JTBC drive upblast roof ventilators provide high performance in a low silhouette design, with capacities to 100,000 cfm. These rugged industrial roof ventilators are constructed with a heavy duty welded steel base, galvanized butterfly exhaust dampers and a spark resistant cast aluminum airfoil axial impeller. The JBC belt drive upblast roof ventilators have a v-belt drive for quiet, low speed operation. They are ideal for exhaust of hot or contaminated air streams, including smoke fumes, and are also suitable for general ventilation applications.
NIS-CO FANS AND BLOWERS

                                                   Series connected blowers are those which have the outlet of the one blower exhausting into the inlet of another blower. By connecting blowersa in such a manner, high
static pressures can be attained. This is accomplished as the second blower adds its pressure
capability to the system, increasing the capacity beyond the capabilities of the first blower.