On Thursday, 3 May 2018 18:07:49 UTC+1, Johnny B Good wrote:

The other option of running the generator inside a soundproof box brings
a whole new set of problems such as providing the necessary ventilation,
usually using a large fan or two to provide forced ventilation. Not only
does the power consumption of a large fan reduce the net power available,
the ventilation provision (fans and associated vents) often severely
compromises the soundproofing benefit of the enclosure which ideally
should be fabricated from brick or concrete panels with sound absorbers
installed within (but not applied as panels completely covering the walls
to act as counterproductive thermal insulation).

I saw a lot of such ill conceived attempts at enclosing generators in
such housings, intended to trap the noise emissions, on youtube and the
use of lightweight materials was the predominant error in their design.
There's a lot to be said for the KISS approach to this problem (aka,
intelligent use of sound deflector panels). In short, all these youtube
videos of "Generator dog houses" were, in essence, best regarded as "How
Not To" videos for all the help they were. :-(

The principle is known & simple enough. Provide a sepentine path for the sound, ie at inlet & outlet. I would have though the exhaust would be capable of driving ventilation.


NT