Continental Fan's UDVL Upblast Roof Ventilators provide aerodynamically efficient performance and a low silhouette design. These rugged, high quality ventilators are constructed with a heavy duty welded steel base, galvanized butterfly damper section and a spark resistant cast aluminum airfoil axial impeller. The UDVL direct drive low silhouette upblast roof ventilator requires no belts or pulleys, and is ideal where little or no maintenance is required. This aerodynamically efficient fan is ...This story is related to the following:Circulating Fans | Fan Blowers | Roof Ventilators