HYCC1018FeaturesMade from maintenance free non-corrosive aluminumHood is made from 18 gauge diamond embossed aluminumMesh is 16 gauge aluminum expanded metalNuts and bolts are stainless steelMade in the USAFinish: AluminumProduct Type: Fire back DimensionsFits round and square flues with outside tile dimentions ranging from 13" round to 18.25" x 18.25"Fits round and square flues with outside tile dimensions ranging from 7 x 7" to 13.5" x 13.5"Fits oval and rectangular flues with outside tile dimentions ranging from 7" x 11.5" to 13.5" x 18.25"Size 6" H x 23.5" W x 23.5" DOverall Height - Top to Bottom: 6"Overall Width - Side to Side: 23.5"Overall Depth - Front to Back: 23.5"Overall Product Weight: 5 lbsSize 6" H x 18.5" W x 18.5" DOverall Height - Top to Bottom: 6"Overall Width - Side to Side: 18.5"Overall Depth - Front to Back: 18.5"Overall Product Weight: 4 lbsSize 6" H x 22.5" W x 18.5" DOverall Height - Top to Bottom: 6"Overall Width - Side to Side: 22.5"Overall Depth - Front to Back: 18.5"Overall Produc