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    How to identify a Delta Opening RETRO Blower “ Requires a Setback Plate

    This is an illustration of what is referred to as a β€œRetro”  Delta Opening 14-71 and some 8-71  -  They Require our Setback plate  -  https://www.alkydigger.net/proddetail.php?prod=BFM-BB1002

    Speeds up the air flow and makes it come out of the front, so you re-center the blower on the intake.