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- The firebox is the area that contains the fire; it is commonly constructed of either metal sheeting or firebrick. Since the heat of the fire keeps the firebox clean, very little upkeep is required.
- Gently scrub the walls of the firebox opening with a stiff-bristle brush (not a wire brush) only to the height of the lintel (the heavy steel brace that supports the masonry above the fireplace opening).
- Be gentle with firebrick because it crumbles easily. Be careful not to bend any edges on a metal firebox where it joins the flue. Bent edges leave openings to the wall stud or supports where fire could spread.
- If your fireplace does not have an ash pit or box, shovel the bulk of the ashes into a bag and vacuum the remaining lightweight ashes.