Aerotech Wf Dragonfly Fans WF50 & WF54 with Dragonfly® Damper Belt Drive fans Four door damper on a Wf series fan The WF Series fans use high quality components and precise engineering to create a simple, high quality fan with optimal performance at the best price. The newest feature on the WF50 is the patent pending Dragonfly® Damper. Designed to maximize the fans spiral airflow pattern offering unsurpassed airflow and efficiency. The cast aluminum drive assembly utilizes enclosed automotive style bearing and comes with a 7 year limited warranty. This feature along with the automotive style belt tensioner and heavy duty galvanized steel propeller promotes top performance. The MONO-STRUT offers strength and durability in a simple design. Patent Pending 4 door design which optimizes spiral airflow. PRODUCT INFORMATION 4 door design for maximum performance Superior weather protection Flush mount interior guard Cast aluminum drive assembly withlimited 7 year bearing warranty Automotive style belt tensioner Heavy duty galvanized steel propeller Galvanized steel fan housing Single or 3 phase high efficiency motor MONO-STRUT for strength and durability Drive Assembly The cast aluminum drive assembly utilizes enclosed automotive style bearing and comes with a 7 year limited warranty. An aramid-fiber V-belt provides superior durability. Unique Door Spring Unique constant force stainless steel springs allow doors to open fully when the fan is on and close consistently when the fan is off. Rugged Door Seal Weather tight seals for energy savings. Outer edge of doors close tight against a rugged bulb seal, not a cheap foam gasket. The hinge area between doors is sealed, unlike typical butterfly dampers. Flush Mount Housing Installs flush to inside wall. Inlet guard does not extend into building and is easy to remove for maintenance. Performance Information: Fan complete with flat-sided discharge cone, Dragonfly® damper and guard 0.0″ SP 0.05″ SP 0.10″ SP 0.15″ SP 0.20″ SP Catalog Number Prop Dia. Motor HP Max BHP CFM CFM Watt CFM CFM Watt CFM CFM Watt CFM CFM Watt CFM CFM Watt Airflow Ratio Bess Lab. Test No. WF501VCD 50″ 1 1.29 27,000 25.2 25,200 22.7 23,200 20.4 21,000 17.9 18,800 15.7 0.75 7401 WF5015VCD 50″ 1.5 1.70 30,100 20.4 28,500 18.7 26,900 17.1 24,600 15.1 22,300 13.4 0.78 7188 WF541VCD 54″ 1 1.35 29,800 27.8 28,100 24.5 26,400 21.9 24,200 19.3 21,900 16.7 0.78 7394 WF5415VCD* 54″ 1.5 1.74 31,700 24.3 30,000 22.2 28,300 20.0 26,300 17.7 24,100 15.6 0.80 7396 WF542VCD† 54″ 2 1.98 33,400 22.4 31,900 20.7 30,300 18.9 28,600 17.0 26,800 15.4 0.84 7397 *Performance values of these fans at 0.0″ S.P. exceed the BESS Lab test capabilities and were calculated through regression analysis of CFM and CFM/Watt measurements for higher static pressures. tPerformance values of these fans at 0.05″ S.P. exceed the BESS Lab test capabilities and were calculated through regression analysis of CFM and CFM/Watt measurements for higher static pressures. Notes: 1. The ratings shown are based on tests and procedures performed at the BESS Lab, University of Illinois in accordance with ASHRAE Standard 51-1999. 2. BHP values were not measured at the BESS Lab. The BHP values shown were derived from actual Watt measurements using motor efficiency values supplied by the motor manufacturers.