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11
WDV Series Gas Fireplace
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.
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 7Z\x feet of vertical rise. With 7Z\x feet or more vertical
rise off top of fireplace, the horizontal run may run level. NEVER run vent piping down.
You may use up to three 90° elbows in this vent configuration. Refer to Vertical/Horizontal Ter-
mination Configurations on Page 14.
Measure the distance from the fireplace floor to the ceiling. Add the ceiling thickness, the vertical
rise in an attic or second story, and allow for sufficient vent height above the roof line.
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°.
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.
Refer to Installing A Vent System in an Outside Chase below. If pipe is enclosed in chase, it is
not exposed.
It is very important that the venting system maintain its balance between the combustion air
intake and the flue gas exhaust. Certain limitations apply to vent configurations and must be
strictly followed.
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.