Vacation, (kind-a) with questions

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Forum topic by Roger posted 03-29-2014 12:57 PM 1448 views 0 times favorited 24 replies Add to Favorites Watch
View Roger's profile


20928 posts in 2800 days

03-29-2014 12:57 PM

Just wanted to say hey to everybody. I am on a Shop Expansion ReModel Vacation. Dang, it’s a lotta work. Whew! Anyhoo, hope ya’ll are having fun. It may be a few weeks before I put out anything…............OK, get your minds outta the gutter, .............project wise that is… :) I’m trying to take some pics as I go, right now it looks like a cluster f_!
While doing this, I have this question for some input: (actually a couple questions) 1. Has anyone ever added a bathroom exhaust fan, or anything similar into a small “finishing” room? It may be a room about 10’ x 12’. 2. Could it be vented into part of the shop that actually has a window? 3. Could it be vented into the attic part above the shop without having to go through the roof? The attic does have many roof vents, but, does get hot up there.
Been doing a lotta head-scratching, and that has been a job, since my arms feel like they’re ready to fall off.. lol Thnx for your inputs. Always appreciated.

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed.

24 replies so far

View Sheila Landry (scrollgirl)'s profile

Sheila Landry (scrollgirl)

9228 posts in 2916 days

#1 posted 03-29-2014 01:01 PM

I am happy to hear that you are adding on to your shop. (We are ALWAYS happy to see other woodworkers expanding, I think!) I look forward to the pictures – messy or not – so we can see your progress.

Congratulations! You do such beautiful work! I can’t wait to see how you do. :)


-- Designer/Artist/Teacher. Owner of Sheila Landry Designs ( Scroll saw, wood working and painting patterns and surfaces. "Knowledge is Power"

View Greg D's profile

Greg D

238 posts in 1947 days

#2 posted 03-29-2014 01:03 PM

The code is to exhaust air to the exterior , ie thru roof or exterior wall. If codes not an issue do what you want, but obviously you’ll be exhaustung the fumes to the interior of the shop or an open but vented attic!

-- Greg D, Cen. CA, "Keep it on the Level, Do it Right the First Time!"

View Greg D's profile

Greg D

238 posts in 1947 days

#3 posted 03-29-2014 01:09 PM

The code is to exhaust air to the exterior , ie thru roof or exterior wall. If codes not an issue do what you want, but obviously you’ll be exhaustung the fumes to the interior of the shop or an open but vented attic!

-- Greg D, Cen. CA, "Keep it on the Level, Do it Right the First Time!"

View HillbillyShooter's profile


5811 posts in 2288 days

#4 posted 03-29-2014 01:15 PM

Have fun and enjoy your expansion. As for a bathroom exhaust, I live in the country so no code problem. I vented a bathroom exhaust into a very well insulated and vented attic 20-years ago and have not had any problems. Hope this helps.

-- John C. -- "Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth." George Washington

View longgone's profile


5688 posts in 3304 days

#5 posted 03-29-2014 01:29 PM

Shop expansion…oh yeah…!
When the weather is good I use a exhaust fan that I place by the window….when I fart I don’t bother to turn the fan on. If you have a finishing room then a permanent fan is good but definitely vent it outside…especially if you don’t like the smell of the finish you use. I use lacquer a lot and it definitely needs venting.

View kdc68's profile


2657 posts in 2272 days

#6 posted 03-29-2014 01:49 PM

I’ve been out of the construction trade for many years now, but my $0.02 might be still be relevant here. The purpose and code requirements for venting a bathroom exhaust fan via through the roof or exterior wall is to let moisture from the bathroom escape outside. Moisture from a shower for instance that’s vented into an attic could cause moisture problems. Those problems could be mold and rot on and within the structure (roof deck, framing, and insulation). If you live in a cold climate, that moisture could freeze in the attic space as well.
You’re situation is different though because this is a finishing room and not a bathroom, so moisture isn’t a concern. But fumes from your finishes is and perhaps the reason for needing ventilation. IMO, I would vent to outside versus another part of the shop or into an attic space.
If a bathroom exhaust fan is a plausible solution for removing finishing fumes then follow guidelines on sizing. A bathroom exhaust fan sizing (I think from what I remember) is based on CFM. Base the size of the room per the CFM rating on the exhaust fan, but IMO, I would size it over and get a exhaust fan rated for a bigger space.

-- Measure "at least" twice and cut once

View eddie's profile


8565 posts in 2610 days

#7 posted 03-29-2014 02:56 PM

Roger i would think out side for sure with the fumes involved ,,maybe one of those thur the wall vac connections ,good luck on the Expansion more room is always a good thing

-- Jesus Is Alright with me

View Bluepine38's profile


3379 posts in 3081 days

#8 posted 03-29-2014 03:13 PM

I use a bathroom exhaust fan installed to vent through the exterior wall when I use shellac and polyurethane
to finish projects in my downstairs workshop. I brush the finish, not spray, if you are spraying, you will have
to use one of the fans with a adequate cfm rating.

-- As ever, Gus-the 79 yr young apprentice carpenter

View a1Jim's profile


117090 posts in 3573 days

#9 posted 03-29-2014 03:42 PM

That’s great your expanding your shop. If your going to use flammable materials you may want to think about an Explosion Proof Exhaust Fan they cost more but they are a lot safer than using a bathroom fan. I would not vent into the attic I would definitely vent outside.

-- wood crafting & woodworking classes

View Jerry's profile


2634 posts in 1644 days

#10 posted 03-29-2014 05:15 PM

Hey Roger, I may be completely off base here, but I get the idea that you used the word “bathroom” simply because that is the type of fan, and not necessarily having anything to do with a bathroom per se. SO, if that is the case, it seems you could vent in any direction you wanted as long as you are venting to a place with adequate ventilation. You could even consider going through a side wall and using a dryer vent hose setup if the logistics make it feasible.

-- There are good ships and there are wood ships, the ships that sail the sea, but the best ships are friendships and may they always be.

View MyChipCarving's profile


604 posts in 3121 days

#11 posted 03-29-2014 05:37 PM

Hi Roger,
When I built my shop and small finishing room, I installed a central exhaust fan used venting multiple bathrooms in a house. It delivers a lot more CFM than a single bath fan. Also, as Jim mentioned, when considering explosion proof, I found that the main element for explosion prrof was that it did not have metal parts that could cause a spark. The central exhaust fan I found was almost all plastic so I went with it. It exhausts to the outside which is a must and does the trick in my finishing room. I made a box that holds a filter to trap particles prior to hitting the fan mounted in between the ceiling joists. I think this fan was a little over $100.

-- Marty,, 866-444-6996

View Jim Jakosh's profile

Jim Jakosh

20475 posts in 3101 days

#12 posted 03-29-2014 06:10 PM

I would add that you have to take into account what it will be exhausting. If there might be dust in it, it would be best to go outside or be filtered before it is dumped inside. My 2 cents worth!!...Have a great weekend…Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View PASs's profile


595 posts in 3094 days

#13 posted 03-29-2014 06:31 PM

Code is certainly important, don’t want to blow yourself or the house up.
But if you’re outside the city and its a separate structure here’s a couple of thoughts.

Instead of sucking the fumes out with a bathroom exhaust fan (explosion proof blower required) consider PUSHING outside air into the space but with an exhaust port from the room to the exterior.
That would minimize the explosive vapor issue.
I’d make sure to turn the fan on before you start finishing to establish an air flow to keep any vapors from getting to the fan motor.
You could certainly use a bathroom vent fan in that case and I’ve seen some nice little axial flow fans at Northern Tools.
And I’m thinking dryer vents for the exhaust ports. You could put more than one in different locations (high and low). You can even put one from the blower on the INSIDE of the room to keep vapors away from the motor if its off.
And while I’m in creative mode a bathroom timer would let you set it and forget it for projects that you want to leave the fan on to try/cure.

-- Pete, "It isn't broken, you just aren't using it right."

View doubleDD's profile


7382 posts in 2039 days

#14 posted 03-29-2014 06:44 PM

Definitely exhaust to outside. Whether or not you have code issues or location isn’t a problem, exhausting in the attic is not a good idea.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View TopamaxSurvivor's profile (online now)


18268 posts in 3672 days

#15 posted 03-29-2014 07:08 PM

Sounds like a great project Roger. I agree with PASs, you do not wan to get in to the Long Yankee Green required to do explosion proof fans, ect. Push frash air in and let it exhaust through a few vents with back draft dampers.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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