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This materials provides area for thermal expansion and motion of the damper during fireplace operation. The use of a lintel above the damper is extremely beneficial. his lintel is offered so that the masonry doesn’t bear instantly on the metallic damper which is subjected to extraordinarily high temperatures, and excessive magnitude thermal movements.

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All lintels used within the fire should bear on the brick masonry no less than four in. Firebrick could also be laid with any face exposed, however they are preferred as a stretcher course. However, if Grade SW brick are used, they should solely be laid as a stretcher course since they will not be as sturdy as the firebrick. The wall behind the firebrick on the rear of the firebox ought to be no less than 8 in. A larger thickness may be required to assist larger chimneys. The brickwork surrounding the combustion chamber could also be brought up, either concurrently the combustion chamber, or after it has been completed. In any case, there should be a full course of masonry surrounding the combustion chamber, to permit for solidly filling the void created and maintaining a minimum 1-in.

airspace between the firebrick and surrounding brickwork, see Fig. This airspace may be full of a compressible, noncombustible material, corresponding to a fibrous insulation. The purpose of this material is to keep the area clear of obstructions. Either the airspace or the compressible, noncombustible materials reduces the stress from thermal actions by isolating the combustion chamber.

These headers must be minimize to a size that gives total perimeter help of the flue liner, without obstructing the flue liner opening. The damper meeting ought to solely keep up a correspondence with masonry, on which it bears. To guarantee this, once the damper meeting is seated, it ought to be wrapped with a compressible, noncombustible materials, corresponding to fibrous insulation, see Fig.

fireplace remodel

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On line A-A, measuring from Point I one-half (half of) the fireplace opening dimension in each course, thereby defines points a and b. Connecting these 4 factors offers the define of the within face of the combustion chamber.

Combustion chamber layout is critical since the chamber must be contained within the firebox meeting yet isolated from it. Figure 2 exhibits one method of properly finding the combustion chamber. Once desired dimensions have been selected from Table 1, in Technical Notes 19 Revised, the front wall of the fireside is situated and line A-A struck at the inside face position. Point I corresponds to the centerline of the combustion chamber within the direction perpendicular to the prevailing line.

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The air passageway is mostly included into the base assembly. In many areas, the perimeter of the air passageway should be insulated, especially when the ductwork is adjoining to or passing via heated areas. Many air passageway areas have been used efficiently, often various from 6 to 60 sq in. Larger areas may current a potential problem by delivering air in extra of the combustion and draft requirements. The excess air, often below room temperature, could also be forced into the room containing the fireplace.