What is the difference between Lock-Top and Lyemance?

The main difference is in appearance. When the Lock-Top damper is closed, it’s not very visible because the lid is pulled down onto the base. It is more visible when opened, however, the lid provides some rain protection during use. Even though animals aren’t likely to try to enter the flue when it’s in use, we also offer a Lock-Top II damper, which includes a stainless steel chimney cap. This cap provides greater rain protection while also acting as a spark protection.

The Lyemance damper has a lower profile and is less visible from the ground. It has a power lever that, when activated, uses leverage to force the door open in situations where there might be frost or icing of the damper. When in use, this damper will allow moisture into the chimney. However, we have a chimney cap with screen combined with this damper to prevent this from occurring. This Lyemance OPC Damper With Cap will also prevent the entry of animals and birds while also acting as a spark arrestor.