One 90 vs two 45s in an air duct. Which is better? @LandtoHouse
One 90 vs two 45s in an air duct. Which is better?  @LandtoHouse
Uploaded February 2024 | Updated September 2026, 2 weeks ago
I am setting up a laser engraver fume extractor and looking for the best air flow out the 6" duct pipe. Looks like two 45's are better than one 90 turn.

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One 90 vs two 45s in an air duct. Which is better?

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