Installation
900079-00, 02/2014
Innovative Hearth Products
Astria™ Sirius Linear Direct-Vent Gas Fireplaces
25
8. Continue installation of horizontal/inclined sections
—Continue with the installation of the straight vent
sections in horizontal/inclined run. Install support straps every 5 ft (1.52 m) along horizontal/inclined vent runs
using conventional plumber’s tape.
Rise per foot run ratios are acceptable all the way to level. For best results, maintain the horizontal/inclined run in
a straight (no dips), slightly elevated plane of approximately 1/4” per 1 ft (20 mm per 1 m).
Maintain the required clearances to combustibles (
Page 23
).
9. Frame the roof opening
—Identify the location for the vent at the roof. Cut and/or frame opening (
Table 18
).
Table 18: Roof Framing Dimensions
C
D
Pitch
C
D
0/12
10 1/2” (267 mm)
10 1/2” (267 mm)
6/12
10 1/2” (267 mm)
12” (305 mm)
12/12
10 1/2” (267 mm)
17 3/4” (451 mm)
10. Install the roof flashing
—Extend the vent sections through the roof structure. Install the roof flashing over the
vent section and position such that the vent column rises vertically (use carpenters level). 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.
11. Install the storm collar
—Install the storm collar, supplied with the flashing, over the vent/flashing joint
(
Figure 23
). Loosen the storm collar screw. Slide collar down until it meets the top of the flashing. Tighten the
adjusting screw. Apply non-combustible caulking or mastic around the circumference of the joint to provide a
water tight seal.
Figure 23: Installing the Storm Collar
Figure 24: Installing the Vertical Termination
Storm
Collar
12. Install the vertical termination
—Extend the vent sections to the correct height (
Figure 4
). The SV4.5CGV-1
Vertical Termination (
Figure 24
) installs in the exact same fashion as any other Secure Vent
®
section.
If the vent system extends more than 5 ft (1.5 m) above the roof flashing, stabilizers are required. Additional
screws may be used at section joints for added stability. Guide wires or roof support assemblies may be attached
to the joint for additional support on multiple joint configurations.
