Assessments - 4, GPA: 4.3
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Remember to maintain 1" (25 mm) clearance to combustibles, framing members, and attic or ceiling insulation when running vertical chimney sections. Attic insulation shield (96K94) may be used to obtain the required clearances indicated here. See installation accessories table on page 26. E. Support the vertical vent run sections Note -Proper venting support is very important. The weight of the vent must not be supported by the firplace in any degree. Support the vertical portion of the venting system every 8 feet (2.4m) above the fireplace vent outlet. One method of support is by utilizing field provided support straps (conventional plumber's tape). Secure the plumber's tape to the framing members with nails or screws. Loop the tape around the vent, securing the ends of the tape to the framing. If desired, sheet metal screws #6 x ..." length may be used to secure the support straps to the vent pipe. See Figure 25. Another method, where the vent is not adjacent to a wall, is illustrated inFigure 26. Here, support straps (96K93) and support plates (96K92) can be used to support the weight of the vent. 1 inch (25.4 mm) minimum clearance to combustibles 8 feet (2.4 m) Maximum Blocking SupportStraps (Plumber’s tape) Figure 25 8 feet (2.4 m) Maximum SV4.5CGV-1 Termination SV4.5FA OR SV4.5FB FlashingAND SV4.5SC STORM COLLAR **SV4.5VF Firestop/Spacer 1" (25.4 mm) Minimum Clearance to Combustibles *SV4.5SU Support Strap SV4.5SP *Support Plate CeilingFraming **When using Secure Flex, use Firestop/SpacerSF4.5VF 8 feet (2.4 m) Maximum SV4.5CGV-1 Termination SV4.5FA OR SV4.5FB FlashingAND SV4.5SC STORM COLLAR **SV4.5VF Firestop/Spacer 1" (25.4 mm) Minimum Clearance to Combustibles *SV4.5SU Support Strap SV4.5SP *Support Plate CeilingFraming **When using Secure Flex, use Firestop/SpacerSF4.5VF Figure 26 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 required direction of the next vent run element. Twist elbow sections in a clockwise direction only so as to avoid the possiblity of unlocking any of the previously connected vent sections. See Figure 27. 4 ....." (122 mm) Swivel Joint 7 ..." (194 mm) Swivel Joint (360° swivel) (360° swivel) SV4.5E45 SV4.5E90 (45° Elbow) (90° Elbow) Figure 27 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 ft. (1.52 m) along horizontal/inclined vent runs using conventional plumber’s tape. See page 16, Figure 37.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 ..." 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 clearances 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 28. C D Framing Dimensions for Roof Pitch C D 0/12 10... in. (267 mm) 10... in. (267 mm) 6/12 10... in. (267 mm) 12 in. (305 mm) 12/12 10... in. (267 mm) 17 ... in. (451 mm) Figure 28 I. 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) (Figure 29). 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 29 J. Install the storm collar -Install the storm collar, supplied with the flashing, over the vent/ flashing joint. See Figure 30.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. Storm Collar Figure 30 K. Install the vertical termination -The final step involves installation of the SV4.5CGV-1 Vertical Termination. Extend the vent sections to the height as shown in the "Vertical vent termination section" on page 4. The SV4.5CGV-1 Vertical Termination (Figure 31)can be installed in the exact same fashion as any other Secure Vent section. Align the termination over the end of the previously installe...
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