Venting Installation

Continued

Screws

B

A

Figure 9 - Elbow Offset

Firestop Spacers (FS-10)

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 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

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

Existing

Ceiling

Frame

Figure 11 - Firestop Spacer with Attic

Space Above Ceiling

Penetrating roof

To maintain a 1" clearance to pipe on a roof with a pitch, a rectangular opening must be cut.

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

4.Remove shingles around the opening measured. Cut out this section.

5.Add next sections of pipe until the end penetrates roof line. Check to see that the proper clearances are maintained. Extend chimney by adding sections of double wall pipe until pipe is minimum of 30" above the highest point of the roof cutout. Termination and chimney must extend a minimum of 36" above the highest point where it passes through the roof.

19.5" Min.

30" Min.

 

 

2" Min.

 

2" Min.

 

2" Min.

 

Opening "A"

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- 12/12

45.0°

27"

V12F-10DM

Figure 12 - Roof Opening Measurements

Flashing installation (v6f-10dm or v12f-10dm)

Determine flashing to be used with the roof opening chart. Slide flashing over pipe until base is flat against roof. Replace as many shingles as needed to cover exposed area and flashing base. Secure in position by nailing through shingles (see Figure 13, page 10). DO NOT NAIL THROUGH FLASHING CONE.

109493-01R

www.fmiproducts.com

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