Assessments - 3, GPA: 3.3
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Cut and/or frame an opening, 10-1/2" x 12-1/8" (267 mm x 308mm) inside dimensions, about this center. C. Frame ceiling opening -If the vertical route is to penetrate a ceiling, use plumb line to locate the center above the appliance. Cut and/orframe an opening, 10-1/2" x 10-1/2" (267 mm x 267 mm) inside dimensions, about this center (refer to Figure 21 on page 15 ). G. Support the vertical run sections - On the vertical run, support the venting sys- tem every 8 feet (2.4m) above the fireplace vent outlet with field provided support straps (Plumber's tape). Attach the straps to the vent pipe and secure to the framing members with nails or screws. See Figure 24 on page 15. H. Change vent direction -At transition from or to a horizontal/inclined run, installthe 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 25 on page 16. I. Continue installation of horizontal/inclined sections -Continue with the installation of the straight vent sections in horizontal/inclined run as described in Step E. Install support straps every 5 ft. (1.52 m) along horizontal/inclined vent runs using conventional plumber’s tape. See Figure 35, 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. E. Attachventcomponentstoeachother-Other vent sections may be added to the previously installed section in accordance with the require- ments of the vent tables. To add another vent component to a length of vent run, align the dimpled end of the component over the inclined channel end of the previously installed section, adjusting theradialalignment until thefour lock- ing dimples are aligned with the inlets of the four incline channels of the previous section. Push theventcomponentagainsttheprevioussection until it fully engages, then twist the component clockwise running the dimples down and along the incline channels until they seat at the end of the channels.This seating position is indicated by the alignment of the arrow and dimple as shown in Figure 23 on page 15. d. Attach vent components to appliance -To attach a vent component to the appliance collar, alignthedimpledendoverthecollar,adjustingthe radialalignmentuntilthefourlockingdimplesare aligned with the inlets of the four incline channels on the collar (refer to Figure 22 on page 15). Both of these horizontal vent systems terminate through an outside wall. Building Codes limit or prohibit terminating in specific areas. Refer to Figure 8 on page 7 for location guidelines. Figures 35, and Figures 39 to 44 on pages 21 to 23 and their associated Horizontal Vent Table illustrate the various horizontal venting configurations that are possible for use with these appliances. Secure Vent pipe applications are shown in these figures; Secure Flex pipe may also be used. A Horizontal Vent Table sum- marizes each system’s minimum and maximum vertical and horizontal length values that can be used to design and install the vent components in a variety of applications. Push the vent component against the collar until it fully engages, then twist the component clockwise, running the dimples down and along the incline channels until they seat at the end of the channels. 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. Vertical Rise SV4.5E90 Elbow Horizontal / Inclined Run SV4.5HT-2 Termination Firestop/Spacer SV4.5L6/12/24/36/48 Vent Sections Support bracket spacing every 5 ft (1.52 m) See Figure 24 on page 15 for vertical vent section support. SV4.5HT-2 Termination Support BracketsBuilding Support Framing Ceiling Fireplace Exterior Wall Exterior Wall TYPICAL HORIZONTAL VENT INSTALLATION 20 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE. LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS IMPORTANT: The vent termination is hot while in operation and for a period of time following the use of the fireplace. To prevent contact with hot surfaces, we recommend the use of a Termination Guard. See Page 36. This can be purchased at your local dealer. Figure 36 Figure 37 Installing the Square Horizontal Termination (SV4.5HT-2) M. Insta...
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