTE: You may use two 45° elbows in place of a 90°
elbow. You must follow rise to run ratios when using
45° elbows. The appliance is approved for use with
three 90° elbows maximum or a combination of 90°
and 45° elbows up to a maximum of 270°.
When installing in a chase, you should insulate
the chase as you would the outside walls of
your home. This is especially important in cold
climates. Insulation should be considered a
combustible material. Maintain proper clearances
to all combustible materials.
Treatment of firestops and construction of the chase
may vary from building type to building type. These
instructions are not substitutes for the requirements
of local building codes. You must follow all local
building codes.
14
⁄ feet of vertical rise. With 7
2
Always maintain minimum clearances around vent
systems. The minimum clearance to combustibles for
horizontal vent pipe are 3" at the top and 1" at the sides
and bottom of the vent system until the pipe penetrates
the nearest vertical wall (1" required). A 1" minimum
clearance all around the pipe must be maintained at
outside wall and on vertical runs. Do not pack the open
air spaces with insulation or other materials. This could
cause high temperatures and may present a fire hazard.
*Unless the vertical run is 71/2 feet or higher (top vent
⁄ feet
1
2
units only), the clearances for the horizontal run is 1" at
the top.
Never run the vent pipe down. This may cause excessive
temperatures which could cause a fire.
For two-story applications, firestops are required at each
floor level. If an offset is needed in the attic, additional pipe
and elbows will be required.
You may use a chase with a vent termination with exposed
pipe on the exterior of the house. See Installing Vent
System in a Chase below. If pipe is enclosed in chase, it
is not exposed.
It is very important that the venting system maintain its bal-
ance between the combustion air intake and the flue gas
exhaust. Certain limitations apply to vent configurations
and must be strictly followed.
INSTALLING A VENT SYSTEM IN AN
OUTSIDE CHASE
A chase is a vertical boxlike structure built to enclose
venting that runs along the outside of a building. A chase
is required for such venting.
VENTING INSTALLATION
WARNING
WARNING
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