Monessen Hearth DIRECT VENT GAS FIREPLACE KHLDV400 - Manual (Page 12)

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KHLDV Series Gas Fireplace VentInG 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 below 7Z\x" of vertical rise from floor of fireplace. With 7Z\x feet or more of vertical rise
from the floor of the fireplace, the horizontal run may be level. NEVER run vent piping down.
You may use up to three 90° elbows in this vent configuration. Refer to Vertical/Horizontal Termination Con-
figurations on Page 16.
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 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.
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.
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arn
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never run the vent pipe down. this may cause
excessive temperatures which could cause
a fire.
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Ice
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.
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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.
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always maintain minimum clearances around vent systems. the minimum clearances 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 7
Z\x feet or higher from floor of fireplace, the clearance for the horizontal
run is 1" on all sides.