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Re: [APD] Canopy Cooling

S. Hieber wrote:
> A 6.7" (175 mm) fan can surely deal with that much airflow
> and hum along in the 47 db neighborhood. But I'm inclined
> to say that, if a 4" fan performs that way, buy all you can
> get your hands and expect to make a fortune -- you might
> have the exception to the laws of physics or at least a
> serious warp in the fabric of space and time? Otoh, perhaps
> they only measured sound in a particular bandwidth or from
> ten or 15 feet away, or maybe it's not a ground plane
> measurement, or who knows . . . ?

The Panaflos are measured at 1m on the intake side mounted in an 
antiechoic chamber. You can read more than you ever wanted to know about 
them here: 

Jerry Baker
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Aquatic-Plants at actwin_com