*Removable lid size is 18" x 18" and is made from strong 24 gauge 100% copper
*Outside base size is ACTUALLY 14" X 14" and is made with 16 guage copper
*Set screws are 2" long and adjust to fit the different variations in flue sizes
*Fits any outside tile dimensions between 11" x 11" to 14" x 14"
*Screen is 8" high and has a 3/4" mesh screen
*Made by Whitecaps in the USA and carries a lifetime warranty