Assessments - 4, GPA: 4.3
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Drop a plumb line from the inside of the roof to the locating hole in the ceiling. Mark the center point where the vent will penetrate the roof. Drill a small locating hole at this point. Roof Flashing 45° Elbow Wall Strap Ceiling Firestop Figure 19 - Offset with Wall Strap and 45°Elbows Flat Ceiling Installation 1. Cut a 10 3/4" square hole in the ceiling using the locating hole as a center point. The opening should be framed to 10 3/4"x10 3/4" (273 mm x 273 mm) inside dimensions, as shown in Figure 9 on page 8 using framing lumber the same size as the ceiling joists. If the area above the ceiling is an insulated ceiling or a room, nail firestop from the top side. This prevents loose insulation from falling into the required clearance space. Otherwise, install firestop below the framed hole. The firestop should be installed with no less than three nails per side (see Figure 20). 2. Assemble the desired lengths of pipe and elbows necessary to reach from the fireplace flue up through the firestop. Be sure all pipe and elbow connections are fully twist-locked (see Figure 8, page 8). 3. Cut a hole in the roof using the locating hole as a center point. (Cover any exposed open vent pipes before cutting hole in roof.) The 10 3/4"x10 3/4" hole must be measured on the horizontal; actual length may be larger depending on the pitch of the roof. There must be a 1" clearance from the vent pipe to combustible materials. Frame the opening as shown in Figure 9, page 8. 4. Connect a section of pipe and extend up through the hole. Note:If an offset is needed to avoid obstructions, you must support the vent pipe every 3 feet. Use wall straps for this purpose (see Figure 19). Whenever possible, use 45° elbows instead of 90° elbows. The 45° elbow offers less restriction to the flow of the flue gases and intake air. 5. Place the flashing over the pipe section(s) extending through the roof. Secure the base of the flashing to the roof and framing with roofing nails. Be sure roofing material overlaps the top edge of the flashing as shown in Figure 19. There must be a 1" clearance from the vent pipe to combustible materials. 6. Continue to add pipe sections until the height of the vent cap meets the minimum building code requirements described in Figure 7 on page 6. Note: You must increase vent height for steep roof pitches. Nearby trees, adjoining rooflines, steep pitched roofs, and other similar factors may cause poor draft or down-drafting in high winds. Increasing the vent height may solve this problem. 7. Twist-lock the vent cap onto the last section of vent pipe. Note:If the vent pipe passes through any occupied areas above the first floor, including storage spaces and closets, you must enclose pipe. You may frame and sheetrock the enclosure with standard construction material. Make sure and meet the minimum allowable clearances to combustibles. Do not fill any of the required air spaces with insulation. If area above is a room, install If area above is not a room, install firestop above framed hole. firestop below framed hole. Figure 20 - Installing Firestop For more information, visit more information, visit 108862-01D 14 14 VENTING INSTALLATION INSTRUCTIONS Installation for Vertical Termination (Cont.) VENTING INSTALLATION INSTRUCTIONS Continued Vertical Termination Configurations Figures 21 through 24 show four different configurations for vertical termination. V enting with T w o 90 ° Elbo w s Vertical (V) Horizontal (H1) + Horizontal (H2) 5' min. 2' max. 6' min. 4' max. 7' min. 6' max. 8' min. 8' max. 20' max. 8' max. Figure 21 - Vertical Venting Configuration Using Two 90°Elbows with Two Horizontal Runs (Vertical Round High Wind Termination Shown) Note:Install restrictor into inner collar of fireplace as shown.45° Elbow Venting with One 90 ° Elbow Vertical (V) 5' min. 6' min. 7' min. 8' min. 20' max. 45° Elbow Horizontal (H) 2' max. 4' max. 6' max. 8' max. 8' max. Note:Install restrictor into inner collar of fireplace as shown. Figure 22 - Vertical Venting Configuration Using One 90°Elbow (Vertical Round High Wind Termination Shown) V enting with T w o 9 0 ° E lbo ws Vertical (V5' min. 6' min. 7' min. 8' min. Note:Vertical (V145° Elbow 1) Horizontal (H) 6' max. 12' max. 18' max. 20' max. Note:Install restrictor into inner collar of fireplace as shown. ) + Vertical (V2) = 40' max. Figure 23 - Vertical Venting Configuration Using Two 90°Elbows (Vertical Round High Wind Termination Shown) For more information, visit more information, visit 108862-01D VENTING INSTALLATION INSTRUCTIONS Installation for Vertical Termination (Cont.) High Altitude Installation 15 VENTING INSTALLATION INSTRUCTIONS Continued V e r tical V enting V = 40' max. Note:Install restrictor into inner collar of fireplace as shown. 45° Elbow HIGH ALTITUDE INSTALLATION Your DESA International direct-vent fireplace has been CSA tested and approved for elevations from 0-2000 feet (USA)...
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