ThermoMark™ sectional steel commercial doors made to accommodate RVs, large trucks, heavy equipment, boats, trailers, and garage-based shops. Models 5150 and 5200 are the ideal choices if you’re looking for a commercial door that has a combination of strength and insulation but is also aesthetically appealing without the traditional industrial look. Then, Models 5155 and 5255 are insulated commercial sectional doors ideal for projects requiring something more rugged and durable, with excellent thermal insulation qualities. ThermoMark™ 5,000 Series is ideal for commercial or industrial applications where durability and aesthetics are required.