The Empire Syphon Ventilator is a dependable stationary exhauster that functions efficiently in the slightest breeze. Its design utilizes every wind current to create a powerful suction through the stack, while the storm band circling the upper cone prevents rain from driving into the ventilator and adds to its exhaust capacity. Air outlet is more that double that of the stack area. Available in galvanized, copper, aluminum and stainless steel.