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Big Air Volume 50inch Greenhouse Temperature Control Exhaust Fan Heavy Hammer Fan. Durable Galvanized Material: Body made of rust-proof thickened galvanized sheet with U-shaped blades. Heavy Hammer Louvers: Automatically opens and closes via heavy hammer mechanism for ventilation. Manual Override Capability: Can be manually opened via pull ring during power outages. Wide Application Scope: Ideal for greenhouses, workshops, animal husbandry, and industrial cooling. Global Safety Certifications: Passes CE, UL, RoHS, and REACH certifications for worldwide safety. Flexible Customization: Supports OEM/ODM, full customization, and minor customization options.