External motor with belt drive; adjustable pulley ratio for variable operating conditions - ideal for high-temperature exhaust and air containingoil mist, smoke, moisture, or dust.High-temperature gas exhaust, industrial fume extraction, and dust-laden air handling.Available withsingle-phase (S) or three-phase (T) motor.Corrosion-resistant stainless steel casing available upon request; standard steel plate not suitable for acid- or alkali-corrosive environments.