- 26 gauge galvanized steel - Square to round adapter allows connections from rectangular grilles to round ducting - Square dimensions available on 1” increments - Round dimension available on 2” increments from as small as 6” to as big as 18” in diameter (must be smaller than the square dimension)
Any available size in 3 days! Call us at 877-711-4822 if you do not see the size you need listed.