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(102 mm) beyond the fireplace. • See Figure 7.1. Outer Shell of Fireplace Firebox Maintain air clearance to combustibles. Repack Insulation Knockout Gas Line Gas Line Refractory Seal with fireplace mortar or high temp noncombustible sealant 4 in. Combustible Materials 1-1/2 in. (38 mm) air space Combustible materials may be located at zero clearance to gas line beyond 4 in. (102 mm) from fireplace side. B. Junction Box Installation Your appliance is supplied with a Junction Box Kit. We recommend the junction box be installed and wired at this time to avoid reconstruction. • The Junction Box Kit is to be installed on the right side of the appliance; remove and discard the metal knockout. • Attach the junction box bracket to the junction box as shown in Figures 7.2 - 7.4. • Bring the electrical wires to the inside of the junction box and secure in place with the Romex connector. • Install the duplex receptacle in the junction box and attach the cover plate. • Prior to attaching the junction box to the appliance, the heat shield supplied with your appliance must be installed. Insert the top flange of the heat shield through the electrical knockout hole from the inside (Figure 7.5). • Attach the junction box bracket to the side of the appliance by slipping the bottom flange into the knockout hole. See Figure 7.5. Secure with the three screws provided in the fastener package. (102 mm) Figure 7.1 Gas Line Installation Heatilator • A36C & A42C • 28396 Rev Y • 10/06 Figure 7.5 Attach the Heat Shield Note: Do NOT wire 110 VAC to wall switch. Figure 7.6 Attach the Junction Box 1. Bend tab to open. Bottom Flange Figure 7.2 Prepare Junction Box Bracket 2. Slide the flange of the junction box through the slot in the bracket. Figure 7.3 Position Bracket on Junction Box This tab should be bent back under the flange to help secure the bracket to the junction box. Figure 7.5 Attach the Heat Shield Note: Do NOT wire 110 VAC to wall switch. Figure 7.6 Attach the Junction Box 1. Bend tab to open. Bottom Flange Figure 7.2 Prepare Junction Box Bracket 2. Slide the flange of the junction box through the slot in the bracket. Figure 7.3 Position Bracket on Junction Box This tab should be bent back under the flange to help secure the bracket to the junction box. Figure 7.4 Secure Bracket to Junction Box C. Installation of Fan Follow installation instructions supplied with fan kit. CAUTION Shock Risk • Do NOT remove grounding prong from plug. • Plug directly into properly grounded three- prong receptacle. • Route cord away from appliance. • Do NOT route cord under or in front of appliance. Heatilator • A36C & A42C • 28396 Rev Y • 10/06 26 Heatilator • A36C & A42C • 28396 Rev Y • 10/06 8 Finishing A. Hearth Extension A hearth extension must be installed with all fi replaces to protect the combustible fl oor in front of the fi replace from both radiant heat and sparks. See Figures 8.1 -8.3. 2 in. (51 mm) required High temperature (300°F min.) continuous, non-combustible sealant Tile, stone or other non-combustible material Floor constructed of wood or other combustible material HX3 or HX4 Hearth Ext or equivilent insulation (see Table below) Fireplace Protective Metal Hearth Strip Figure 8.1 Hearth Extension Construction 1 in. (25 mm) overlap Metal strips are placed 2 in. (51 mm) under the front of the fireplace and must extend beyond the front and sides of fireplace opening by 2 in. (51 mm). Figure 8.2 Positioning the Protective Metal Hearth Strips This fi replace has been tested and approved for use with a hearth extension insulated to a minimum R value of 1.16. To substitute materials for the factory-available hearth extensions, see Figure 8.3 and calculate insulation alternatives as per Table 8.1 and the following formulas: • Thermal conductivity per inch thickness = k • k = (BTU)(inch) / (foot2)(hour)(°F) • Required thickness = Rk • Thermal resistance per inch thickness = r • r = (foot2)(hour)(°F) / (BTU)(inch) • Required thickness = R / rB. A B C Figure 8.3 Hearth Extension Dimensions Fire Risk • Metal hearth strips MUST be installed. Sparks or embers may ignite fl ooring. WARNING Fire Risk • Hearth extensions must be installed exactly as specifi ed. High temperatures or hot embers may ignite concealed combustibles. WARNING Table 8.1 Hearth Extension Insulation Alternatives, R Value = 1.16 Material k per inch thick r per inch thick Minimum thickness required Hearth & Home HX3, HX4 0.43 2.33 1/2 in. USG Micore 300™ 0.46 2.18 1/2 in. USG Durock™ Cement Board 1.92 0.52 2-1/4 in. Cement Mortor 5.0 0.20 5-7/8 in. Common Brick 5.0 0.20 5-7/8 in. Ceramic Tile 12.50 0.08 14-5/8 in. Armstrong Privacy Plus Marble 14.3-20.0 0.07-0.05 16-5/8 in. - 23-3/8 in. Hearth Extension Dimensions Model # A B C A36 in. 52 16 8 mm 1321 406 203 A42 in. 66 20 8 mm 1676 508 203 B. Finishing Material • Combustible Material Material which is made of or surfaced with wood, compressed paper, plant fibers, plastics, or any material capable of igniting and burnin...

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