On Fri, 11 Jan 2019 14:00:02 +0100, Axel Berger wrote:

> Martin Gregorie wrote:
>> for a case with a ventilation hole on top,
>
> And never forget that ventilation at the top is useless without
> corresponding openings at the bottom and vice versa. I say this this,
> because I've seen that kind of silliness. Often there are openings at
> the bottom, where you can't see them, but a nice, shiny, and totally
> closed top.
>
Fair comment - and equally applicable to fans as well as chimneys.


--
Martin    | martin at
Gregorie  | gregorie dot org

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