Metal Industries Inc, US Aire model 1410AD. 20 x 36 wall opening 22 x 38 outside dimension. Steel const, painted white, concealed hinges, 1/2 stamped face 1/2 solid panel called access panel/filter grille. Free freight on this item in the continental U.S.(UPS Ground) Items are new and unused in original box. Please call (952) 884-8266 with questions call (612) 518-6683 After 5:00 and on weekends. I ship nationwide. Minnesota residents will be charged sales tax.