Low-Profile Troffer, Reflective White Polyester Finish, Cold Rolled Steel Housing Material, 4 ft Length, Made in USA, +25 °C Maximum Operating Temperature, Deep Reinforcement Ribs Provide Added Strength;Gasketed Door Frame Features Offset Mitered Corners To Eliminate Light Leaks;Integral T-Bar Clips Quickly Secure Fixture To Structure Special Features, cCSAus Certified Standards Met, 5 yr Warranty, 2 FT Width