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Re: [APD] Building a new hood
> Putting one fan blowing in and one blowing out is the
> equivalent of stacking one fan on the other in terms of
> airflow. Stacking fans like that does increase the
> airflow--it's like stacking two water pumps in series; the
> flow doesn't increase. You would be better off having two
> fans blowing in or two fans blowing out (parallel) -- that
> will double the airflow provided there is adequate sized
> intake and exhaust ports.
> Fans are stacked on personal computer cases sometimes for one
> of two reasons: 1) to ensure a particular direction of
> airflow (for example, to ensure that the airflows past the
> the cpu fan) and 2) to market to overclockers that think more
> or something is always better.
This is exactly what I was thinking. When I built a custom MH hood
(much hotter), I wanted directional airflow like in a computer. I
wanted the air to flow over the bulb and out the other side. And you
are out of touch with computer modding, since air-cooling is what newbs
use ;). The newest thing is water cooling with radiators and pumps.
> As Nicholas points out, there's no point trying to move air
> one way at one end unless you have an opening for the
> opposite air flow at the other.
> I've found that vented hoods, along the design of those that
> AHsupply.com sells do as well passively, by convection, as
> enclosed hoods with a single fan. I'd try a vented hood
> first, and add a fan if mere convection proves inadequate in
> your situation. Passively cooled hoods are much quieter ;-)
Two fans blowing in across the lights w/ vents routed in the top would
be quite efficient for something like PCFs.
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