When looking for materials to help keep the efficiency and esthetic presences of your woodstove, pellet stove, or gas stove top notch, it is important to make sure that you have the right materials. One material that is helpful to maintenance is your basic chimney cap. Chimney caps prevent excessive moisture from getting into your unit. It also keeps pesky critters from making a home during the burning off season. Chimney caps should be made entirely of stainless steel or copper to prevent rusting and staining on masonry chimneys. Additionally, if the gap between the chimney and the top of the cap is not great enough, a proper draft will not be created. This will not allow your unit to burn at its optimal temperature.