Chimney caps are essential for any ventilated fireplace system for several reasons.
First, chimney caps keep water and moisture out of your fireplace. When rain falls or even when humidity is high, chimneys can accumulate water that can run into your home. It can cause problems with mold and erosion inside your chimney. It can reduce the efficiency of your fireplace.
Secondly, chimney caps with mesh netting prevent small animals from entering your home through the chimney. This will not only save you from the hassle of having to chase down a bird or squirrel in your house. It also will save you and your family the discomfort of smelling deceased animals that have gotten stuck in your chimney.
Lastly, chimney caps keep debris from flying into your chimney and will save you the cost of paying to have it cleaned more often than necessary.