roof ventilators


Upblast Tubeaxial Roof Ventilator,
Belt Driven (Commercial)


The BSB40 tubeaxial roof ventilator provides cost-effective, general-purpose ventilation of commercial buildings. The BSB40 features a heavy-duty, galvanized steel stack cap with butterfly dampers to discharge air upward and prevent recirculation into the building. A splash guard located over the damper pivot area also protects against rain entry.

Sizes (impeller diameters)

  • 14 to 54 inches (355 mm to 1,375 mm)


  • Airflow to 67,400 CFM (114,500 m3/hour)
  • Static pressure to 1.5 inches w.g. (370 Pa)