Fireplace throat dampers are used to regulate the flow of air from inside your home from moving up the chimney and being released outside. They are usually made of a cast iron plate that can be opened or closed with the help of a lever or handle. However, even the top-of-the-line plates do not hold a strong seal and you can lose valuable energy. Recent studies have shown brand new fireplace throat dampers can leak up to $200 worth of heating and cooling per year. Imagine what you may be losing with that old rusted throat damper that you have been meaning to replace. Do yourself a favor and start getting the most out of your home’s energy source - convert your fireplace from a throat damper to a top sealing chimney damper. Top sealing chimney dampers create a tight fit on the flue to ensure that your conditioned air cannot leak out through your chimney. They have been proven to be up to 90% more efficient than the traditional fireplace throat dampers. 
There are a few different models of chimney top dampers to choose from – the most popular being the Lock-Top and Lyemance brands. The Lock-Top chimney damper is constructed of a stainless steel lid that is attached to a cast aluminum frame by stainless steel springs. The Lock-Top chimney damper also features a safety device that will automatically lock the damper so it will stay open in the case of a chimney fire.
The Lock-Top II chimney damper is complete with an included chimney cap and your choice of a 3/4” or 5/8” mesh animal guard. 
The Lyemance energy-saving damper is made out of solid non-rusting aluminum and features a silicone rubber seal that creates a tight hold at the top of your flue. 
Opening and closing your top sealing chimney damper is a breeze with the long cables that are threaded down the flue and mount with the handle to the inside of your firebox. The Lyemance damper is also available for round flues. Whether you are heating or cooling your home, the top sealing chimney damper will act as a storm door to keep that expensive conditioned air inside your home where it belongs.Start saving your energy dollars - replace your fireplace throat damper with a top sealing chimney damper!
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