Bath fan and moisture
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Bath fan and moisture (by BillW [NJ]) Apr 8, 2019 7:10 AM
       Bath fan and moisture (by S i d [MO]) Apr 8, 2019 7:27 AM
       Bath fan and moisture (by S i d [MO]) Apr 8, 2019 7:28 AM
       Bath fan and moisture (by RathdrumGal [ID]) Apr 8, 2019 7:30 AM
       Bath fan and moisture (by Roy [AL]) Apr 8, 2019 7:38 AM
       Bath fan and moisture (by JB [OR]) Apr 8, 2019 7:49 AM
       Bath fan and moisture (by Lynn [MA]) Apr 8, 2019 7:59 AM
       Bath fan and moisture (by BillW [NJ]) Apr 8, 2019 8:37 AM
       Bath fan and moisture (by plenty [MO]) Apr 8, 2019 9:02 AM
       Bath fan and moisture (by AllyM [NJ]) Apr 8, 2019 9:04 AM
       Bath fan and moisture (by gevans [SC]) Apr 8, 2019 9:08 AM
       Bath fan and moisture (by BillW [NJ]) Apr 8, 2019 10:13 AM
       Bath fan and moisture (by DJ [VA]) Apr 8, 2019 10:23 AM
       Bath fan and moisture (by Busy [WI]) Apr 8, 2019 10:34 AM
       Bath fan and moisture (by BillW [NJ]) Apr 8, 2019 10:36 AM
       Bath fan and moisture (by BillW [NJ]) Apr 8, 2019 10:51 AM
       Bath fan and moisture (by myob [GA]) Apr 8, 2019 11:14 AM
       Bath fan and moisture (by Landlord ofthe Flies [TX]) Apr 8, 2019 11:17 AM
       Bath fan and moisture (by BillW [NJ]) Apr 8, 2019 11:28 AM
       Bath fan and moisture (by myob [GA]) Apr 8, 2019 12:18 PM
       Bath fan and moisture (by plenty [MO]) Apr 8, 2019 12:35 PM
       Bath fan and moisture (by Busy [WI]) Apr 8, 2019 1:24 PM
       Bath fan and moisture (by Robert,OntarioCanada [ON]) Apr 8, 2019 3:22 PM
       Bath fan and moisture (by BillW [NJ]) Apr 8, 2019 3:33 PM
       Bath fan and moisture (by J [FL]) Apr 8, 2019 3:37 PM
       Bath fan and moisture (by Dan [NY]) Apr 8, 2019 4:37 PM
       Bath fan and moisture (by Hoosier [IN]) Apr 8, 2019 6:33 PM
       Bath fan and moisture (by gevans [SC]) Apr 9, 2019 3:22 AM
       Bath fan and moisture (by nhsailmaker [NH]) Apr 9, 2019 3:42 AM
       Bath fan and moisture (by BillW [NJ]) Apr 9, 2019 9:20 AM
       Bath fan and moisture (by Hoosier [IN]) Apr 10, 2019 10:48 AM
       Bath fan and moisture (by Gene [OH]) Apr 10, 2019 7:01 PM
       Bath fan and moisture (by BillW [NJ]) Apr 11, 2019 7:15 AM
       Bath fan and moisture (by J [FL]) Apr 11, 2019 12:18 PM

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Bath fan and moisture (by BillW [NJ]) Posted on: Apr 8, 2019 7:10 AM
Message:

Whatís the best way to reduce moisture in bathrooms (from showering), and stop mold/mildew from forming?

Having the exhaust fan on the same switch as the light, seems good, but after a long hot shower, as soon as the tenant leaves the bath, and shuts off the light, the fan would go off too. To fix that, Iím thinking of going with either a timer in the light switch, to keep the light and the fan on after someone leaves the bathroom or replace the fan with a moisture sensing one.

Any thought on reducing bathroom moisture from showering? Any ideas on fans, moisture sensors, switches, timers, etc. to reduce moisture?

BTW, I rent to groups of students, so itís not reasonable to expect them to set a timer when their done taking a shower, for example. And the bathrooms Iím working on now, are 40 square feet (8 foot ceilings), and Iím thinking of replacing the 50 CFM fans with 80 or 100 CFM fans. Thank you!!

--100.1.xxx.xxx




Bath fan and moisture (by S i d [MO]) Posted on: Apr 8, 2019 7:27 AM
Message:

We hard wire them to the light switch. Will they turn it off? Yes, but they can also fail to use timers or turn them off.

If you know of a light switch that has a timer built into it that automatically runs for 30 minutes...that's okay I guess, but I think you'll get some people upset that your fan is sucking the heat out of the bathroom in the dead of Winter every time they go in to pee or brush teeth. --173.20.xxx.xxx




Bath fan and moisture (by S i d [MO]) Posted on: Apr 8, 2019 7:28 AM
Message:

Btw, most folks that I know leave the bath room door open when it's not in use, so even if they turn the fan off after a shower the steam should escape rapidly. --173.20.xxx.xxx




Bath fan and moisture (by RathdrumGal [ID]) Posted on: Apr 8, 2019 7:30 AM
Message:

I hate the sounds of bath fans. I never run the bath fans. My parents never ran their bath fans. I lived for 30 years in Seattle (high humidity). I have never had mold or mildew in my bathrooms, even in windowless bathrooms.

I do like fresh air and will open windows on a sunny day.

There is more to reducing mold/mildew than bath fans. We always hang up our damp towels after using them, and never leave them sitting on the bathroom floor. --98.146.xxx.xxx




Bath fan and moisture (by Roy [AL]) Posted on: Apr 8, 2019 7:38 AM
Message:

Central Heat/Air systems are probably the best thing I know that removes humidity from any room. --68.63.xxx.xxx




Bath fan and moisture (by JB [OR]) Posted on: Apr 8, 2019 7:49 AM
Message:

I install the built in timer-switches and tell them to make sure they run fan for 15-20 minutes longer than their showers. --24.20.xxx.xxx




Bath fan and moisture (by Lynn [MA]) Posted on: Apr 8, 2019 7:59 AM
Message:

I had some insulation work done by the city and they installed bathroom fans and replace the switch with a normal looking switch that will keep the fan running for a certain amount of time even after they turn it off. --38.142.xxx.xxx




Bath fan and moisture (by BillW [NJ]) Posted on: Apr 8, 2019 8:37 AM
Message:

Thanks S i d, thatís a great point: no one will be happy, in the winter, to dump 20 minutes of heated air outside, after brushing their teeth. Makes me think a settable timer, for both the light and the fan (theyíre on same switch) would be the way to go. Iíd put a placard by the switch saying: ďplease set timer for 20 min after showering. Thanks.Ē Iíd guess 80% of my student tenants would do it. Iím thinking the ďLutron maestro 600-Watt Light/3 Amp Fan TimerĒ might do the trick.

RathdrumGal, I agree thereís options other than fans to reduce moisture, but my student tenants, who are wonderful, on average, have other things on their minds, and I need a solution that doesnít require much effort on their part.

Roy, Iíve got baseboard heat in the bathroom, but one of the problems is, on this floor, I have one shower servicing 5 bedrooms, that could have up to 9 students living there.

JB, what you described, a built-in timer-switch, is pretty much what Iím thinking. Iím thinking though, a little ďinstruction placardĒ next to the switch would be nice.

--100.1.xxx.xxx




Bath fan and moisture (by plenty [MO]) Posted on: Apr 8, 2019 9:02 AM
Message:

They make new fans the won't turn off until the moister is removed... upgrade the fan! --173.127.xxx.xxx




Bath fan and moisture (by AllyM [NJ]) Posted on: Apr 8, 2019 9:04 AM
Message:

There is an actual bathroom paint that does not mildew. YOu can find it at the hardware store. I can't remember the name of it right now but if I remember this post I will look at it when I go to the hardware store and I go every day. It just does not mildew. Your fan should be enough and others have explained why you don't want to suck the heat out in winter. --173.61.xxx.xx




Bath fan and moisture (by gevans [SC]) Posted on: Apr 8, 2019 9:08 AM
Message:

Moisture detecting fan switch. And if you want it to be upscale, get the remote mounted fan, it's super quiet. fan mounts in the attic in the middle of the exhaust duct. --173.233.xxx.xx




Bath fan and moisture (by BillW [NJ]) Posted on: Apr 8, 2019 10:13 AM
Message:

Plenty and gevans, either solution sounds good, but one problem is, the room fan and light are on one switch. I looked at the Q & A of the "Decora In-Wall Humidity Sensor & Fan Control", and it does not recommend controlling a fan and a light with this humidity sensing switch. As for the, humidity sensing fan, I'm thinking I'd also run into the same problem, with the fan and light on a single switch. At this point, it seems like the timer switch, controlling the room light and fan, is the way to go.

AllyM, thanks for the reminder on the bathroom paint!! --100.1.xxx.xxx




Bath fan and moisture (by DJ [VA]) Posted on: Apr 8, 2019 10:23 AM
Message:

If you like the humidity sensing fan, why not separate them into two separate switches?

--68.10.xxx.x




Bath fan and moisture (by Busy [WI]) Posted on: Apr 8, 2019 10:34 AM
Message:

Another partial solution is to trim the door on the bottom a bit more. That lets a bit more air circulate.

I have had Panosonic bath vent fans added to a couple of houses. Very quiet. Still am seeing some mold issues in one house where the shower curtain never gets washed. And the tenant pulls the thing closed as soon as they step out of the shower. I wish I could convince my tenants to never ever use those vinyl curtain liners, underneath decorative curtains. Just the simple solid color fabric curtain that doesnít need a liner , is so easy to just toss in the wash, donít even have to take the plastic curtain rings off. --70.92.xxx.xxx




Bath fan and moisture (by BillW [NJ]) Posted on: Apr 8, 2019 10:36 AM
Message:

DJ, I guess I could add a switch, but it seems like that would be a fair amount of electrical and sheetrock repair, to run another switch and accommodate the larger housing for the sensor equipped fan. Interesting thought though. Maybe I should talk with my electrician to get an idea of the work required to do the 2nd switch, and the bigger fan. Thanks for the thought! --100.1.xxx.xxx




Bath fan and moisture (by BillW [NJ]) Posted on: Apr 8, 2019 10:51 AM
Message:

Busy, checking the bottom door gap is a great idea! I just googled, and saw at .01" wc (inches wc (water column) is a measure of air pressure) a 1" gap on a 30" door allows 60 CFM, so if my door gap is 1/2", I could be restricting the airflow. I'm going to look at that. And interesting comments on the shower curtains. Thanks!! --100.1.xxx.xxx




Bath fan and moisture (by myob [GA]) Posted on: Apr 8, 2019 11:14 AM
Message:

You can't fix stupid!!!!!!!!!! --99.103.xxx.xxx




Bath fan and moisture (by Landlord ofthe Flies [TX]) Posted on: Apr 8, 2019 11:17 AM
Message:

I'm sure this will cause more trouble than it's worth regarding noise and smell, but what about putting vent holes in the top and bottom of the bathroom door covered by vents so that when the bathroom fan is on, it sucks in air from the rest of the home into that room and would create greater flow. Also, when the main house AC is running, it would pull air from the bathroom if the door was shut. You could install a larger AC register and duct in the bathroom to up the pressure in that room forcing the humid air out into the house. Maybe install a return outside the bathroom door to help the flow. That way, both bathroom fan and HVAC system would help dissipate the humidity.

This is a theory, but I welcome experts to comment on the validity of my theory.

--108.69.xxx.xxx




Bath fan and moisture (by BillW [NJ]) Posted on: Apr 8, 2019 11:28 AM
Message:

Landlord ofthe Flies, I don't have central ac at the house in question. However, I think what you described, about adding vent holes to the door, is valid, and is addressed in Busy's suggestion of: "trim the door on the bottom a bit more. That lets a bit more air circulate." I'm going over to the house now, to measure the door gaps. If the gaps are less than 1", from the bottom of the door, to the threshold, then I will shorten the doors to increase the gap to 1" or so. While I'm at the house, I'm also going to check the fan operation with the "toilet paper fan test". Thank you! --100.1.xxx.xxx




Bath fan and moisture (by myob [GA]) Posted on: Apr 8, 2019 12:18 PM
Message:

I recently installed 2 vents in a water heater room that was getting moisture on the walls and mold. They were 4 inch circular and I put one toward the bottom and one at top -- made of pvc. Seems to have help stop the mold.

Maybe 3 or 4 across the lower part of the bath door. --99.103.xxx.xxx




Bath fan and moisture (by plenty [MO]) Posted on: Apr 8, 2019 12:35 PM
Message:

Should not cause damage to add second switch. Easy for electrician. If trimming the door solves then that was easy! Nice to exchange ideas here! --99.203.xx.xxx




Bath fan and moisture (by Busy [WI]) Posted on: Apr 8, 2019 1:24 PM
Message:

I like your scientific method of measuring to gap at the bottom of the door. We use the hound measurement. If our houndsí toes can poke under the door, thatís enough air flow. Heehee! --172.58.xxx.xxx




Bath fan and moisture (by Robert,OntarioCanada [ON]) Posted on: Apr 8, 2019 3:22 PM
Message:

Install a humidity type of switch that turns on exhaust fan when humidity is high. Change out the shower head to low flow. Installing a exhaust fan which has higher air output will reduce humidity in shorter time. --147.194.xxx.xx




Bath fan and moisture (by BillW [NJ]) Posted on: Apr 8, 2019 3:33 PM
Message:

Well, there was no hound at the house :-), so I used a tape measure, and found the space between the door and the floor is 1/4 to 3/4" so I'll shorten the door to give a 1" gap. For the 30" door, I figure that will add 15 sq*in of ventilation. For comparison, two 4" vents gives, 25 sq*in

As for the toilet paper test, the fan did hold a piece against itself, but I guess I didn't learn much more than the fan is spinning the right direction.

I'm going to sleep on it. I meet the electrician tomorrow morning. Thank you all!! --100.1.xxx.xxx




Bath fan and moisture (by J [FL]) Posted on: Apr 8, 2019 3:37 PM
Message:

I have a similar situation. No fan in bathroom. Had someone come there and he said an exhaust could not be installed in that bathroom.

The only mold I've gotten so far has been in the shower. So after the first tenant messed it up I had it regrouted and now I'm using a grout sealer at each turn over. And charging them if they leave it a mess.

--72.188.xxx.xxx




Bath fan and moisture (by Dan [NY]) Posted on: Apr 8, 2019 4:37 PM
Message:

Iíve installed some fans with humidity switch built in and others with the fan wired to a separate humidity switch. The humidity switch allows the fan to be turned off and on manually to override sensor, if needed. The fans with built in sensor can be hard wired with no tenant ability to shut off. --68.192.xxx.xxx




Bath fan and moisture (by Hoosier [IN]) Posted on: Apr 8, 2019 6:33 PM
Message:

Bath fans are sold with an SCFM rating. If you buy the cheap fan, you get one that does not move much air. Get a high SCFM fan and then use the proper hose/exit cap. --99.92.xxx.xxx




Bath fan and moisture (by gevans [SC]) Posted on: Apr 9, 2019 3:22 AM
Message:

Moisture activated fan does not require a switch!

Electrician can wire it to the closest junction box in the attic. --173.233.xxx.xx




Bath fan and moisture (by nhsailmaker [NH]) Posted on: Apr 9, 2019 3:42 AM
Message:

Panasonic Wisper fit 100 makes a low scone (quiet) 100+ CFM fan with built in timer to keep fan running for set time after . Make sure to get the one with the light

the timer setting is actually done after a whole house energy audit is done to determine the necessary 3.14 air changes an hour

with that many kids you definitely NEED it

Federal Weatherization standards REQUIRE it.

I believe in NJ you can get your local electric company to do the whole house energy audit and get a massive subsidy -50%- to pay for it all

- yes - that includes installing the fan --24.62.xxx.xxx




Bath fan and moisture (by BillW [NJ]) Posted on: Apr 9, 2019 9:20 AM
Message:

This morning my electrician installed a 70 CFM fan, replacing a 50 CFM one. My handyman will shorten the door for 1Ē from door to threshold. This was spurred by Busy and myobís suggesting to increase the area for venting.

Yesterday, I planned to install timers for the fans, but last night I realized, because my fan and light are on a single switch, a timer could make the room dark, if someone accidently set the timer to 10 minutes, before they took their 15-minute shower.

I think connecting the fan and lights to a single switch, as I have, is a good, buy not quite a guaranteed way to make sure the fan is on when someone is taking a shower. I didnít see any easy way to add moisture sensing to that arrangement.

Well, thank you all for taking the time to share your thoughts. I think I may be implementing some of the more sophisticated moisture removal techniques suggested, in my largest house, which will be rented to 15 students (legal limit and my personal record :-) this year. Thanks again!!

--100.1.xxx.xxx




Bath fan and moisture (by Hoosier [IN]) Posted on: Apr 10, 2019 10:48 AM
Message:

15 students? OMG...no chance for parties there. --99.92.xxx.xxx




Bath fan and moisture (by Gene [OH]) Posted on: Apr 10, 2019 7:01 PM
Message:

I am using the DewStop condensation bathroom fan switch. You can set the moisture level and the time for the timer portion. Works very well. Here is the link to the switch at Home Depot.

homedepot.com/p/DewStop-Condensation-Fan-Switch-with-Countdown-Timer-in-White-120-Volt-50-60Hz-HS-C00-W7/206424892 --99.165.xx.xxx




Bath fan and moisture (by BillW [NJ]) Posted on: Apr 11, 2019 7:15 AM
Message:

Hoosier, I think because my houses are not in the "party central" area, I don't draw that type of crowd. However, If there is a giant party, and the police are called, and I'm woken at 3am, I'll let you know :-)

Thanks Gene. The condensation switch looks good, but in the situation of having the lights and fan on one switch, It doesn't seem to work out. That being said, I realize I could be wrong about that, and maybe there is a way to make it happen. Thanks again. Bill --100.1.xxx.xxx




Bath fan and moisture (by J [FL]) Posted on: Apr 11, 2019 12:18 PM
Message:

The Panasonic fan that NHSail mentioned is very good. I installed one in my own house and it solved the moisture problem in my bathroom. --72.188.xxx.xxx



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