Problem in hood designing

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saadat68

Well-known member
Joined
Aug 7, 2016
Messages
482
Hi
I make a hood with this design :
http://goldrefiningforum.com/~goldrefi/phpBB3/viewtopic.php?f=40&t=19965

But I didn't know that I can't add any fittings over the hood (just can add a 45 degree fitting). I need add minimum five 45 degree fittings
So I must change my design. If I add a second blower can I solve the problem ?

Which design has more air speed in pipe number 1 ?
If I have lower speed than first design (first image) hood doesn't work


yja3_fdeg7.jpg



o2bw_fr5875_-_copy.jpg
 
View attachment dual fan hood.pdf

This is a sketch of using the smaller fan to power the hood and a larger fan to increase the push to overcome length of run and fittings. The smaller blower should be about 4" and the hood exhaust 6" and the larger blower 8". The good part is they are all regular metal squirrel cage blowers as they are not in the fumes.

The air supply for both fans is best if it comes from outside the building so they are not fighting with each other and the hood for air.
 
Thanks
If I must add 3 meter pipe on the roof I think it is better add straight pipe and maybe another time I use this design
 
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