Loop the tape around the vent, securing the ends of the tape to the framing. If desired, sheet metal screws #6 x ¹⁄₂" length may be used to secure the support straps to the vent pipe. Refer to Figure 17.
F. Change vent direction to horizontal/inclined run - At transition from or to a horizontal/ inclined run, install the SV4.5E45 and SV4.5E90 elbows in the same manner as the straight vent sections. The elbows feature a twist section to allow them to be routed about the center axis of their initial collar section to align with the re- quired direction of the next vent run element.
Twist elbow sections in a clockwise direction only so as to avoid the possibility of unlocking any of the previously connected vent sec- tions. See Figure 18.
4 ¹³⁄₁₆" | 8 ¹⁄₈" |
(206 mm) | |
(122 mm) |
|
Swivel Joint | Swivel Joint | |
(360° swivel) | ||
(360° swivel) | ||
SV4.5E45 | SV4.5E90 | |
(45° Elbow) | (90° Elbow) |
Figure 18
G. Continue installation of horizontal/inclined sections - Continue with the installation of the straight vent sections in horizontal/inclined run as described in Step C. Install support straps every 5' (1.52 m) along horizontal/inclined vent runs using conventional plumber’s tape. It is very important that the horizontal/inclined run be maintained in a straight (no dips) and recommended to be in a slightly elevated plane, in a direction away from the fireplace of ¹⁄₄" rise per foot (20 mm per meter) which is ideal, though rise per foot run ratios that are smaller are acceptable all the way down to at or near level. Use a carpenter’s level to measure from a constant surface and adjust the support straps as necessary.
It is important to maintain the required clear- ances to combustibles: 1" (25 mm) at all sides for all vertical runs; and 3" (76 mm) at the top, 1" (25 mm) at sides, and 1" (25 mm) at the bottom for all horizontal/inclined runs.
H. Frame roof opening - Identify location for vent at the roof. Cut and/or frame opening per Roof Framing Chart and Figure 19.
C
D
Framing Dimensions for Roof
Pitch | C | D |
|
|
|
0/12 | 10¹⁄₂ in. | 10¹⁄₂ in. |
| (267 mm) | (267 mm) |
|
|
|
6/12 | 10¹⁄₂ in. | 12 in. |
| (267 mm) | (305 mm) |
|
|
|
12/12 | 10¹⁄₂ in. | 17 ³⁄₄ in. |
| (267 mm) | (451 mm) |
|
|
|
Figure 19
I. Install the roof flashing - Extend the vent sections through the roof structure. Install the roof flashing over the vent section and posi- tion such that the vent column rises vertically (use carpenters level) (Figure 20 ). Nail along perimeter to secure flashing or adjust roofing to overlap the flashing edges at top and sides only and trim where necessary. Seal the top and both sides of the flashing with waterproof caulking.
Figure 20
J. Install the storm collar - Install the storm collar, supplied with the flashing, over the vent/ flashing joint. See Figure 21. Loosen the storm collar screw. Slide collar down until it meets the top of the flashing. Tighten the adjusting screw. Apply
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Storm
Collar
Figure 21
K. Install the vertical termination - The final step involves installation of the
Figure 22
If the vent system extends more than 5' (1.5 m) above the roof flashing, stabilizers may be necessary. Additional screws may be used at section joints for added stability. Guide wires may be attached to the joint for additional support on multiple joint configurations.
11