Ductoglass To deliver conditioned air generated by cooling, heating or dual temperature systems. Designed especially for heavy-duty installations. Can also be used in small, commercial or single-duly installations. Ductoglass Metal HE: Used in systems to deliver conditioned air and ventilation at operating speeds up to 18m/s (3,540 feet/min.) and at a static pressure of 800 Pa to -800 Pa. Accommodates high air speeds with low pressure loss. Ductoglass Gold: Used in systems to deliver conditioned air and ventilation at operating speeds up to 30.5 m/s (6.000 fpm). Designed for heavy-duty installations and high velocities.