Typically, it is recommended that you run your bathroom extractor fan while you use the bathroom and for about 10 to 15 minutes after. However, it depends on how the room has been used and for how long. For example, if you take a steamy bath or a long shower, you will want to run the bathroom for longer than usual. As far as odours are concerned, simply run the bathroom fan until the smell has been removed.
To avoid electrical issues, which we will discuss later on, you should never leave your bathroom fan on overnight. About an hour should be the maximum time you let an extractor fan run.
When it comes to extractor fans in the kitchen, you should typically run them while you are using the hob and for another 10 to 30 minutes after you are done cooking, depending on what you made. You may want to operate it for longer if you make fish or other pungent-smelling foods. The run time will also vary somewhat based on how much smoke and steam are produced while cooking. Different bathroom extractor fans are turned on and off in different ways.
The most common, basic model of a bathroom fan is connected to the light switch, so it automatically turns on and off with the light. Other bathroom extractor fans have their own switch with a timer that can be adjusted. Some of the most modern extraction fans do not have a switch at all and, instead, have a humidity sensor. The sensor monitors the air in the space and automatically turns on and off the power when a particular level of humidity is reached.
I was here for 2 days before I realized why there is a switch in this bathroom for both fan and extractor. There are two types of fans on the ceiling! As you use your fan, lint, dust, dirt, and hair are naturally sucked into the fan and build-up on the blades and around the wiring. This build-up of debris can overheat and combust, leading to an accidental fire. A build-up of dust and hair can also limit the functionality of the fan by clogging the blades. In addition, faulty wiring can also lead to a fire.
Should the fan be on only after showering? We installed a timer which has been amazing but DH thinks I leave it on to long and I don't think he has it on enough. If the fan is sized correctly it should move enough air to cause a complete air exchange in the entire room 4 times an hour every 15 minutes.
For best performance it should run long enough to effect one additional air exchange after you leave the bathroom which means it should have a 15 minute delay on break timer, which means the fan will continue to run for 15 minutes after the switch is turned off.
How long that takes is going to depend on the size of your room, the power of the fan, and anything that might obstruct air exchange. If you run it while showering, you'll keep much of the steam from building up in the first place. From a water management perspective, that is a good thing. If you prefer a steamy shower though, it would be a drawback. How big should I make my master bath? Should I put in lighted ceiling fans or just ceiling fans in the bedro.
What long-running decorating trends have run their course? I normally like a nice, hot steamy shower, except after exercising, so I normally don't run the fan during the shower. We have our fan on a timer, so I set it for 30 minutes after my shower. Seems to be enough time to clear the room of steam.
On average, in our household 4 showers are taken per day. The fan timers are set for 30 minutes 10 minute shower time plus an additional 20 minutes run time. That's a lot of conditioned heated or cooled air pumped out the roof vents. If you have a 2, sq ft home with 8 foot ceilings, half the air in your house is pumped out daily. This last weekend while cleaning the shower, I noticed the first signs of mildew on the caulk above the tub.
It wasn't there a couple weeks before and in my mind that is about when DH changed his fan routine. I'm sure the fan in the bathroom isn't as large as it should be just because nothing seems to have been done right in this house.
Which is why I'd rather run it longer than shorter. Search All. Search Preferences:. Click here to recover your password. How long should a bath fan run after a shower is used? Was this helpful?
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This ensures that the proper amount of ventilation has occurred. Any easy solution is to install a fan timer switch. Switches can operated based on the humidity level in the home, on movements or simply be set on a timer. There are many considerations for CFM, but we are going to stay with the basics for a typical homeowner.
The general rule is 1 CFM per square foot of space with standard 8 foot ceilings. So if you have an 8 foot x 10 foot bathroom you would need at least an 80 CFM fan. This would be the minimum ventilation. Depending on your usage, you might consider a slightly larger fan to make sure you have enough power to clear the room. The second consideration is sound — sones.
A rating at or below 1 sone will be very quiet.
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