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14
51D0528
LX Series Direct Vent 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 minimum 1/4" rise
for every 12" of run towards the termination.
You may use up to three 90° elbows in this vent conguration. Refer to Horizontal (Through the
Wall) Termination Congurations on Page 18.
Measure the distance from the replace oor to the ceiling. Add the ceiling thickness, the vertical
rise in an attic or second story, and allow for sufcient 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 combina-
tion of 90° and 45° elbows up to a maximum of 270°.
For two-story applications, restops are required at each oor 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 balance between the combustion air intake and
the ue gas exhaust. Certain limitations apply to vent congurations and must be strictly followed.
A chase is a vertical boxlike structure built to enclose venting that runs along the outside of a build-
ing. A chase is required for such venting.
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