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Read our privacy policyTriangle's FHIR series industrial-grade true reversible wall fans are designed to meet the demands of applications that require both supply and exhaust airflow from a single unit. Available in belt and direct drive configurations, these fans offer unmatched flexibility and reliability in commercial and industrial environments. Belt-drive models come standard with pillow block bearings for smooth operation and specially engineered airfoil blades that eliminate the performance limitations typically found in conventional reversible fans