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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 “Retro”  Delta Opening 14-71 and some 8-71  -  They Require our Setback plate  -

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