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HTB100 AC High Efficiency Electric Industrial Centrifugal Ventilation Extractor Ring Air Blower. Thick cast aluminum body with high-strength impeller, corrosion and rust resistant. Filter screens and sound insulation cotton installed at inlet and outlet to trap particles. Supports 220V/380V and 50Hz/60Hz for versatile global application. Suitable for woodworking, papermaking, packaging, food, textile, and sewage treatment.