Figure 42: Installation of Flashing & VerticalTermination.Figure 41: VerticalInstallation Using HighWind Cap.Ceiling FirestopNailsFigure 43: Installation ofCeiling Fire Stops.Step 5. Cut a hole in the roof centered on the small drill hole placedin the roof in Step 2. The hole should be of sufficient size tomeet the minimum requirements for clearance to combustibles,as specified earlier. Continue to assemble lengths of Pipe andElbows necessary to reach from the Ceiling Firestop up throughthe roof line.Notes:(1) If an offset is necessary in the attic to avoid obstructions, it is importantto support the vent pipe every 3 feet, to avoid excessive stress on theElbows, and possible separation. Wall Straps are available for thispurpose (see Figure 41).(2) Whenever possible, use 45° Elbows, instead of 90° Elbows. The 45°Elbow offers less restriction to the flow of flue gases and intake air.Step 6. Slip the flashing over the Pipe Section(s) protruding throughthe roof. Use a non-hardening sealant between the Flashingand the roof to prevent water leakage. Secure the base ofthe Flashing to the roof with roofing nails. Ensure the roofingmaterial overlaps the top edge of the Flashing as shown inFigure 42. Verify that you have at least the minimum clearanceto combustibles at the roofline.Step 7. Continue to add Pipe Sections until the height of the Vent Capmeets the minimum building code requirements describedby your local codes. In the absence of local codes, makesure the terminal is 2 feet (610mm) above anything within10 feet (3046mm) of the vent (refer to Figure 44 & Table 5for clearances for different pitches). Note that for steep roofpitches, the vent height must be increased. In high windconditions, nearby trees, adjoining rooflines, steep pitchedroofs, and other similar factors can result in poor draft, ordown-drafting. In these cases, increasing the vent height maysolve this problem.Step 8. Slip the Storm Collar over the Pipe, and push it down to the topof the Flashing, as shown in Figure 42. Use the non-hardeningsealant above and below the joint between the Storm Collarand the Pipe.Step 9. Twist lock the Vent Cap.Notes:(1) For multi-story vertical installations, a Ceiling Firestop is required atany subsequent floors (as shown in Figure 43). The opening shouldbe cut and framed in the same manner as the opening in Step 3 (seeFigure 40).(2) Any occupied areas above the first floor, including closets and storagespaces, which the vertical vent passes through, must be enclosed.The enclosure may be framed and sheet rocked with standardconstruction materials, however minimum allowable clearancesbetween the outside of the vent pipe must be maintained. Do not fillany of the required air spaces with insulation.24 | HZ965/L965 Gas Fireplace|24installation