I've seen the serrated blades on some high quality industrial fans, it keeps the DB's down.
Not sure how well it would work at lower rpm's.
I've seen the serrated blades on some high quality industrial fans, it keeps the DB's down.
Not sure how well it would work at lower rpm's.
"Shake off all the fears of servile prejudices, under which weak minds are servilely crouched. Fix reason firmly in her seat, and call on her tribunal for every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason than that of blindfolded fear."
Thomas Jefferson (1743-1826)
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