Warranty Period: 12 months from startup or 18 months from shipment by manufacturer, whichever first occurs. PRODUCTS MANUFACTURER Basis-of-Design Manufacturer: Provide fan units manufactured by Twin City Fan & Blower, Minneapolis MN; (763) 551-7600; email: . website: . Source Limitations: Obtain tubeaxial fans from a single manufacturer. PERFORMANCE REQUIREMENTS Fan Performance Ratings: [Project site elevation- based] [Sea level elevation-based]. Specifier: When required, retain the following paragraph. UL Compliance: Provide units that comply with requirements of UL 705. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70. TUBEAXIAL FANS Specifier: Select fan drive in the following paragraph. If both drive types are required, include that requirement in the drawing fan schedule and delete it here. [Belt] [Direct]-driven fixed-pitch airfoil axial fans, configured for horizontal or vertical flow of relatively clean air for Heating, Ventilating, and Air-Conditioning (HVAC) applications, for air containing dirt, moisture, or hazardous fumes, or for air at elevated temperatures. Basis of Design Product: Twin City Fan & Blower, Model TCTA. Permanently attach nameplate displaying serial number and unit information. Fan Capacities, Characteristics, and Configuration: Refer to Drawing schedule. Fan Wheel: Solid, one-piece casting of 319 alloy aluminum, containing seven blades and integral center hub. Wheel Blades: Airfoil shape designed with variable hub ratio system to allow selected fan to operate at highest efficiency possible. Machine wheels to proper diameter so that blade tip clearance is within tolerance necessary to ensure certified fan performance. Secure to fan/motor shaft with Trantorque or taperlock bushing. Specifier: Retain the following paragraph only for belt-driven fans. Fan AISI 1045 steel, turned, ground, and polished steel. Select shaft diameter so that first critical speed is minimum 1.43 times maximum operating speed. Finish with petroleum-based rust protectant. Specifier: Retain the following subparagraph when the fan is handling dirty or wet air, or air carrying corrosive gases.
Warranty Period: 12 months from startup or 18 months from shipment by manufacturer, whichever first occurs. PRODUCTS MANUFACTURER Basis-of-Design Manufacturer: Provide fan units manufactured by Twin City Fan & Blower, Minneapolis MN; (763) 551-7600; email: . website: . Source Limitations: Obtain tubeaxial fans from a single manufacturer. PERFORMANCE REQUIREMENTS Fan Performance Ratings: [Project site elevation- based] [Sea level elevation-based]. Specifier: When required, retain the following paragraph. UL Compliance: Provide units that comply with requirements of UL 705. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70. TUBEAXIAL FANS Specifier: Select fan drive in the following paragraph. If both drive types are required, include that requirement in the drawing fan schedule and delete it here. [Belt] [Direct]-driven fixed-pitch airfoil axial fans, configured for horizontal or vertical flow of relatively clean air for Heating, Ventilating, and Air-Conditioning (HVAC) applications, for air containing dirt, moisture, or hazardous fumes, or for air at elevated temperatures. Basis of Design Product: Twin City Fan & Blower, Model TCTA. Permanently attach nameplate displaying serial number and unit information. Fan Capacities, Characteristics, and Configuration: Refer to Drawing schedule. Fan Wheel: Solid, one-piece casting of 319 alloy aluminum, containing seven blades and integral center hub. Wheel Blades: Airfoil shape designed with variable hub ratio system to allow selected fan to operate at highest efficiency possible. Machine wheels to proper diameter so that blade tip clearance is within tolerance necessary to ensure certified fan performance. Secure to fan/motor shaft with Trantorque or taperlock bushing. Specifier: Retain the following paragraph only for belt-driven fans. Fan AISI 1045 steel, turned, ground, and polished steel. Select shaft diameter so that first critical speed is minimum 1.43 times maximum operating speed. Finish with petroleum-based rust protectant. Specifier: Retain the following subparagraph when the fan is handling dirty or wet air, or air carrying corrosive gases.
tcta-specification-233423.03-axial-roof-ventilators.docx