A fireplace damper is a mechanism that seals your fireplace shut while it is not in use. It is generally found in the throat of a brick chimney directly above the firebox. This is required to ensure that hot air from your home does not escape up the chimney when the fireplace is turned off. The throat is that part of fire place that is a bit upside by the fire, it gets narrow in its width when it reaches to damper.

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CONSTRUCTION:

To begin the throat’s construction, four courses of brick are placed on top of the damper, allowing enough space for the damper door to open upward.

The side and front walls of the fifth course should be corbeled an inch, but the rear wall should remain straight. The throat (also known as the smoke chamber) was corbeled an inch every course until it reached the breadth of the square clay flue tiles that line the chimney—in this example, 1012 inches. Divide the horizontal distance to be corbeled by the number of courses to determine how much to corbel each unit. The National Fire Protection Association (NFPA) recommends that smoke chamber walls be no more than 45 degrees from vertical and no taller than the width of the fireplace entrance. The thickness of walls should be 8” with 6” if its lining is firebrick. They must also be at least 2 inches away from flammable materials including wall studs, external sheathing, and drywall. The final two courses before the flue liner should be installed as headers cut to a length that provides entire perimeter support for the flue liner without blocking the flue liner aperture, according to BIA. Set the first flue tile after mortaring the top of the throat. To seal it, the exterior of the neck was also parged with mortar.