Our bathroom exhaust fan flops open and shut in hot weather, thats with the power off.

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A bathroom exhaust fan serves two purposes. One it eliminates odors in the bathroom and second greatly reduces the moisture in the bathroom

A bathroom exhaust fan serves two purposes. One it eliminates odors in the bathroom and second greatly reduces the moisture in the bathroom. By reducing moisture you will eliminate mold and mildew build up that causes the paint to peel off the walls and ceiling. You will also eliminate the bathroom door and cabinet doors from warping. So as you can see a bathroom exhaust fan can save you maintenance and repairs. Exhaust fans come in many different styles and models. You can get one that mounts on the wall or ceiling. Installing one will require some basic electrical work and making a cutout in the wall or ceiling.

Material and Tools :

Screwdriver set

Jig saw or Drywall hand saw

BX cable (shielded: 2-wire with ground wire)

Wire stripers

Lineman pliers

Wire nuts


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Some fans are triggered by a humidistat, if this is on one, it's possible the high humidity has closed the circuit. But a humidistat in a powder room isn't the most logical location for an installation.

You could try localizing the circuit that it's powered from by turning off the breakers in the main service panel one-by-one.

IF the fan turns off when power is removed from that bathroom, if you're comfortable, you could also remove the bathroom switch face plate and see if it's simply hot wired, or shorted.

This is a basic bathroom ventilation fan and not an air exchange fan or a heat recovery ventilator, etc? Again, a powder room would not be a logical location for ether of those. If you;re not certain, you could pull the grill off the fan and see if there is a manufacturer and model #.

Then there is also the phone call to the previous owner asking what the deal is with the...

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Bathroom Exhaust Fan TIPS

DEAR TIM: I have several inexpensive builder-grade exhaust fans in my home. They're noisy, and I don't feel they do a good job of getting rid of the moist air produced while showering.

Is it possible to get high-performance ventilation with little or no noise? I'd like a bathroom exhaust fan with a light. How about a fan that has a light and bluetooth speakers?

Can you tell me how to install a bathroom fan so I do not cause any damage to my home? Faith F., Mt. Crawford, VA

DEAR FAITH: Bathroom fans are a critical part of a home-ventilation system. A bathroom exhaust fan, improperly installed, can create all sorts of hidden damage to a home.

All too often, installers just let the moist air escape into an attic space. This moist air can condense on the cooler surfaces in the attic. This liquid water on the wood surfaces creates mold and can lead to serious wood rot.

CLICK HERE to get FREE & FAST BIDS from local...

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Older homes often lack bathroom exhaust fans. In the old days, if the bathroom was smelly or steamy, you were supposed to open a window to air it out.

This isn’t a very logical ventilation method, especially when temperatures are below zero, or when the weather is 90°F and humid. Yet this time-honored method of bathroom ventilation is still enshrined in our building codes. According to the 2009 International Residential Code (sections R303.3 and M1507.3), a bathroom with an operable window does not need to have a bath exhaust fan.

Why do we need exhaust fans?

In spite of the code’s archaic loophole, builders should install an exhaust fan in every bathroom or toilet room — even when the bathroom has a window.

A bath exhaust fan can perform several functions:

It can exhaust smelly air, allowing fresher air to enter the bathroom. It can exhaust humid air, allowing dryer air to enter the bathroom. When operated for 24 hours per day or when controlled by...
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They say nothing is certain but death and taxes, but I’d like to add a third: repairs! In one week alone, three things broke down on us that had to be repaired. When you’re a do-it-your-selfer and a blogger, you have to look on the bright side and call that a good week: repairs alone can give you a ton of things to write about!

For the Home Improvement contest, I’m sharing a DIY on how to replace a bathroom fan. 'Hidden' repairs are ones that go unnoticed, but they can be the most important DIYs you'll do because they protect the investment in your home - and your health. A well running (and installed) bath exhaust fan will help prevent mold growth which can trigger asthma and allergies. If you notice moisture stains on your walls or ceilings, metal corrosion, visible mold, peeling paint or wall paper, cloudy windows and high levels of humidity, it's time to change that fan. Other than the tight and awkward quarters you have to work in, it's a fairly straightforward repair -...

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By Todd Fratzel on Bathrooms, Product Reviews

DewStop™ – Condensation Sensing Fan Switch

The folks at DewStop™ sent us their FS-100 Fan Switch to review. In today’s tighter more energy efficient homes there’s a huge need for better ventilation and moisture control. We’ve written several articles on the causes of window condensation and the leading culprit is too much moisture in the house due to poor ventilation.

Make Your Fan A Smart Fan

There are lots of great bathroom fan timers on the market but none of them take it a step further like the DewStop™ Fan Switch. DewStop™ Fan Switch uses technology to monitor temperature, humidity and dew point, similar to what meteorologists use for weather prediction. This sensory software finds the room’s condensation level and prompts the fan to turn on or off.

DewStop™ Features

Fan turns off when condensation is no longer present on the wallsSaves energyLow maintenanceLong product lifeUse with your...
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Since yours vents into your attic space I would never use it either. Probably the biggest use of a bathroom vent fan is to help keep mold down in bathrooms, especially in humid areas. Lots of lawsuits against housing tracks have happened in humid areas where builders just put the cheapest fan in and a couple years later the residents find mold. Most bathrooms that are bigger than a closet have undersized fans and don't really do anything but make noise.

Building code changes will happen, if not all ready changed, that homes will have to have a certain air exchange per hour. This is because the modern homes are being built pretty much air tight, or about as close to it as you can get with doors, windows and other entry points for air to get in a house. Builders are starting to use bath fans for this, and a lot of them are being designed to be used 24/7, with very little noise.

Either way, do not pump moisture into attic...

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A problem with your bathroom exhaust fan can spell problems for that important room. Exhaust fans remove the extra moisture that can build up in your bathroom, which can cause mold, mildew and rust. If you’re seeing excessive wetness on the walls and the mirrors in your bathroom after a shower, there might be something wrong with your bathroom exhaust fan. Here are some troubleshooting tips you can try:

Turn on the exhaust fan and hold a thin piece of paper, such as toilet paper, over the grille. A working fan will grasp it tightly. If it doesn’t, there might be a blockage in the duct connecting to the exhaust fan. Remove the grille and try to find and clear the clog with a brush, preferably one that’s specifically for cleaning ducts. Remember, you can easily make holes in the duct, so don’t use anything with sharp parts to unclog your duct.

Once you’ve found the clog and cleared it, do the tissue test to ensure you’ve gotten all the clogs out. You can also go outside...

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so I cut a nice round hole in the ceiling of my bathroom. physically installed the fan.

was going to wire into the light so that the light switch would turn on the light and fan in one.

the exhaust fan has a plug- 2 prongs (i'm in australia).

the wiring to the light switch is only 2 wires.

the light wire was exposed /available half way between the light socket and the switch.

so thought that would be a good place to cut the wires (mains power off and fuses removed)

thought at first I would wire the fan in serial and that didn't work. tried parallel and htat didn't work.

I was going to wire a "power socket" on to the cable. the fan has a cable coming out of it with a plug .

inside the power socketty thing there places to out the wires. and then turn a screw to keep them in place (ooooohhhh , the technology talk is a flowing). so black has one socket thing to place wires in and red has 2 socket things to put wires in.


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Last week, our electrician installed a new bathroom exhaust fan in our green hall bath. During the install he made a shocking discovery — the old fan hadn’t worked properly since day-one. It was doing nothing. Zero. Zilch. Nada. Apparently this problem is somewhat common, so I made a video to help others learn about my bathroom fan problem and why it wouldn’t work.

Since beginning construction on my retro pink master bathroom, the hall bathroom has been seeing a lot more action. We’ve never had guests complain about the moisture issues in there, even though we knew they existed. But when we started using it full time ourselves, we realized just how bad it was. So when the electrician returned to finish working on the pink bathroom, I asked him to install a new fan in the green bathroom too.

In case you don’t have time to watch the video, here’s the gist of my bath fan woes:

Before we began work on the pink bath, both fans vented into the attic instead of...
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I am thinking that your contractor is not experienced or just lazy, IMHO in regards to this simple exhaust fan roof cap install. Please refer to the link below and click the installation instructions. You will see that there are 2 ways of venting these to the OUTSIDE. You do not run the duct just to the underside of an EXISTING ROOF VENT. That is not venting to the outside.

The NEW roof cap has a damper which is closed when the fan is not in operation but has a screen to prevent birds from entering.


Hope this helps!


Your concern about condensation forming inside the pipe is valid. It can and does happen to thousands of people because the installer failed to insulate the pipe. This is the most common mistake and overlooked issue on bathroom venting.

Even though the kits do not usually have insulated pipe doesn't mean that it is the right way. Insulation is best for...

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