Garage ventilation fan

4SPEED427 · A Poncho Legend!

Garage ventilation fan

crazytrain · Addicted!

depending on the size of your garage i don't think you will be able to pull much with a hole that small i think you would find it would take to long to clear the room especially with paint also i would mount the fan higher up as most fumes rise and if your hole is at the bottom you will be trying to pull the fumes from the top down to the bottom do you have a window in the the garage if so you could put a fan in your opening that is what i do if i am using spray bombs in my shop i just open the window and take out the screen and place the fan on the window ledge the fan i use is a portable floor fan so it is weighted on the bottom so it sits on the ledge without having to mount it when i am done i just remove the fan put screen back in and close the window i have a plastic exhaust fan that can put put into a wall or any opening it has flappers on the outside that open and close as the fan is on and off it plugs into the wall i don't use it anymore so you are more than welcome to have it but it is bigger than the hole you are planning if i remember it is about 12"x 12" i can send you a pic if your are interested

cdnpont · Canadian Poncho Superstar!

How tall are the roll up sections of the door? How about a removable duct and bracket in the door section, that the fan could be slid into? 13'' x 36' expanded hose. Pull it out or up to where it needs to be. Place exhaust tip hoses right in the blower hose when running the car.

I'm sure amazon or princess has a cheaper one.

https://www.vevor.ca/portable-utility-blower-c_10374/dust-fume-extractor-10inch-250mm-ventilation-fan-industrial-blower-10m-pvc-ducting-p_010521083986?gclid=CjwKCAiAxP2eBhBiEiwA5puhNcxa92sUpxzF87QqiE4JpNou5epQ2tZrBzzJ7qmL7v_pyvMhlUxKUBoCUMUQAvD_BwE

I've learned that one consideration to remember Carl, is the induction of flammable dusts/vapor's through the fan will require it to have an explosion proof rating. Whatever that is called. But it will come at an extra cost.

4SPEED427 · A Poncho Legend!

crazytrain wrote:
depending on the size of your garage i don't think you will be able to pull much with a hole that small i think you would find it would take to long to clear the room especially with paint also i would mount the fan higher up as most fumes rise and if your hole is at the bottom you will be trying to pull the fumes from the top down to the bottom do you have a window in the the garage if so you could put a fan in your opening that is what i do if i am using spray bombs in my shop i just open the window and take out the screen and place the fan on the window ledge the fan i use is a portable floor fan so it is weighted on the bottom so it sits on the ledge without having to mount it when i am done i just remove the fan put screen back in and close the window i have a plastic exhaust fan that can put put into a wall or any opening it has flappers on the outside that open and close as the fan is on and off it plugs into the wall i don't use it anymore so you are more than welcome to have it but it is bigger than the hole you are planning if i remember it is about 12"x 12" i can send you a pic if your are interested

I will send you a PM.

4SPEED427 · A Poncho Legend!

cdnpont wrote:
How tall are the roll up sections of the door? How about a removable duct and bracket in the door section, that the fan could be slid into? 13'' x 36' expanded hose. Pull it out or up to where it needs to be. Place exhaust tip hoses right in the blower hose when running the car.
I'm sure amazon or princess has a cheaper one.
https://www.vevor.ca/portable-utility-blower-c_10374/dust-fume-extractor-10inch-250mm-ventilation-fan-industrial-blower-10m-pvc-ducting-p_010521083986?gclid=CjwKCAiAxP2eBhBiEiwA5puhNcxa92sUpxzF87QqiE4JpNou5epQ2tZrBzzJ7qmL7v_pyvMhlUxKUBoCUMUQAvD_BwE

I've learned that one consideration to remember Carl, is the induction of flammable dusts/vapor's through the fan will require it to have an explosion proof rating. Whatever that is called. But it will come at an extra cost.

I've never seen one like that, interesting.

The door sections are 2' tall, so plenty of room.

2 years ago when I was breaking in a new engine on a test stand in that bay, I opened the door about a foot and blocked off the gap at the top that it leaves where it curls on the track into the garage the best I could. Because I couldn't make it seal real well, that worked good as my fresh air intake because at the bottom I had that foot gap sealed with plywood except for an opening wide enough for an old furnace fan. That worked really well but it was a lot of work setting it up and I want to have something quicker to set up, simpler, less heavy and bulky. Also when I built my 427 I painted it inside that bay in my drop cloth "paint booth" with the furnace fan setup. The snow on the ground outside was wonderfully orange when I finished the paint job!

LT1Caddy · Poncho Master!

Simplest method I've found is one of those "Box" fans with 3 speeds. You can buy them at Home depot, Walmart. About 18" square.

Cut the door and install a sliding door in it, out of plywood. To maximize the efficiency, the hole MUST be smaller by an inch or so than the fan. Then you can set the fan on the floor just back from the opening so the "cone" of air just touches the outside of the opening. This is the most efficient way to remove air from a building.
This tactic is used in fire fighting, called negative pressure ventilation. Works even better if you can open a window, about 55% smaller, on the opposite wall.

HTH

-- Edited by LT1Caddy on Sunday 5th of February 2023 11:18:56 AM

pontiax · Poncho Master!

I have a surplus fan, its a 4 fan that pushes 150 cfm. Its 120v. AC with 4 ft. cord.

we use them to ventilate apartment crawl spaces. It has rubber damper bushings so it can be mounted with out too much noise/ vibration.
i can bring it along to the coffee meeting.

-- Edited by pontiax on Sunday 5th of February 2023 12:29:57 PM

4SPEED427 · A Poncho Legend!

I like the look of it and the idea but is 150 cfm enough?

DonSSDD · Canadian Poncho Superstar!

He needs a big block Pete.

4SPEED427 · A Poncho Legend!

LOL and a 4 speed fan too!

pontiax · Poncho Master!

The blower that i have, has no label. But due to its sixe it would be between 150 and 300 cfm.

check out FASCO blower motors for different mounting option and cfm ratings.

4SPEED427 · A Poncho Legend!

pontiax wrote:
i can bring it along to the coffee meeting.

-- Edited by pontiax on Sunday 5th of February 2023 12:29:57 PM

Thanks for this offer. I think I have something lined up from a member here that has a bit more volume. I like this one because it's so compact but I want to make sure that was I get moves enough air to be effective.

If you feel like bringing this along to coffee I'd be curious to see it all the same though.

LeeRoy · Guru

Keep in mind when you exhaust an area you have to replace with a similar volume of air. If your garage is sealed up tight especially in cold weather the fan wont work as well. Kind of like sucking air out of a plastic bag. You may even end up sucking warm air from inside your house? Large buildings and schools have specific make up air units some with heaters to pre heat the replacement air. My friends Maserati has a feature where windows on both door open half an inch when the door is opened, otherwise the car is so air tight the doors wont close properly with the windows completely up. Sounds like you need to do smelly projects when the outside temp is + 20 or more and open both doors.

Big Bear · Addicted!

Been looking for fans mounted in industrial A/C evaporator housing. Remove evaporator, place it under garage door and fill the rest with a piece of plywood. Have seen on Kijiji but could'nt strike a deal. th?id=OIP.TRtFFWwuF3O3NSTu81ozkgHaFj&pid

Greaser · Canadian Poncho Superstar!

Princess Auto Flyer Jan.31 - Feb.12

10" https://www.princessauto.com/en/product/PA0008979965 824 CFM

14" https://www.princessauto.com/en/product/PA0008979973 1650 CFM

20" https://www.princessauto.com/en/product/PA0008979999 3360 CFM

cdnpont · Canadian Poncho Superstar!

Those look decent. I think a single 1650 CFM Princess auto fan mounted mid door would do the trick. Although that wouldn't cover your car exhaust venting.

60 DB sound rating too.

65 SD L79 · Canadian Poncho Superstar!

the first time i went to Florida i was blown away by repair shops having out door hoists. Fumes not a problem

Mike Ward MB · Addicted!

I installed a 16 exhaust fan high on the wall in the rear corner of my shop, opposite corner from the man door. When necessary I unlatch the door and turn on the fan. If I dont open the door first I almost suck in the overhead doors.

Much easier to install during construction but can be done with a little work after.

4SPEED427 · A Poncho Legend!

LeeRoy wrote:
Keep in mind when you exhaust an area you have to replace with a similar volume of air. If your garage is sealed up tight especially in cold weather the fan wont work as well. Kind of like sucking air out of a plastic bag. You may even end up sucking warm air from inside your house?

Yes, a quote from my original post-

"I would open the walk-in door from the garage into the house just a crack and if I had a powerful enough fan it should be able to pull warm house air through that cracked open door, through the garage and out the exhaust port."

4SPEED427 · A Poncho Legend!

Big Bear wrote:
Been looking for fans mounted in industrial A/C evaporator housing. Remove evaporator, place it under garage door and fill the rest with a piece of plywood.

The problem when when you do that is there's a big gap at the top then where the door curls in on the track. I tried that a couple of years ago with the furnace fan and plywood sealing the bottom. I opened the door a foot and it leaves a big triangular shaped opening at the top of the door. When I turned on the fan it evacuated really well but it pulled in so much cold air at the top opening it got cold in the work bay very quickly. That is why I want to cut a hole in the door, put a fan ducted to that hole, then pull warm air from the house through the garage and out the exhaust port.

Greaser · Canadian Poncho Superstar!

What Size Garage Exhaust Fan Does Your Garage Need?

https://www.coolmygarage.com/2021/02/23/what-size-garage-exhaust-fan-does-your-garage-need/

unruhjonny · Guru

if you're primary concern is exhaust fumes, why not do what older(?) shops would do?

They would have round cutouts near the bottom of the overhead door, and each of these cutouts have a rotating cover;
You would hook up a heavy rubber hose to the cars exhaust on one end, and the other end of the hose would be sticking out the garage door.

I did a quick google search, and these appear to be very similar to what my old job had:

LINK

Here is another link with more products:

LINK

unruhjonny · Guru

also, if the hose is relatively tight to the exhaust pipe, there is no need for a fan to direct air flow.

4SPEED427 · A Poncho Legend!

unruhjonny wrote:
if you're primary concern is exhaust fumes, why not do what older(?) shops would do?

They would have round cutouts near the bottom of the overhead door, and each of these cutouts have a rotating cover;
You would hook up a heavy rubber hose to the cars exhaust on one end, and the other end of the hose would be sticking out the garage door.

I did a quick google search, and these appear to be very similar to what my old job had:

LINK
Here is another link with more products:

LINK

Actually no, I have the rubber flex hoses for the exhaust. Right now when I use them I either roll up the overhead door a couple of inches and push them under the door, or I crack open the walk in door and run them out there. I'm more looking for actual ventilation for fumes like gear oil, paint, gasoline smell etc.

unruhjonny · Guru

oh.
I read that you didn't care for the 4" gap at the bottom of your door, and thought it was only about exhaust fumes.
I would install essentially a high powered bathroom fan, and have it vent out your gable (assuming you have one) - have the fan further from the house as to promote air flow AWAY from the house entry.