BARN VENTILATION - J&D MFG       J&D Typhoon Fans 54" Aluminum Intake Shutter( 48" fan).Standard or Slant wall configuration Aluminum shutter frame with baked white enamel aluminum vanes 1" Stainless Steel Shaft Eccentric Lock Collar Bearings Square Box Design for easy installation Deep Cone to reduce back pressure and boost performance Spring loaded belt tightener on all fans Efficient 3 blade galvanized prop Balanced blade and pulley for smooth operation Matched motor & belt ratio for maximum air, without overloading the motor Cost-efficient heavy galvanized construction Galvanized 4 way mount    J&D Wall Master Heavy 18 Gauge galvanized steel housing Galvanized 4 way X-frame mount Aluminum shutter High efficiency motor - Two year warranty Eccentric lock collar, pillow block, rubber cushion base bearings Large, smooth galvanized venturi Square box design, for easy installation Galvanized fan guard mesh Belt drive fan Automatic spring loaded belt tightener Efficient 3 blade galvanized prop Balanced blade & pulley for smooth operation       J&D Twister Fan Distribute fresh air throughout building Control wide temperature ranges Control condensation Remove gases, moisture and bad odors Improve air quality Improve profits    J&D Shutter Fans 4 Sizes, 8 models to choose from Aluminum shutters, powder baked guards Dependable and durable Can be used for a small hobby green house or a midsize building Use single fans to ventilate and circulate in small structures Combine these fans with a thermostat and motorized shutters to really control the environment in your area       J&D Cyclone Fans Heavy fiberglass fan orifice, with one piece fiberglass hood Fiberglass is maintenance free, rust free, corrosion free and easy cleaning Lifetime warranty on the housing Available with aluminum or poly fan blades       J&D Tornado Fans Molded fiberglass Extremely smooth inside for low maintenance Rust free, corrosion free, easy cleaning and high performance Lifetime warranty on all housings and stainless steel mounts Poly cones available on 24", 36" and 50" fans    J&D Pit Fans Ball Bearing Totally Enclosed 3,300 RPM Single/ variable speed Stainless steel motor shaft 3/8" diameter shaft External mounted capacitor External wire hook-up 230 Volt 1400 CFM Two year warranty