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Reply by Russell Hayes

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Posted on Actual numbers for comparing a long radius 90deg vs 2 45deg elbows

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Russell Hayes

46 posts in 99 days


#1 posted 09-25-2020 05:15 PM

So if I understand you have either:

1.A parallel to the ceiling and main run wye, then a 90 down (or two 45’s).

2.OR a 45 degree wye off the main pointing down then a 45 to the machine.

Option one is a superior design, even with the added 45, so you don’t get backfill in the down drop when it is not used – then a burst of debris to your impeller when opened.

Of course you can eliminate the last 45 on the drop by running your duct at an angle across the wall. However the loss of wall space may negate that design. In which case do what you have to do.

-- Have a hobby? You should have a business.


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