A mounting curb is recommended for installing your roof exhauster. This 18" high mounting curb is recommended for installation in restaurant applications. It is constructed of welded, prefabricated, heavy-gauge galvanized steel with a 1.5" wood nailer and includes insulation, damper shelf and mitered 3" cant. The outside dimension of the square curb is 18 1/2".
The 621828V is for use with TXD Size 18-20 roof exhausters including single and triple phase models.