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Low Profile Filtered Hooded Roof Ventilator, Direct Drive


The LHDF Low Profile Filtered Hooded Roof Ventilator provides cost effective, general purpose ventilation of commercial buildings, with a pleasing low profile design that minimizes extension above the roof line. A wide array of adjustable pitch, cast aluminum impellers are available to meet specific performances and application requirements. Twin City Fan & Blower also offers a complete line of options and accessories such as roof curbs, backdraft dampers, disconnect switches and special coatings.

Sizes (impeller diameters)

  • 21 to 48 inches (535 mm to 1,220 mm)


  • Airflow to 30,400 CFM (51,600 m3/hour)
  • Static pressure to 1 inch w.g. (250 Pa)