That is, in fact, precisely how you do it.
On Friday, July 15, 2016, Orin Eman <[email protected]> wrote: > On Fri, Jul 15, 2016 at 10:55 AM, Poul-Henning Kamp <[email protected] > <javascript:;>> > wrote: > > > -------- > > In message < > > cany2ixq6onvridofgnfkebqjdkntp7t8kue7boupxjwlcux...@mail.gmail.com > <javascript:;>> > > , "William H. Fite" writes: > > >David Kirkby scripsit: > > >> > > >> I often here of people replacing fans with quiter ones, but I suspect > > that > > >> all they really do is reduce the airflow. > > > > > >Not necessarily, Dave. The Austrian company, Noctua, for one, makes > > >extremely quiet fans with excellent airflow. > > > > ... at zero pressure differential, which is easy to do (Think: ceiling > > fan). > > > > > > Right. > > You have to look at the curves on the data sheet that shows air flow vs. > static pressure (and be careful about the static pressure scale). I found > that a 'quiet' fan would often be flowing one tenth as much air as the > original fan at the static pressure at which the original fan was rated. > > In a given instrument, you may get away with the quieter fan, but how would > you tell other than putting a thermometer inside and making a before/after > comparison? > > Orin. > _______________________________________________ > time-nuts mailing list -- [email protected] <javascript:;> > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Yes, Black lives do matter. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
