This unique combination features the best of both worlds. We have taken a lymance and incorporated it inside our premium cap. This combination is then easily bolted to the flue pipe just like our standard cap. Features For future cleanings the damper-cap combo is easily unbolted from the flue allowing the chimney to be cleaned properly with a full size chimney brush. No thick layers of silicone to cut through to remove the damper. When closed, the damper prevents heat air conditioning loss, down drafts and noise. When open, The Premium Cap protects against rain, snow, birds, animals and sparks. Specifications Overall Dimensions 13 L x 13 W . Note We do not accept buyer's remorse returns on these products. Please make sure it works for your needs before ordering. Stainless Steel Copper chimney caps have a Lifetime Warranty.