The Lock-Top top mount damper has a stainless steel lid attached to a cast-aluminum frame by an array of stainless spring wires. It comes with a 30' cable that is dropped down the chimney and is operated with a handle mounted in the firebox. It comes with a Chimney Fire Safety Device that locks the damper open in case of a chimney fire.
Fits Inside Flue Sizes 9" x 14" to 12 1/2" x 17 1/2" and has a Cross-Sectional Area of 150 sq. inches.
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