Dunno if Grainger catalogs exist in NZ but it contains useful
discussion of just such in the appendices. 

regards, Jack

---- Russell McMahon <apptech@paradise.net.nz> wrote: 
> I'm seeking to find a formula which will allow me to very
> approximately establish the pneumatic resistance of smooth walled
> ducts at modest flow rates. I know Gargoyle knows but I can't convince
> it to tell me. I'm sure more than one of the people receiving this
> also know.
> 
> This is essentially a HVAC application.
> Flow rates are in the few litres per second range.
> Temperatures are in the 0 - 30 C range.
> Wall material will ultimately be something smooth which may be a metal
> on some or all faces.
> 
> If replying to this on a list I'd be obliged if you'd also copy any
> useful answer to me directly as list servers sometimes swallow
> responses for a while.
> 
> 
> 
> regards
> 
>         Russell McMahon
>         Use whatever email address you already have for me, or else
> use.
>        CHANGE Q'S TO R'S  -->  quval@paqadise.net.nz   <--- CHANGE Q'S
> TO R'S
> 
> 
> 
> 
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