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Hersteller: Lennox Hearth Dateigröße: 1.41 mb Dateiname: Unterrichtssprache:

Refer to Figure 23 for minimum dimensions and mounting detail. NOTE: Hearth Extension must not cover the air inlet opening of a fireplace. The hearth extension described in Figure 23 must be a durable noncombustible material with a minimum (total) Rt value of 1.09; refer to Figure 24 for examples. The overall height (above a combustible floor), depth and width must be as indicated, with the extension centered to the fireplace opening. The top of insulation must be covered with a noncombustible decorative covering or a piece of .018” minimum sheet metal, to protect hearth extension material. (Fig. 23) Secure the hearth extension to the floor to prevent shifting, using trim molding or other similar means at three (3) outer edges. Seal crack between the fireplace hearth and hearth extension with a noncombustible material. (Figs. 23 and 25) Minimum Wall Clearances WITH Noncombustible Surround Facing WITHOUT Noncombustible Surround Facing Minimum Hearth Extension Dimensions (for On-Site Construction) GHGJSeal cracks between the fireplace and hearth extension with noncombustible material Safety strips must overlap 1/2" minimum May install noncombustible decorative covering OR .018" min. sheet metal FIREPLACE HEARTH COMBUSTIBLE FLOOR MINIMUM INSULATION VALUE "R" 4" MIN. FIREBOX OPENING A - Min. clearance to combustible perpendicular wall B - Min. clearance to combustible perpendicular wall when using noncombustible wall shield* SIDE WALL SIDE WALL F** C** EED4" BRICK (Example material) Combustible material permitted within shaded area. * Noncombustible wall shield requires 1" MHSC EH2416 insulation (minimum R Value = 1.85) between decorative noncombustible rigid covering and combustible wall. Minimum height and width is 40" x 40". ** Dimension/degree of angle will vary depending on thickness of noncombustible surround facing. 4" Shaded area starts 1/2" away from edge of unit. FP594 A B C D E F G H J SR/SC36A 16" 12" 48° 41° 18" 14" 7..." 16" 48" 406 mm 305 mm 457 mm 356 mm 197 mm 406 mm 1219 mm SR/SC42A 20" 12" 42° 35° 18" 14" 11..." 20" 61..." 508 mm 305 mm 457 mm 356 mm 292 mm 508 mm 1562 mm Fig. 23 Combustible side wall protection and hearth extension dimensions. 16 7412948 SR/SC Series "A" Woodburning Fireplace COMMON MATERIALS AND FACTORS MATERIAL K* R MINIMUM THICKNESS EH2416 (MHSC) 0.458 1.09 0.50 in.** Common Brick 5.0 0.10 5.46 in.** R Value is for 1/2 inch. * Units of K = BTU/SQ FT/HR/.F/IN ** Thickness of Listed Material FP533ADD Fig. 24 Hearth extension material factors. WARNING: HEARTH EXTENSION MUST BE INSTALLED IN ACCORDANCE WITH FIGURE 23 AND MUST NOT COVER THE BOTTOM FRONT OPENING OF THE CIRCULATING MODEL. Alternate noncombustible materials may be used providing the (total) thermal resistance (Rt value) of the alternate material employed is greater than or equal to R = 1.09. Thermal resistance (R) or thermal conductivity (K), may be obtained from manufacturer of the material. Factors are related by the formula K = 1/R. T = given thickness R = thermal resistance for a given thickness (T) K = thermal conductivity Noncombustible material with a lower R value may be used, provided thickness of material is sufficiently greater to maintain an equivalent (total) thermal resistance (Rt). Example of Determining Hearth Extension Equivalents To determine the thickness required for any new mate rial: NEW K of new material (per inch) thickness required = X of listed thickness K of listed material (per inch) material Example for Common Brick T (new) = 5.0/0.458 x 0.50 in. = 5.46 in. (new required thickness). FP550 Fig. 25 Sealing gaps. Wall Covering Noncombus- tible Decorative Facing 2 x 4 Header (Do not notch at standoffs) Seal all cracks between fireplace surround and wall materials with noncom- bustible material Noncombustible Decorative Cover- ing Hearth Extension Insulation Safety Strips Must be overlapped 1/2" minimum Seal crack between fireplace and hearth extension with noncom- bustible material Side View 7412948 17 SR/SC Series "A" Woodburning Fireplace Installing Line for Gas Logs MHSC fireplaces are designed to accept a 1/2" (13 mm) gas line for installation of an approved gas appliance. (MHSC manufactures a wide variety of gas logs for use in MHSC fireplaces.) Be sure to have the appliance installed in accordance with building codes. Gas connection may enter from either left or right side of the fireplace. Locate appropriate gas line in the outer casing of fireplace and remove insulation from gas line tube. (Fig. 26) From inside the fireplace, locate the knockout on the firebrick -- be sure you are on the appropriate or "gas line" side of the fireplace. Using a flat bladed screwdriver or small chisel and hammer, carefully tap around the knockout until it loosens and falls out. Install 1/2" (13 mm) certified gas pipe through opening. After gas pipe installation is complete, use insulation that was removed from gas line tube to repack space around the pipe. Material should be inserted from outside of ...

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