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. . . 4" • Top spacer. . . . . . . . . . . . . . . . . . . . . . . . . . 0" See Figures 3 and 4. CAUTION: Do not block required air spaces with insulation or any other material. Do not obstruct effective opening of appliance with any type of facing material. Figure 4 - Clearances from Top View Mantel Clearances Woodwork, such as wood trims, mantels and other combustible materials, should not be placed within 7" of the opening of this appliance (see Figure 5). Combustible material above the fireplace projecting more than 1 1/2" from the appliance’s front face must not be less than 12" from the appliance opening (ref. NFPA Standard 211 Sec. 7-3.3.3). Note: Mantel clearances applyto both sides of the applliance. Header Drywall Fireplace Top 12 1/4" (Ref.) 6" (Ref.) 33° 12" Min. 7" Min. to EffectiveOpening3" Nom. 1 1/2" Max. CombustibleMaterials Figure 5 - Mantel Clearances framing Construct framing using dimensions shown if Figures 6, 7 and 8. (Use the figure applicable to your application.) Figure 6 shows the framing dimensions prior to having the appliance in place. If installing on a platform, platform must be solid, flat and fully supported (see Figure 7). Once the unit has been fitted, bring studs in against nailing flanges located on the side of the appliance making sure a 1" clearance is maintained as shown in Figure 8. If the fireplace is to be installed directly on carpeting, tile (other than ceramic) or any combustible material other than wood flooring the fireplace must be installed upon a metal or wood panel extending the full width and depth of the fireplace. vent pipe installation A 6" B-1 type gas vent pipe is a double wall, venting system (not supplied) which must be installed during rough framing of the appliance. Any B-1 type gas vent system may be used for proper venting as long as the vent system is installed per the vent manufacturer’s recommendations. DESA supplies this appliance with a tapered starter pipe for a snug fit. Slide B-1 type vent pipe over this starter pipe until vent pipe is fully seated. Secure this first section of B-vent pipe by strapping the connector around the vent pipe and then tightening the strap with any 1/8" nut and bolt (see Figure 9). Note: Visually inspect for proper vent connection by looking inside top of appliance. If connection does not appear to be correct, contact your local service technician. Fireplace Installation Continued Nailing Flange1" Min. to CombustiblesPreparedFramingNails or Screws Figure 8 - Securing Appliance with Nailing Flanges 52 3/4"Min.41" 25 5/8" Figure 6 - Framing Dimensions Prior to Placing Appliance B-1 Type Vent (Not Supplied) 52 3/4" Min. 24" * Strap (Fasten with 1/8" Screw or Bolt) *As required by design as long as ceiling clearance is maintained Figure 9 - Installing B-Vent Pipe Figure 7 - Framing Dimensions Prior to Placing Appliance Using a Platform Optional Outside air Kit (Model ak-4) The installation of an outside air kit should be completed during the rough framing of the fireplace due to the nature of it's location. Outside combustion air is accessed through a vented crawl space. CAUTION: Air inlet ducts must not be terminated in an attic space. Avoid installing outside air eyebrow in areas where inlet opening may be blocked by snow, bushes or other obstacles (see Figure 10). The maximum height for the air inlet termination cannot exceed 3 feet below the B-vent termination exhaust height. Fireplace Installation Continued Wall Switch (Supplied) To Thermopile OFPILOTONFTOIPL7TPTHTPTH Secure to Collars with Duct Tape or Screws Air Inlet Location Must Allow For Bushes or Snow Back View Route Millivolt Wires (Supplied) Through Electrical Conduit Bushing Figure 11 - Wall Switch Installation Air Inlet Eyebrow Vent Hood Required for Wall Installation Vented Crawl Space (Check Local Codes Before Installing in a Vented Crawl Space) Figure 10 - Outside Air Kit Wall Switch Installation The electronic version uses a 24 VAC current supplied from a transformer mounted on the ignition module and is prewired for easy connection to a wall switch. The millivolt version uses a self-generated millivolt current that allows you to activate the gas control valve directly without the use of normal household electricity. Both versions are supplied with a wall switch kit for ready connection and mounting. CAUTION: Do not connect the remote wall switch to a regular 120v power source! Gas valve will be damaged beyond repair. Connect 18 ga. wires from wall switch to gas control valve terminals marked TH and TPTH or to ignition module using pigtails and wire nut connectors supplied with appliance. Note: If any of the original supplied wire must be replaced, use type 18 AWG-105 C (25 ft. maximum length) or equivalent only. CAUTION: Due to high temperatures, make sure wires are not touching upper firebox. GAS SUPPLY TESTING Note: This section is intended as a guide for qualified technicians installing gas to this appliance. CAUTION: Do not connect applia...

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