17103296INSTALLINGContinuedContinuedFigure 17 - Inserting Firebox Into Cabinet Mantel1. Frame in rough opening. Use dimensions shown in Figure 18 for the roughopening.35 1/2"17 3/4"33" (FB32C)34 1/4" (FB32NC)Figure 18 - Rough Opening for Installing in WallBUILT-IN FIREBOX INSTALLATIONBuilt-in installation of this firebox involves installing firebox into a framed-inenclosure. This makes the front of firebox flush with wall. If installing a mantel abovethe firebox, but you must follow the clearances shown in Figure 7, page 11. Followthe instructions below to install the firebox in this manner.Height Front Width DepthModel # Actual Framing Actual Framing Actual FramingFB32C 32 3/8 " 33" 34 5 /16 " 35 1/2 " 16 11 /16 " 17 3 /4 "FB32NC 33 11/16" 34 1/4" 34 5/16" 35 1/2" 16 11/16" 17 3/4"