LumberJocks

Repost-Is An Exhaust Fan a Requirement for a Portable HVLP Booth, Spraying Water-based?

  • Advertise with us

« back to Woodworking Skill Share forum

Forum topic by gerrym526 posted 1687 days ago 1984 views 0 times favorited 13 replies Add to Favorites Watch
View gerrym526's profile

gerrym526

265 posts in 2405 days


1687 days ago

Topic tags/keywords: finishing spray gun

Guys-this is a repost of this topic. Started it in the Safety forum, but this is probably the right place to get an answer.
Will be starting into spraying with an HVLP unit I recently purchased. In reviewing articles and videos on HVLP, the portable spray booth designs (usually big pieces of cardboard with duct tape) all had a cheap window box fan at the rear of the booth, covered with an inexpensive fiberglass furnace filter.
Here’s my issue-do I need the fan? I’ll be spraying only water based finishes and using a respirator with organic filters. I’ve rigged up a knock down setup of heavy shower curtains on wood closet rods to cover 3 sides of the spraying area. I’ll be using a heavy canvas drop cloth on the floor to keep finishes off the tile.
I can’t use a fan in my small basement shop without risking having any overspray it draws out end up on my stationary tools. Was told by the manufacturer of the HVLP unit (Apollo), that overspray with this turbine unit is minimal and shouldn’t be an issue like it is with a high pressure gun.
Am I OK without the fan, or do I need to wait until summer to use the HVLP with a fan-based spray booth in my garage.
It’s cold and snowy here in Chicago, and will be until April!
Thanks for the help.

—Gerry

-- Gerry


13 replies so far

View WayneC's profile

WayneC

12246 posts in 2694 days


#1 posted 1686 days ago

Anyone?

-- We must guard our enthusiasm as we would our life - James Krenov

View Ger21's profile

Ger21

614 posts in 1728 days


#2 posted 1686 days ago

I spray waterbase in my garage with an old Wagner Finecoat. I don’t know about the Apollo, but my garage gets pretty filled with overspray. In the winter, As soon as I stop spraying, I open the doors for a few minutes to let the overspray out, then close it back up and turn the heat back on.

I don’t cover my table saw or other tools while spraying, though, as the overspray is not much different than normal wood dust. But the floor around the parts I’m spraying gets a lot of finish on it.

Not sure if any of this info helps you or not. If it were me, I’d probably use a fan and a filter. Better yet would be two fans. Also, I think the filters will clog up pretty quick, if you’re spraying a lot.

-- Gerry, http://home.comcast.net/~cncwoodworker/CNC_Woodworker.html

View lew's profile

lew

9938 posts in 2352 days


#3 posted 1686 days ago

I am not an expert, nor do I play one on TV.

Seems to me you have addressed the two main concerns of water based finishes. The respirator (and eye protection) should keep you body safe from the over spray/air born particles. The shower curtains will contain the same. I would add a forth side to your spray booth to completely enclose it and make sure the curtains are as close to the ceiling as possible to reduce the suspended particle escaping on natural air currents. The fan, although a nice touch, would not be necessary- IMO.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View huff's profile (online now)

huff

2782 posts in 1882 days


#4 posted 1686 days ago

Jerry, The shower curtains will help contain the overspray and the respirator helps you. Even with an HVLP system, you will experience overspray. Usually a fan is used to pull the overspray from your spraying area and exhaust it outside, so unless you are setting your fan in front of an open window or door, there’s not much need to have it. If you use a fan, I do recommend you use a filter with it. Two reasons: one, it will collect a lot of the overspray, and not just blow it out the door or window, and second, it will keep a lot of the overspray out of the fan motor. You shouldn’t have a problem with overspray on your equipment, but like Ger21 said, you will get a lot of finish on the floor around where you are directly spraying. I usually put a piece of cardboard or plastic down first and have my project sitting on something to keep it off the floor. I’m too old to bend over that far! lol. Good luck.

-- John @ http://www.thehuffordfurnituregroup.com

View SteveMI's profile

SteveMI

845 posts in 1891 days


#5 posted 1686 days ago

I paint in my garage, but use a dryer exhaust fan to move the overspray through a garage window. I push the window up and put a panel in with the flexible tube attaching to my paint tent. All of my painting is water base except occasional shellac.

Can you add a second exhaust from the basement like the clothes dryer? Flapper will close when not pushing air through.

Steve.

View gerrym526's profile

gerrym526

265 posts in 2405 days


#6 posted 1686 days ago

Guys,
Thanks much for the info, it has been very helpful.
Steve-there’s no way I can add an exhaust fan to my shop without having to punch through a brick wall of the house. My shop has no windows, and the nearest window is across a hallway in the laundy room. I was a good idea however.
I will use the shower curtains, and painter drop cloth on the floor set up-should work fine until warm weather comes back, and I can move a portable spray booth to the garage.

-- Gerry

View BentheViking's profile

BentheViking

1746 posts in 1161 days


#7 posted 372 days ago

Glad I found this post. Trying to get ready to do some spraying next week. Will be spraying waterbased enamel in my garage and will set up some sorts of tarping/plastic possibly mounted to the garage door track (i want to keep the track and chain and motor free of overspray). I am thinking of keeping the openside right in front of the door so I can open it up and keep things well ventilated. Am I over or underthinking this?

-- It's made of wood. Real sturdy.--Chubbs Peterson

View firefighterontheside's profile (online now)

firefighterontheside

3249 posts in 454 days


#8 posted 372 days ago

I think even in the basement you could still use a filter to take over spray out of the air. Maybe only turn fan on low so you don’t spread over spray too far.

-- Bill M. I love my job as a firefighter, but nothing gives me the satisfaction of running my hand over a project that I have built and just finished sanding.

View NiteWalker's profile

NiteWalker

2700 posts in 1174 days


#9 posted 372 days ago

I spray mostly waterbornes in my garage and I don’t tarp anything. The project goes on a cart in front of the open door for spraying; on the wall behind me I have a 20” box fan blowing fresh air inside. Works great.

-- He who dies with the most tools... dies with the emptiest wallet.

View joeyinsouthaustin's profile

joeyinsouthaustin

1211 posts in 670 days


#10 posted 372 days ago

Besides overspray… think about drying. A good, clean, gentle air movement is great for good curing. In all my smaller shops, the spray area was the curing area, this is where setting up the fan will also be important?? IMO

-- Who is John Galt?

View MrRon's profile

MrRon

2716 posts in 1841 days


#11 posted 372 days ago

A fan is good to exhaust paint spray, BUT at the same time, that fan will be carrying airborne dust particles that can settle on your painted project. Try to keep the air flow as low as possible.

View NiteWalker's profile

NiteWalker

2700 posts in 1174 days


#12 posted 372 days ago

IME, waterborn paint and clear coats dry so fast that the dust is rarely an issue except for humid days.

-- He who dies with the most tools... dies with the emptiest wallet.

View joeyinsouthaustin's profile

joeyinsouthaustin

1211 posts in 670 days


#13 posted 371 days ago

His fan, with the filter attached, is great for creating a light air flow, and if it is bringing air into the area, that is exhausted out, it is bringing in clean air. A positive pressure in the room will help keep particles from moving into the area. In open shop spraying, I have pointed my three filtered fans across pieces, to blow settling particles away from piece.

-- Who is John Galt?

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase