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Off Gas

8/9/17       
WCW Chris Member

Website: http://waukeecabinetworks.com

We have been spraying in a building bay for over a year but we just recently got our spray booth and exhaust fan functional. It's a booth with a wall of (35) 20"x 20" filters. We have about a 24" diameter exhaust fan. We spray SW conversion varnish. Now that we are fully functional we have a lot more off gas when open the bay in the morning. It's almost like tear gas walking in there. We suspect it may be coming from the filters? Do we need to concerned that it's flammable? We plan to add heaters for winter.

8/9/17       #3: Off Gas ...
Leo G

Ya, the filters will hold the smell. It's just the solids that get caught in the filter.

I'm sure it's flammable, the filters themselves are flammable.

8/9/17       #4: Off Gas ...
al

This is somewhat relevant to your post. I have an outbuilding that after I spray I let parts sit in there for a few days until everything off gases. Seems to work fine
in spring, summer, fall. The building has no heat. If I spray and let parts cure for 4 to 6 hours at 70 degrees will it hurt putting parts in outbuilding in lets say January? Located in North NJ.
I know what you mean when you say CV is like tear gas, my eyes water when I'm around the parts that have been sprayed the day before.
Thank you,
Al

8/9/17       #5: Off Gas ...
Leo G

CV needs to be above 65º for the whole cure period or it won't cross link properly.

8/9/17       #6: Off Gas ...
rich c.

You sprayed conversion varnish for a year with no spray booth? Holy crap! Good luck with your health in the future.

8/9/17       #7: Off Gas ...
nick

chances are what's making your eyes burn is the formaldehyde out gassing, which means your using SW's waterwhite CV or using catalyzed fast dry vinyl sealer or both. If so you may want to try SW's F3 formaldehyde free CV; it dries faster, sands better and feels smoother than the waterwhite and of course has no formaldehyde for you or your customers to breath...that said on the down side it's a little less tough and it still out-gases something noxious for 24 hours or so...but it's not near so bad as the waterwhite.
And Leo is right above 65 degrees for the full cure period which I believe 24 hours for both of SW's CV products.

8/10/17       #8: Off Gas ...
Adam

24" fan is small for most booths unless its high volume. You may not be pulling the last remaining fumes out of the booth. I like to let it run for atleast 10 minutes after I stop spraying. I think it helps with drying, keeps the dust off the product.

Also notice the overspray that is hitting the walls of the booth. Without enough fan it may tend to collect on the walls.

8/10/17       #9: Off Gas ...
JM

We have an 8x10 open face booth and we ordered it with a VFD so we have speed control. When done for the day, we turn it down to low and leave it running for the night. Next morning, cant tell anything was sprayed. The smell is not just from the filters, its off gas from all the sprayed parts that are curing.

Sounds like its a home made spray booth. If so, in addition to the 24" fan. add another smaller fan that you could leave running all night to continue to evacuate fumes from curing, or if possible add a speed control to your 24" fan so you can just turn it down for the night.

8/10/17       #10: Off Gas ...
chris

buy yourself a dwyer vaneometer. about $35
you can measure the air speed in your booth.
You want 100 feet per second.
i think your fan and ducting is too small.
my booth has 16 20x20 filters with a 24" fan and duct.

8/10/17       #11: Off Gas ...
Leo G Member

100 feet a second? He'd be sucked up to the filter wall LOL

100 feet a minute.

8/10/17       #12: Off Gas ...
Bart

Nothing like a face full of formaldehyde in the morning. I like JM's idea of a low speed exhaust fan overnight. And store in a well ventilated area until you deliver to the jobsite. Switching to WB was the best thing I ever did.

8/11/17       #13: Off Gas ...
Adam

The only thing worse than wearing a respirator when spraying cv, would be sanding cv the next morning wearing a respirator.

The 36" belt driven fans allows you to control the speed of air much better. It pulls more air at a lower fan speed from a larger wall area so you get much better ventilation. Its adjustable by simply changing the pulley's.


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