Chimney Damper Repair & Top-Sealing Damper Installation — Nassau County

DME Maintenance installs top-sealing dampers starting at $999 in Nassau County. Throat damper repair is quoted on-site after inspection — call 516-690-7471. Top-sealing dampers are almost always the better long-term value: they seal tighter, last longer, and solve the summer odor and winter draft problem simultaneously.

A throat damper is the traditional cast-iron plate inside your firebox, just above the fire. A top-sealing damper installs at the very top of the flue and uses a rubber gasket to seal the chimney from above. Top-sealing dampers provide a far tighter seal, prevent animal entry, and eliminate summer odors — something a throat damper cannot do.

A throat damper that appears closed rarely seals fully — the cast iron warps from years of heat exposure and leaves gaps. Cold air falls through these gaps continuously. A top-sealing damper eliminates this entirely by sealing the flue at the top with a rubber gasket rated for tight closure.

Usually yes. In summer, air-conditioned homes create negative pressure that draws air down the flue — pulling creosote and moisture odors with it. A failed or partially open throat damper has no defense against this. A top-sealing damper stops it completely, and an annual chimney cleaning removes the creosote that causes the odor.

Throat damper replacement requires working inside a firebox and fitting a specific throat size — mistakes create a permanent draft problem. Top-sealing damper installation requires roof access and proper fit to your flue tile. DME Maintenance installs both types in Nassau County — most jobs completed in under two hours. Call 516-690-7471.