Want to make this fan run backwards

[Shaun @ Tru6]

Any idea on which wires I switch? No pun intended.

I want to make it a sucking fan vs. a blowing fan.

[Jolly Amaranto]

Some AC motors are difficult to reverse. If the fan is on a pole stand, the blades are bent to be efficient rotating in only one direction. If possible, just rotated the whole fan housing 180°.

[stomachmonkey]

Just turn it around?

[cashflyer]

[KFC911]

Originally Posted by stomachmonkey

Just turn it around?

How come you get the easy ones ?

[Hugh R]

You'll have to turn it around, a fan running backwards doesn't pull air due to the shape of the blades.

[GH85Carrera]

Originally Posted by Hugh R

You'll have to turn it around, a fan running backwards doesn't pull air due to the shape of the blades.

This. It will mostly make noise.

[Hugh R]

Originally Posted by peteremsley

mount the blade backwards?

That would probably work.

[Shaun @ Tru6]

I made a dedicated painting room for Cerakote. Has a big sliding window that I put the fan in to blow out. As a 6100 CFM fan, I thought it would do a decent job for an 8x10 room but it just doesn't pull enough air.

Doing a little research I found that exhaust fans run anti-clockwise to regular fans so thought it was worth a try.

I'm also wondering if 3 feet of open window above the fan also contributes to it not working as well as I need. Door open/closed has no effect.

[Scott Douglas]

Your open window is killing it.

Make sure the only place it can draw air from is the room itself.

[BK911]

6100 cfm?
3 phase?

[Shaun @ Tru6]

Originally Posted by Scott Douglas

Your open window is killing it.

Make sure the only place it can draw air from is the room itself.

Agreed. I flipped the fan blades and it didn't do much using a paper towel as a draw indicator.

Will get some lauan and see what that does.

[Shaun @ Tru6]

Originally Posted by BK911

6100 cfm?
3 phase?

20 in. High-Velocity Floor Fan-SFC1-500B - The Home Depot

It blows very strong. Just hasn't sucked yet.

[flipper35]

If it blows strong it is moving air. You just have to make it so the air it moves comes from the right place and goes to the right place instead of reverting around the window.

[pete3799]

I can't make up my mind whether this thread blows or sucks.

[Gogar]

Yep no air escaping around the fan. That's why a box shape fan is a little easier if you're not doing something permanent.

Also try to make the opening for the air entering the room smaller than the diameter of the fan (assuming you are able to plug up the rest of the window). It'll get a higher velocity through the room.

[Shaun @ Tru6]

I put the fan blade back on correctly and cobbled this together quickly, fan mounted in Al angle and cardboard taped on.

Doing some door handles and backs of Torque Thrusts tomorrow, looking forward to seeking how it works.

[Hugh R]

Cerakote seems to have an active ingredient (the carrier solvent) called parachlorobenzotrifluoride (70%+ of the mixture) , which has a lower explosive limit (LEL of 0.9%) and an upper explosive limit of 10.5% in air. This was just a quick search, but you may want to consider an explosion-proof rated fan. Also supplied air seems to be recommended, not respirators.

https://thechemco.com/chemical/parachlorobenzotrifluoride-pcbtf/

[javadog]

^^^ This is why Hugh gets paid the big bucks.

Your description of what you're doing isn't very clear, I assume you have an air intake into the room as well, correct? If not, then that's your problem.

[john70t]

What Hugh said also. yowsa.

annnd...if you are using that room as a spray booth, don't you want to do a Dexter Morgan and cover all the walls with plastic so the LL doesn't take a chunk of your security deposit? I say this after spending three days painting a place, when it should have taken only one. There was a lot of staining and wax candle buildup in the paint.