Selas Air Ductors
Selas Air Ductors (Product No. 4201) are useful for supplying large volumes of air at pressures of 1 psig or less when high-pressure factory air is available at steady pressure.
Because high-pressure factory air is relatively costly, it usually is less expensive to use a blower if the air requirements are continuous. However, for occasional use or where excess compressed air is already available, Air Ductor regulators are initially less costly and very easy to install.
The Selection Table shows the approximate volume of low pressure air (1 psig) that various sizes of Air Ductors will deliver. It also shows the high-pressure air orifice size to be used with various inlet air pressures. When operating at capacities shown and 1 psig delivery pressure, about 25 – 35% of the total delivered air will be high-pressure air (measured on a free basis). See pages 2 and 3 of the attached PDF for capacity of high-pressure air orifices. At lower delivery pressures, the ratio of high-pressure air will be less than indicated above.
Air Ductors, as combustion air pressure regulators, are particularly useful for supplying the combustion air requirements of a single Flomixer or group of burners. No valves or blast gates should be used between the Air Ductor and the Mixer or Mixers it is supplying. If volume controls, either manual or automatic, are required, they should be placed in the high-pressure air supply.
Air Ductor Assemblies include Hijector, valve, gauge (0 – 30 psig standard), and expanding coupling on outlet end of Hijector, which determines the outlet pipe size to use.
