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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 βRetroβ 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.