J&D Manufacturing Twister Exhaust Fan – 20"

J&D Manufacturing's Twister Exhaust Fan has been a trusted barn and greenhouse ventilation staple for over 20 years. Built with a heavy-gauge galvanized steel housing and a direct-drive motor, the Twister delivers dependable, low-maintenance airflow in demanding agricultural, greenhouse, and industrial environments. Available in 12", 16", 20", and 24", each unit ships fully assembled - just cut your rough opening, mount, and wire. The 18-gauge galvanized butterfly shutters open effortlessly at startup and spring shut when the fan is off, creating a tight, draft-free seal against debris, moisture, and pests. Features & Benefits Galvanized Butterfly Shutters: 18-gauge galvanized shutters with adjustable positive draft-free closure open automatically at startup and seal tight when off, blocking debris, moisture, and pests. Direct-Drive Motor: No belts or pulleys means fewer wear points and lower maintenance requirements over the life of the fan. Hinged Rear Guard: Remove just two bolts and swing out the entire fan assembly for fast, easy cleaning and maintenance access. Balanced Aluminum Prop with Zinc-Plated Hub: Precision-balanced for smooth, vibration-free operation and long bearing life. Variable Speed Compatible: Most models support variable speed control for precise airflow management across seasons. Fully Assembled: Ships ready to install - cut the rough opening, attach to the structure, and wire. No additional assembly required. Optional Weather Hood: Galvanized weather hood available to protect the fan from harsh weather and severe wind-driven rain. Broad Application Range: Ideal for dairy, poultry, greenhouse, industrial facilities, garages, workshops, and farms. Technical Specifications Part # Size HP Volts Amps Phase RPM CFM @ 0" SP CFM @ 0.05" SP CFM @ 0.10" SP CFM @ 0.15" SP CFM @ 0.20" SP Rough-In Dims VFT141130 12" 1/10 115/230 1.42/0.77 1 1,725 930 850 780 660 460 13¾" x 13¾" VFT141131 16" 1/3 115/230 3.8/1.9 1 1,725 2,310 2,190 2,050 1,590 1,240 18" x 18" VFT141132 20" 1/3 115/230 3.8/1.9 1 1,725 3,120 2,930 2,630 2,210 1,990 21½" x 21½" VFT141133 24" 1/2 115/230 4.8/2.4 1 1,725 4,820 4,640 4,470 4,290 4,100 25¼" x 25¼"