Monessen Hearth KHLDV500, KHLDV400 Termination Heights for Vents Above Flat or Sloped Roofs

KHLDV Series Gas Fireplace ventING installation

	1	/	2	"	10/
10					1	"
						2

FP1970

NailsFirestop

Figure 26 - If Area Above is Not a Room, Install Firestop above Framed Hole as Shown

2.Assemble the desired lengths of pipe and elbows nec- essary to reach from the burner system flue up through the firestop. Be sure pipe and elbow connections are fully twist-locked.

3.Cut a hole in the roof using the locating hole as a center point. (Cover any exposed open vent pipes before cutting hole in roof). The 101/2"x101/2" (267 x 267 mm) hole must be measured on the horizontal. Actual length may be larger depending on the pitch of the roof. There must be a 1" minimum clearance from the vent pipe to combustible materials. (Insulation should be considered a combustible material).

Horizontal Overhang

4.Connect a section of pipe and extend up through the hole.

NOTE: If an offset is needed to avoid obstructions, you must support the vent pipe every three (3) feet. Use wall straps for this purpose. Refer to Page 18, Figure 22. Whenever possible, use 45° elbows instead of 90° elbows. The 45° elbow offers less restriction to the flow of the flue gases and intake air.

5.Place the flashing over the pipe section(s) extending through the roof. Secure the base of the flashing to the roof and framing with roofing nails. Be sure roofing material overlaps the top edge of the flashing. There must be a 1" clearance from the vent pipe to combustible materials.

6.Continue to add pipe sections until the height of the vent cap meets the minimum building code requirements.

NOTE: You must increase vent height for steep roof pitches. Nearby trees, adjoining roof lines, steep pitched roofs, and other similar factors may cause poor draft or down-drafting in high winds. Increasing the vent height may solve this problem.

NOTE: If the vent pipe passes through any occupied areas above the first floor, including storage spaces and closets, you must enclose pipe. You may frame and sheetrock the enclosure with standard construction material. Make sure to meet the minimum allowable clearances to combustibles. Do not fill any of the required clearance spaces with

insulation.

TERMINATION HEIGHTS FOR VENTS ABOVE FLAT OR SLOPED ROOFS

		Vertical Wall
2 ft.	2 ft. Min.
Min.
	Lowest

Discharge

Opening

Termination Vent

12

H*X

Storm Collar

FP1971

Flashing

	1" Minimum
	Clearances to
Concentric	Combustibles
Vent Pipe

Roof Pitch	H (feet)
Flat to 6/12	1.0
Over 6/12 to 7/12	1.25
Over 7/12 to 8/12	1.5
Over 8/12 to 9/12	2.0
Over 9/12 to 10/12	2.5
Over 10/12 to 11/12	3.25
Over 11/12 to 12/12	4.0

*H - Minimum height from roof to lowest discharge opening of vent

Figure 27 -

Minimum Chimney Clearance

20 73D0024