The “Knight” shelter has an inside base measurement of 7’6” x 7’6” and a roof height of 7’6”. The “Knight” shelter has 56.25 sq. ft. of floor space and has a diagonal measurement of 10’4” corner to corner. A 30” x 69” walk-in door, lift lugs, inner tie-downs, anchor holes in the base flange and R-10 urethane insulation all come as standard features. Walls are slightly tapered from bottom to top to allow nesting one inside the other for transporting. Options include louvered vents, plexi-glass windows, gas detector inspection doors, panic hardware, hinged roof hatch, roof turbines, and custom coloring. Explosion proof CATA-Dyne heaters may also be included with your purchase. As with all products manufactured by D & G, only high quality virgin polyethylene is used.