The Lyemance top is a very popular design, with a silicon gasket for the tightest seal
, while the Lock Top is another popular damper that can fit almost any properly designed chimney cap or configuration. For round chimneys, such as the pipes coming from free standing wood burning fireplaces, a spider damper is need. It is a specially designed round damper plate that correctly seals round flues. By updated the damper in your fireplace, you can save money on your heating bills by using a damper with a silicon gasket, fully eliminating any heat loss through your chimney.