Ceiling Fan Direction- Which way is best?

Re: Ceiling Fan Direction- Which way is best?

PostBy: wsherrick On: Mon Jan 28, 2013 7:53 pm

coalnewbie wrote:Tried it both ways with many readings with my IR gun over my Jotul and it made no difference. In normal mode you are taking the hot air and moving it towards the floor and the negative pressure will move the cold are up there. However, I suppose you should go with conventional wisdom which is like the moral majority.


It should work either way.
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Re: Ceiling Fan Direction- Which way is best?

PostBy: oliver power On: Mon Jan 28, 2013 8:54 pm

I'm not sure which way is better. We've tried both ways. We've decided to run our fans on low, pushing down for heat circulation. Something to think about: You can push air easyer/further than pulling it. Same with water. In fact, you want the cold air going down. Another theory: If a ceiling fan were pushing down in the middle of the ceiling, wouldn't that push air to the outside walls. At that point, cold air would drop, and warm air would rise along the outside walls, creating a warm air film (which has an R-value), up the exterior walls. Notice some commercial buildings have hot air blowing at the entrance. Never have I seen cold air blowing at the entrance. In other words, if the ceiling fan was in reverse, you wouldn't want cold air washing the exterior walls. My vote is for pushing down. Oliver
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Re: Ceiling Fan Direction- Which way is best?

PostBy: vmi1983 On: Mon Jan 28, 2013 9:05 pm

mozz wrote:Exactly. If the air touches your skin, it will make you feel cooler. Wind chill effect. Most fans come with a owners manual and will describe it.

coalkirk wrote:It's all personal preference. Some people don't like to feel air blowing on them so run the fan so it's pulling air up. That washes the walls with the warm air going down.



I agree.... the fan is set on low gently sweeping the heat outwards towards the walls and doorways. Atop the Vigilant II, two ECOFANS
push the heat forward which is captured by natural convection and swept up somewhat by the ceiling fan. I assume the heat is moving
properly across the ceiling and I feel no air movment on my skin.

Here's a link regarding ceiling fan direction:

http://www.youtube.com/watch?v=7oD7eV7A3-E
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Re: Ceiling Fan Direction- Which way is best?

PostBy: mozz On: Mon Jan 28, 2013 9:16 pm

"Something to think about: You can push air easyer/further than pulling it. Same with water."

Depends on the blades doing the work. The force required to accelerate an object of a given mass by a given amount will always be constant (F=ma). Pulling water uphill is easier than pushing it also.
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Re: Ceiling Fan Direction- Which way is best?

PostBy: VigIIPeaBurner On: Mon Jan 28, 2013 9:43 pm

Sometimes ceiling fans actually create a curtain of air that blocks the natural heat circulation through the house. I cannot remember the name of the thread but there was a discussion on the forum last year where someone had that problem. The way his rooms were set up no matter which way he ran the fan, the airflow would block the heat from moving throughout the house.

So yes . . . what he said :lol:
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Re: Ceiling Fan Direction- Which way is best?

PostBy: vmi1983 On: Mon Jan 28, 2013 10:05 pm

VigIIPeaBurner wrote:Sometimes ceiling fans actually create a curtain of air that blocks the natural heat circulation through the house. I cannot remember the name of the thread but there was a discussion on the forum last year where someone had that problem. The way his rooms were set up no matter which way he ran the fan, the airflow would block the heat from moving throughout the house.

So yes . . . what he said :lol:


Oh Brother! Now I have no clue if I am on foot or horseback! I'm twisting in the wind here!!
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Re: Ceiling Fan Direction- Which way is best?

PostBy: Rigar On: Mon Jan 28, 2013 10:08 pm

vmi1983 wrote:
VigIIPeaBurner wrote:Sometimes ceiling fans actually create a curtain of air that blocks the natural heat circulation through the house. I cannot remember the name of the thread but there was a discussion on the forum last year where someone had that problem. The way his rooms were set up no matter which way he ran the fan, the airflow would block the heat from moving throughout the house.

So yes . . . what he said :lol:


Oh Brother! Now I have no clue if I am on foot or horseback! I'm twisting in the wind here!!


... if you're twisting in the wind... your fan is way too big
... put it on low speed
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Re: Ceiling Fan Direction- Which way is best?

PostBy: Rigar On: Mon Jan 28, 2013 10:31 pm

Vmi1983...

...just turn it on and see what happens...just dont gett dizzy watchin it :D

..enjoy the warm breeze...up OR down ! :up:
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Re: Ceiling Fan Direction- Which way is best?

PostBy: vmi1983 On: Mon Jan 28, 2013 10:40 pm

Rigar wrote:Vmi1983...

...just turn it on and see what happens...just dont gett dizzy watchin it :D

..enjoy the warm breeze...up OR down ! :up:


You're right take time to smell the roses!!! LOL! :pepsi: :pepsi:
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Re: Ceiling Fan Direction- Which way is best?

PostBy: oliver power On: Mon Jan 28, 2013 10:42 pm

mozz wrote:"Something to think about: You can push air easyer/further than pulling it. Same with water."

Depends on the blades doing the work. The force required to accelerate an object of a given mass by a given amount will always be constant (F=ma). Pulling water uphill is easier than pushing it also.
Not quite sure what your saying here. For conversation sake, here it goes; If pulling water up hill is easyer than pushing it, why is a shallow well pump limited for draw/depth. A deep well jet pump, as well as a submersable pump, and all other pumps, including a shallow well pump, pushes a long long ways. You said the magic word "Force" (push), not pull. All in fun here...... Oliver EDIT: We are getting a little off topic here. Should be talking ceiling fan direction.
Last edited by oliver power on Mon Jan 28, 2013 10:49 pm, edited 2 times in total.
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Re: Ceiling Fan Direction- Which way is best?

PostBy: lobsterman On: Mon Jan 28, 2013 10:44 pm

VigIIPeaBurner wrote:Sometimes ceiling fans actually create a curtain of air that blocks the natural heat circulation through the house. I cannot remember the name of the thread but there was a discussion on the forum last year where someone had that problem. The way his rooms were set up no matter which way he ran the fan, the airflow would block the heat from moving throughout the house.

So yes . . . what he said :lol:


yep, for the same reason curtains can increase heat loss. It is always best to blow cold to the stove. Floor fans are better at this. The thing to do is turn all fans off and measure the path of the natural convection in your layout, using candles, incense, or strips of paper taped to the doorways. Once established, don't fight this direction of flow, use fans to increase that flow. It does not take much.
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Re: Ceiling Fan Direction- Which way is best?

PostBy: japar On: Mon Jan 28, 2013 10:58 pm

In my living room of my raised ranch where my stove is I never use the ceiling fan. I do use the dual window fan that sits down the hallway in the bedroom doorway at the bottom blowing out towards the living room usually set on low. While sitting down at the computer I can feel the warm air coming in.
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Re: Ceiling Fan Direction- Which way is best?

PostBy: Body Hammer On: Tue Jan 29, 2013 9:24 am

Makes no difference. If it's 90 at the ceiling and 60 at the floor; then running the fan in either direction will mix it up and even out the room. I prefer pulling the air up. Doesn't seem to be as much draft felt while siiting in the room.
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Re: Ceiling Fan Direction- Which way is best?

PostBy: Chuck_Steak On: Tue Jan 29, 2013 4:38 pm

mozz wrote:... Pulling water uphill is easier than pushing it also.


That's really not true.
You can only pull water up around 34'. That is it.
At 34 feet the pressure at the bottom of the pipe/column/vessel/whatever,
is equal to 1 atmosphere. You just cannot go past that with a conventional pump.
No matter how big it is.
That is why the pumps are at the bottom of a deep well, pushing,
and why they can work in a shallow well... pulling.

Dan

(Edit: Sorry, Oliver, to drift from the original topic...)
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Re: Ceiling Fan Direction- Which way is best?

PostBy: wilder11354 On: Tue Jan 29, 2013 9:21 pm

i have HW baseboards outer walls, run fan with it blowing air downward center of room. Cause's floor air to move towards walls, and push up through baseboards. Thats how they are designed to work anyway. hot air up, looses heat cooler air returns back down and recircultes for reheat.
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