Galvanized steel venturi construction. Low profile galvanized steel dome has galvanized steel mesh grill to protect against insects, birds, and rodents yet allows adequate air intake. Motor is UL & C-UL listed; thermally protected with built-in, automatic cut-off; engineered to run cool for long life; automatic adjustable thermostat. Precision balanced aluminum fan blades for minumum vibration. 6-
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