Originally Posted by 8051
He never stated it only applied to consumer fans. I believe Sunon, SanAce and Delta provide full disclosure as to the methods by which they test their fan specifications as well as the equipment used.
If you are referring to me, I never said it applied to applied to commercial fans in any way shape or form. Sunon, SunAce, Delta, Nidec-servo, etc all give good data. Any time I've wanted to see a P/Q curves for one of their fans it's been available.
It seems you have a problem understanding English. You missed or misinterpreted many of the replies to your posts;#28 8051
"I had thought that for exhaust fans, static pressure wasn't as important as CFM?"#29 doyll
in part: "Fan specificatons are rather meaningless.
Functional airflow is the amount of air a fan can move against resistance.
Static pressure rating = the pressure level a fan reaches when air stops moving (resistance stops airflow).
Airflow rating = amount of air fan moves in free airflow (like a ceiling fan does .. no resistance at all).
you went off on the "Fan specifications are rather meaningless." without understanding what I was saying.#31 ciarlatano in part
"doyll is very obviously referring to the open air specs with no regulated testing procedures"#32 doyll in part
" Delta and SanAce are industrial fan companies and industrilal fans specifications are very different from consumer fan specifications. Their testing is based on in-use applications, not airflow when mounted in open space at full speed airflow or pressure made when flowing no air." and supplied graphs showing how consurmer fans cfm and mmH2O rating are misleading.#33 8051 repllies to ciarlatano saying I was referring to consumer not commercial fans
"I didn't make the statement fan specifications were "meaningless", a statement which is obviously patent BS."
Which all seems to show you did not understand what either of us was trying to say.
You did not seem to understand any of what others and myself were saying about fan cfm and mmh2o specifications having little meaning as to how well the fan would perform in actual use.
I'm sorry if I offended you. I was only trying to explain how fan specifications do not accurately show us what their airflow will be in actual use, especially consumer fans.Edited by doyll - 10/5/16 at 4:33am