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my shop is humidity controlled, so drawing air thorugh is not a problem.

Terry, can you filter before the fan and run the air back into the shop? That way you have a circulating system and you won't have to worry about depleting your shop of your induced humidity.

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You can't remove VOCs from the air with a common filter so pumping it back into the shop would be hazardous and defeat the intended purpose.

I run my spray booth only when spraying, and then shut it off and let the humidifier/de-humidifier condition the new air.

Unless you have a booth the size of a garage, I don't see the need for 3500 CFM ... it will be sucking most of what you are spraying out the vent - a small booth only needs 7-800 CFM and it will clear it pretty fast.

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Terry,
    I would recommend you using a unit that will handle 750 - 800 CFM
rather than that large of a unit, Bigger is not always better. You'll find that
a smaller fan will create plenty of movement to purge the room quickly
and efficiently without creating a draft great enough to present its own
problems.

    To circulate the air back into the shop would eventually cause you
great health problems...not mention the passing out and falling over from
breathing in the VOCs that are pumped back in.

   Your humidification will catch up in plenty of time after your fan goes
off to avoid your woods being affected. I switch my fan on when i'm
heading into my booth and back off immediately upong finishing and
coming out.

    I did the same when I was using nitrocellulose lacquer before switching
to the UV cured poly that I use now. Once the UV finish is cured by the
light unit, there is no odor or evidence of the solvents.

    Just make sure that your booth is close tight if you're using lacquer so
the smell isn;t able to creeo into the main shop area. If you can smell it, it
getting into you and isn't safe so you don't want to be getting a whiff of
our finish at any time before, during or after spraying.

Regards,
Kevin Gallagher/Omega Guitars

Thanks for the post Kevin and Barry. Sorry for the bad advise Terry.

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