Desa (V)gM36 Venting Installation, Continued, Firestop Spacers FS-10, 1100EFS-10DMfor GM36

Venting Installation

Continued

Screws

B

A

Figure 9 - Elbow Offset

Firestop Spacers (FS-10, 1100EFS-10DM for GM36)

Firestop spacers are required at each point where the chimney penetrates a floor space. Their purpose is to establish and maintain the required clearance between the chimney and the combustible materials. When the pipe passes through a framed opening into a living space above, the firestop must be placed onto the ceiling from below as shown in Figure 10.

They also provide complete separation from one floor space to another or attic space as required by most codes. When the double wall pipe passes through a framed opening into an attic space, the firestop must be placed into an attic floor as shown in Figure 11.

Existing

Ceiling

Frame

Penetrating the roof

To maintain a 1" (GM36) or 2" (GM42/GM50) clearance to the pipe on a roof with a pitch, a rectangular opening must be cut.

1.Determine the center point through which the pipe will penetrate the roof.

2.Determine the center point of the roof. Pitch is the distance the roof drops over a given span, usually 12". A 6/12 pitch means that the roof drops 6" for each 12" one measure horizontally down from the roof rafters.

3.Use the roof opening chart (Figure 12) to determine the correct opening length and flashing required.

17" Min.	30" Min.
	1" Min.
	1" Min.
	1" Min.
	Opening "A"

Pitch	Slope	Opening	Used Flashing
		"A" Max.	Model No.
Flat	0°	17"	V6F-10DM
0-6/12	26.6°	19"	V6F-10DM
6/12-	45.0°	24"	V12F-10DM
12/12

Roof Opening GM36

Firestop Spacer

Screws or Staples (Min. of 8)

Figure 10 - Firestop Spacer with Living

Space Above Ceiling

Screws or Staples

Firestop(Min. of 8) Spacer

19.5" Min.

2" Min.

2" Min.

30" Min.

2" Min.

Opening "A"

Existing

Ceiling

Frame

Figure 11 - Firestop Spacer with Attic

Space Above Ceiling

Pitch	Slope	Opening	Used Flashing
		"A" Max.	Model No.
Flat	0°	19.5"	V6F-10DM
0-6/12	26.6°	22'	V6F-10DM
6/12-	45.0°	27"	V12F-10DM
12/12

Roof Opening GM42/50

Figure 12 - Roof Opening Measurements

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