Installation, Rigid Vent Systems, Diagram, Feet

INSTALLATION

UNIT INSTALLATION

WITH VERTICAL

TERMINATION

(Rigid Vent Systems)

Note: A clearance of 2"(51mm) must be maintained; except when passing through a wall, ceiling, or at the termination where the use of a ﬁrestop or wall thimble reduces the required clearance to 1-1/2" (38mm). We recommend framing a 11"(279mm) x 11"(279mm) (inside dimensions) hole to give structural rigidity for mounting the termination.

1) Maintain the 2" (51mm) clearances (air spaces) to combustibles when passing through ceilings, walls, roofs, enclosures, attic rafter, or other nearby combustible surfaces. Do not pack air spaces with insulation. Check "Venting Arrangemnt - Vertical Termination" s e c t i o n f o r t h e maximum vertical rise of the venting system and the maximum horizontal offset limitations.

2) Set the gas appliance	Diagram 1
2) Set the gas appliance
in its desired location.
Drop a plumb bob

down from the ceiling
to the position of the
appliance ﬂue exit,
and mark the location
where the vent will
penetrate the ceiling.
Drill a small hole at
his point. Next, drop
a plumb bob from
the roof to the hole
previously drilled in
the ceiling, and mark
the spot where the	Diagram 2

vent will penetrate the roof. Determine if ceiling joists, roof rafters or other framing will obstruct the venting system. You may wish to relocate the appliance or to offset, as shown in Diagram 2 to avoid cutting load bearing members.

3)A Firestop spacer must be installed in the ﬂoor or ceiling of every level.

Diagram 3

4)Assemble the desired lengths of pipe and elbows. Ensure that all pipes and elbow connections are in the fully twist-locked position and sealed.

Note:

For best results and optimum performance with each approved venting system, it is highly recommended to apply “Mill-Pac” sealant (supplied) to every inner pipe connec- tion. Failure to do so may result in drafting or performance issues not covered under warranty. Silicone (red RTV) is optional.

5)Cut a hole in the roof centered on the small drilled hole placed in the roof in Step 2. The hole should be of sufﬁcient size to meet the minimum requirements for clearance to combustiblesof1-1/2"(38mm).Sliptheﬂashing under the shingles (shingles should overlap half the ﬂashing) as per Diagram 4.

Diagram 4: The upper half of the ﬂashing is installed under the rooﬁng material and not nailed down until the chimney is installed.

This allows for small adjustments.

6)Continue to assemble pipe lengths.

Note: If an offset is necessary in the attic to avoid obstructions, it is important to support the vent pipe every 3 feet (0.9 meter), to avoid excessive stress on the elbows, and possible separation. Wall straps are available for this purpose

(Diagram 2).

Galvanizedpipeisdesirableabovetherooﬂine duetoitshighercorrosionresistance.Continue to add pipe sections through the ﬂashing until the height of the vent cap meets the minimum height requirements speciﬁed in Diagram 5 or local codes. Note that for steep roof pitches, the vertical height must be increased.

Diagram 5

	Minimum Vent
Roof Pitch		Height
	Feet		Meters
ﬂat to 7/12	2		0.61
over 7/12 to 8/12	2		0.61
over 8/12 to 9/12	2		0.61
over 9/12 to 10/12	2.5		0.76
over 10/12 to 11/12	3.25		0.99
over 11/12 to 12/12	4		1.22
over 12/12 to 14/12	5		1.52
over 14/12 to 16/12	6		1.83
over 16/12 to 18/12	7		2.13
over 18/12 to 20/12	7.5		2.29

A poor draft, or down drafting can result from highwindconditionsnearbigtreesoradjoining roof lines, in these cases, increasing the vent height may solve the problem.

7)Ensure vent is vertical and secure the base of the ﬂashing to the roof with rooﬁng rails, slide storm collar over the pipe section and seal with a mastic.

8)Install the vertical termination cap by twist- locking it.

Note: Any closets or storage spaces, which the vent passes through must be enclosed.

Offset Chart

24	Regency® L676-1 Direct Vent Gas Fireplace