The EBD (Electronic By-Pass) style are self-contained units that give you the static control mounted to the damper. It is an "all-in-one" design that makes the installation process much easier than most electronic by-pass dampers. The static pressure can be adjusted in the field between 0.5 - 4 in of pressure. This is done by the turn of a set-screw. Requires 24 VAC to operate. Tubing and pitot tube are included. Round Bypass Dampers are fabricated from 24 ga galvanized steel. The rolled shells are furnished with one straight (female) end and one crimped (male) end with stiffening beads for rigidity. Round EBD bypass dampers are equipped with low leakage blade seals.