Bathroom fan installer - Suggestions please

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samgdan

160 posts

Master Geek

#272446 25-Jun-2020 12:34

Hi everyone,

I planning to hire someone to install a fan extractor in the bathroom. it started to smell like humidity and leaving the windows open helped but not 100%.

The challenge is that installing the fan on the ceiling will move the air into the Attic and that is not an option, so I need someone who can run some ducting and make a hole into the roof (iron steel). I aware that making a hole there can bring potential leaking issues however it needs to be done.

for that reason I looking for recommendations of someone/companies who knows how to do what I need and also do a good job (I really dont want to deal with leaks in the future)

I'm locate in Christchurch.

Thanks in advance for the help 😀

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20578 posts

Uber Geek

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#2512107 25-Jun-2020 12:52

A few thoughts:

Don't get one of those tiny fans from the hardware store, get a decent extractor fan. I've used Simx Mixed flow fans and Fantech Provent.
If you have decent eaves you can push the air out there. You could also consider a wall fan, but they're fairly low power.
You will probably need both a builder and an electrician if you want to cut a hole in the iron

Bung

6479 posts

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Subscriber

#2512108 25-Jun-2020 12:57

Does it have to go through the roof? Is there an overhanging soffit close that could take the exit vent. Depending on diameter roof vents may need to be flashed back to the ridge making it expensive.

cruxis

481 posts

Ultimate Geek

#2512110 25-Jun-2020 12:59

Doing the exact same thing here in chch, I booked the job in with foleys during school holidays in 2 weeks. I have also asked if the sparky if he can install a clock timer on the line so it also turns on and off to use my free hour of power.

https://www.foleys.co.nz/locations/christchurch/

blackjack17

1705 posts

Uber Geek

#2512118 25-Jun-2020 13:05

The right hand side is more common.

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Dugimodo

168 posts

Master Geek

#2512123 25-Jun-2020 13:09

A local sparky did mine, including cutting the hole in the ceiling and the roof and installing the vent up on the roof.

I can't remember the firm, but I'm not in christchurch anyway.

A little surprising to me at the time, but it's plumbers who often deal with tin roofs.

samgdan

160 posts

Master Geek

#2512124 25-Jun-2020 13:10

Bung: Does it have to go through the roof? Is there an overhanging soffit close that could take the exit vent. Depending on diameter roof vents may need to be flashed back to the ridge making it expensive.

sadly no overhanging soffit. similar to the photo below is my case, I cant see any other option than a hole in the roof.

Suggestions to avoid making the hole?

samgdan

160 posts

Master Geek

#2512127 25-Jun-2020 13:11

Dugimodo:

A local sparky did mine, including cutting the hole in the ceiling and the roof and installing the vent up on the roof.

I can't remember the firm, but I'm not in christchurch anyway.

A little surprising to me at the time, but it's plumbers who often deal with tin roofs.

do you remember what was the cost of that work? any leak issues?

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samgdan

160 posts

Master Geek

#2512129 25-Jun-2020 13:12

timmmay:

A few thoughts:

Don't get one of those tiny fans from the hardware store, get a decent extractor fan. I've used Simx Mixed flow fans and Fantech Provent.
If you have decent eaves you can push the air out there. You could also consider a wall fan, but they're fairly low power.
You will probably need both a builder and an electrician if you want to cut a hole in the iron

thanks for the suggestion, i will keep them in mind.

samgdan

160 posts

Master Geek

#2512130 25-Jun-2020 13:13

blackjack17:

The right hand side is more common.

ok, but i dont think is possible in my case, left side sadly is my case I think.

timmmay

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#2512131 25-Jun-2020 13:13

cruxis:

Doing the exact same thing here in chch, I booked the job in with foleys during school holidays in 2 weeks. I have also asked if the sparky if he can install a clock timer on the line so it also turns on and off to use my free hour of power.

https://www.foleys.co.nz/locations/christchurch/

Instead of that sort of timer, get it put on a standard plug then use the Kasa Wifi controller timer.

These use bugger all power and don't run for long though, so probably better to have a switch on the wall so you can use as required.

concordnz

472 posts

Ultimate Geek

Trusted

EMT (R)

#2512165 25-Jun-2020 14:07

Get them to wire fan into your light switch & on a delay off timer. (Whenever the light is on the fan is running)
This is increasingly common & recommended practice in some areas.

Think of it like a Turbo Vehicle - which continuez to run on a delay even after you have turned the key off, locked it, & walked away.....

Try and get the 'fan' situated at the 'exit' rather directly attached to the ceiling - this will reduce 'fan noise'.
(& use insulated ducting - to further reduce 'fan noise')

afe66

3181 posts

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#2512166 25-Jun-2020 14:07

Our main bathroom fan above the shower vents directly into the roof space, but we only use the bath so not an issue.

Even if it was legal at the time, it feels to me to be a particularly stupid thing to be allowed to do.

In the deep south you can guarantee the roof space will be cold compared with the shower stall nearly all year round, which surely means the moisture will precipitate on the wood beam holding the roof up...

samgdan

160 posts

Master Geek

#2512245 25-Jun-2020 15:00

concordnz: Get them to wire fan into your light switch & on a delay off timer. (Whenever the light is on the fan is running)
This is increasingly common & recommended practice in some areas.

Think of it like a Turbo Vehicle - which continuez to run on a delay even after you have turned the key off, locked it, & walked away.....

Try and get the 'fan' situated at the 'exit' rather directly attached to the ceiling - this will reduce 'fan noise'.
(& use insulated ducting - to further reduce 'fan noise')

I have the same idea in my mind, I just need to find someone who can do it. i hope someone call suggest people who are good doing this type of work. I really dont want any leak issues in the future.

samgdan

160 posts

Master Geek

#2512247 25-Jun-2020 15:02

afe66:

Our main bathroom fan above the shower vents directly into the roof space, but we only use the bath so not an issue.

Even if it was legal at the time, it feels to me to be a particularly stupid thing to be allowed to do.

In the deep south you can guarantee the roof space will be cold compared with the shower stall nearly all year round, which surely means the moisture will precipitate on the wood beam holding the roof up...

that is what I trying to avoid, to put the vents into the roof space.

concordnz

472 posts

Ultimate Geek

Trusted

EMT (R)

#2512252 25-Jun-2020 15:09

samgdan:
afe66:

Our main bathroom fan above the shower vents directly into the roof space, but we only use the bath so not an issue.

Even if it was legal at the time, it feels to me to be a particularly stupid thing to be allowed to do.

In the deep south you can guarantee the roof space will be cold compared with the shower stall nearly all year round, which surely means the moisture will precipitate on the wood beam holding the roof up...

that is what I trying to avoid, to put the vents into the roof space.

That's a 'non-issue' engineering wise'
If you have ever been up in a tin roof during winter rain storm (or up in a concrete tile roof - you would know the breeze howls through & the ambient air is easily as damp as the air outside.)

The saving grace for roof spaces - is that they DO have this huge Air transfer & the beams/air drys out as the ambient air improves outside.

Your bathroom adds very little moisture & is quickly blown away.

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