Installation Planning; Configuration; Combustible Materials - Majestic 400DVB Installation Instructions Manual

VeNt INstAllAtIoN

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.
You may use up to three 90° elbows in this vent configuration. Refer to Horizontal Termination
Configurations on Pages 20 and 21.
FoR VeRtIcAl teRMINAtIoN
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.
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°.
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 balance 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.
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.
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.

54D0701
DVB Series Direct Vent Gas Fireplace
Never run the vent pipe down. this may
cause excessive temperatures which could
cause a fire.
15