Desa WCM-36J, WCM-42J Firestop Spacers FS-10, 1100EFS-10DM for 36 Models, Penetrating the roof

Venting Installation

Continued

		Return	Return
		Elbow	Elbow
Offset		Offset	Return
Elbow			Elbow
		Elbow
	6' Max.		6' Max. Ceiling
Return			Support Pipe
		Return	12S-12DM	6' Max.
Elbow
		Elbow

6' Max.	Offset
Offset
Elbow	6' Max. Elbow	6' Max.
Offset
Elbow
A	B	C

Figure 12 - Typical Offset Terminations

Firestop Spacers (FS-10, 1100EFS-10DM for 36" Models)

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 13.

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 14.

Existing

Ceiling

Frame

Firestop Spacer

Screws or Staples (Min. of 8)

Figure 13 - Firestop Spacer with Living

Space Above Ceiling

Screws or Staples

Firestop(Min. of 8) Spacer

Existing

Ceiling

Frame

Figure 14 - Firestop Spacer with Attic

Space Above Ceiling

Penetrating the roof

To maintain a 1" (36" Models) or 2" (42/50" Models) clearance to the pipe on a roof with a pitch, a rectangular opening must be cut.

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

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

3.Use roof opening chart (Figure 15, page

11)to determine correct opening length and flashing required.

4.Remove shingles around opening mea- sured. Cut out this section.

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