FUMES DON’T STAND A CHANCE The Prism Direct Exhaust Fan is a light weight; welding fume exhaust unit designed to remove welding fumes from air restricted locations. The sturdy handle and base makes the it easy to move and place anywhere on a job site. Extraction Reach - Select hose extensions for a maximum reach up to 32 ft. (9.7 m). Airflow - Additional hose extensions facilitate airflow conditions up to 765 CFM. Quiet Operation - Operates at a sound level of 69dB(A).