Bypass damper

New bypass ducting between the supply and return was installed to maintain constant pressure in the system when some of the zones are not calling and are closed.  Calculation of the correct size of the ducting is available on the EcoJay website.  Careful measurement and fitting of the ducting was essential with a trial run prior to cutting into the existing ducts to mount this piece.  The bypass duct and electric damper were purchased as one piece. 3 additional fittings (two start collars and a 90 degree bend) were required