Reply by clagwell

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Posted on Boots and hoods versus straight duct efficiency

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325 posts in 711 days

#1 posted 09-29-2020 05:35 PM

HVAC boots are designed for air flowing OUT of the boot. For dust collection the air flows IN. Flow patterns and losses are completely different between the two.

The most efficient entrance is a Bell Mouth. That is, a round opening with a rounded edge:

Pressure loss at the entrance will vary with the inverse fourth power of the diameter, so bigger is better.

-- Dave, Tippecanoe County, IN --- Is there a corollary to Beranek.s Law that applies to dust collection?

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