Vestal Outside Air Kit For Mason fireplaces. Pipe is 15" long with a 3 1/4" diameter. Vent is 6" long by 6" wide. Includes hardware and instructions. Made of steel. Draws air from outside house for combustion. Helps eliminate odors and smoking fireplaces. When used with a glass enclosure, helps eliminate heat and air conditioning loss. Item # MOKR This product ships in approximately 3 days