The air you’re pushing out needs to be replaced somehow. If there’s only one window open, then the only place for air to come in is through that same window, and it won’t work too well. But, if you have two windows open on opposite sides of the room, then that would work very well. If there is a second window open anywhere in the house, the air will be pulled through the house from that window.
But, also simply stirring it around will dilute it, and make it less noticeable.
The concept described here is what us homebuilders call “make up air.” In a tight envelope, when you need to exhaust air, you have to forcibly introduce fresh air to make up the difference. Otherwise your envelope (home) will sit in a vacuum and air won’t move anywhere.
Usually, there is only one window in a bathroom. If you have a fan, turn it on and open the window and it should disappate quickly. If you only have the window and no fan, punch a hole through the drywall to the next room, preferably close to the baseboard for optimal airflow. I assume you are at your “special friend’s house” and trying to hook up. Wait a few minutes and it should clear. Hope this helps!
Best if the fan has two blades moving in different directions.
Air exchange will work with a fan blowing in or out only. Leave the louvers around the fan closed, close the room door and air has to escape through the window around the fan.
so that air can flow in and out of different sides of the same window, instead of having to have two windows, one with air flowing in and the other with air flowing out
Any room that was so airtight this would be a concern has already taken that into account. Air will get in under the door, through cracks or fixtures, or even the window the fan is in.
The air you’re pushing out needs to be replaced somehow. If there’s only one window open, then the only place for air to come in is through that same window, and it won’t work too well. But, if you have two windows open on opposite sides of the room, then that would work very well. If there is a second window open anywhere in the house, the air will be pulled through the house from that window.
But, also simply stirring it around will dilute it, and make it less noticeable.
The concept described here is what us homebuilders call “make up air.” In a tight envelope, when you need to exhaust air, you have to forcibly introduce fresh air to make up the difference. Otherwise your envelope (home) will sit in a vacuum and air won’t move anywhere.
Usually, there is only one window in a bathroom. If you have a fan, turn it on and open the window and it should disappate quickly. If you only have the window and no fan, punch a hole through the drywall to the next room, preferably close to the baseboard for optimal airflow. I assume you are at your “special friend’s house” and trying to hook up. Wait a few minutes and it should clear. Hope this helps!
A window fan changes this a little.
Best if the fan has two blades moving in different directions.
Air exchange will work with a fan blowing in or out only. Leave the louvers around the fan closed, close the room door and air has to escape through the window around the fan.
My room gets very chilly by morning doing this.
Edit: for those you haven’t seen a window fan https://noai.duckduckgo.com/?q=window+fan&rpl=1&ia=images&iax=images
Trying to iimagine a fan with blades in different directions…
Window fans have two sets of fan blades side by side. They can spin in opposite directions.
Why?
so that air can flow in and out of different sides of the same window, instead of having to have two windows, one with air flowing in and the other with air flowing out
Oh, so it’s effectively two independent fans. I misunderstood before.
I too was imagining an overlaid set of counter-rotating blades
Any room that was so airtight this would be a concern has already taken that into account. Air will get in under the door, through cracks or fixtures, or even the window the fan is in.