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Butcher · 02-01-2005, 06:01 AM

Not generally possible to vary AC fan speed as it's based on the frequency of your mains power.
Big fans will push more air for the same noise and do it better against a restriction so in a sealed box system that can be good.
Blowers have great pressure handling compared to axial fans but tend to be lower airflow and quite noisy.

02-01-2005, 06:01 AM	#9
Butcher Thermophile Join Date: May 2001 Location: UK Posts: 1,064	Not generally possible to vary AC fan speed as it's based on the frequency of your mains power. Big fans will push more air for the same noise and do it better against a restriction so in a sealed box system that can be good. Blowers have great pressure handling compared to axial fans but tend to be lower airflow and quite noisy. __________________ Once upon a time, in a land far far away...