Madd Hatter Chimney Sweep installs a variety of Chimney Cap / Spark Arrestors. Just like homeowners, Chimney flues vary in size and shape. The Chimney Cap / Spark Arrestor provides many benefits. It acts as a Spark Arrestor to keep ignited embers contained to the Chimney Flue. This helps to prevent a Rooftop or Brush Fire on ones own property or a neighbors property. The roof of the cap acts similar to an umbrella. It keeps moisture from rain or snow melt out of the Chimney Flue System. This helps protect the system from Water Damage! In addition, Urban Wild Life is found throughout the entire Metro Area. The Chimney Cap / Spark Arrestor acts like an animal cage to keep animals out instead of in! This prevents Critter Intrusion of animals such as Birds, Squirrels and Raccoons! Some fireplace enthusiasts prefer to have a Cap / Damper Combo installed, that is a Chimney Cap / Spark Arrestor with a Damper built inside. This gives all the same benefits while allowing the system to be closed at the top of the chimney instead of the bottom of the chimney!