35Step 9. FinishingFigure 38 shows the minimum vertical and correspondingmaximum horizontal dimensions of fireplace mantels or othercombustible projections above the top front edge of thefireplace. See Figures 3 and 4 for other fireplace clearances.Only non-combustible materials may be used to cover theblack fireplace front.WARNING: WHEN FINISHING THE FIREPLACE,NEVER OBSTRUCT OR MODIFY THE AIR IN-LET/OUTLET GRILLES IN ANY MANNER.!Figure 38.Minimum Vertical and Maximum HorizontalDimensions of Combustibles above FireplaceCAUTION: IF JOINTS BETWEEN THE FINISHED WALLSAND THE FIREPLACE SURROUND (TOP AND SIDES)ARE SEALED, A 300° F. MINIMUM SEALANT MATE-RIAL MUST BE USED. THESE JOINTS ARE NOT RE-QUIRED TO BE SEALED. ONLY NON-COMBUSTIBLEMATERIAL (USING 300° F. MINIMUM ADHESIVE, IFNEEDED) CAN BE APPLIED AS FACING TO THE FIRE-PLACE SURROUND (SEE FIGURE 39).Hearth ExtensionsA hearth extension may be desirable for aesthetic reasons.However, ANSI or CAN/CGAtesting standards do not requirehearth extensions for gas fireplace appliances.Figure 39. Sealant Material2”4" 5” 6” 7” 8” 9”2"3"4"5"12"11"10"9"8"7"6"TOP FRONT EDGEOF FIREPLACE3”11”12”10”31”CEILING1”1”TOP SEALJOINTSIDE SEALJOINT0”1/4”FINISH MATERIALMAY BE COMBUSTIBLE- TOP AND SIDESOF UNITFigure 40Refractory Kit Placement (BRICK-291, BRICK-293)CAUTION: REFRACTORY IS FRAGILE! CAREFULLY RE-MOVE THE REFRACTORY FROM THE PACKAGING.Remove the logs from the fireplace. Place the back wallrefractory centered against the back of the fireplace on thegrate assembly (see Figure 40).When positioning the left wall use care in not knocking theback wall down. Position the left wall all the way back againstthe back wall. Using the retaining clip and screw included,secure the side wall refractory as shown (see Figures 41and 42).Figure 41Figure 42Position upper back refractory by placing on left wall thensliding in right wall (see Figure 43).