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Instructions for Installing CMU Blocks for Mason-Lite® Fireplaces NOTE: This installation is intended for fireplaces built in non-seismic areas. No rebar is required. WARNING: IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE CAN CAUSE INJURY, PROPERTY DAMAGE OR LOSS OF LIFE. REFER TO THIS AND YOUR FIREPLACE MANUAL.
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6 inch CMU required 8 inch CMU required Preparing your fireplace for CMU barrier on Combustible Flooring After determining the location of your fireplace, lay out your CMU blocks per the diagram above corresponding to your model fireplace. Note that for models MFP63 and MFP43ST, 8 inch high CMU blocks are required.
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