... corrosion resistant wire helix, forming an air tight, easy to use, quality air connector. The product comes conveniently boxed ... hydroponics exhaust system,HVAC , rang hood ,clothes dryer vent ,inline fan air vent ,roof ventilation , ventilator use ,And so on.Low ... applications including bathroom fans , furnace mounted humidifier units, air conditioning and ventilation system.Diameters 3” to 29” ( ...