42"x42" Extra extra Large Antique Cast Iron Heat Grate Vent Floor Register VGC UpicUp. There are no chips or cracks or breaks in this grate.. The inner circle disc is 30 in diameter.. The circle can be bolted to the outside section there is a 7/8 of an inch setback all around underneath. The item "42x42 Extra Large Antique Cast Iron Heat Grate Vent Floor Register VGC UpicUp" is in sale since Thursday, May 23, 2019.This item is in the category "Antiques\Architectural & Garden\Hardware\Heating Grates & Vents". The seller is "bobwes80-6" and is located in Cobleskill, New York. This item can't be shipped, the buyer must pick up the item.