
Best Price Centrifugal Push-Pull Type /Heavy Hammer Galvanized Wall Side Close House Animal Husbandry Poultry Pig Equipment Exhaust Fan. Professional Factory Experience: Over 10 years of experienced factory with own motor and blade workshops. High Efficiency Stainless Steel Blades: Special designed 1.2mm stainless steel blades with BA grade finish for large air volume. Advanced Motor Protection: IP55 protection grade, F class insulation, and phase lack protection device included. Durable Shutter Design: High quality nylon fixed parts and galvanized shutters ensure long service life and stability. Lightweight Alloy Pulley: High strength aluminum-magnesium alloy pulley with blast-sanding treatment for low vibration. Comprehensive Certifications: ISO9001, CCC, CE, ETL, SGS, and BV certified by Bess Lab in USA.