Condensing extractor fan

[nicebutdim]

I think I'd need to fit door grills to upstairs bedrooms to help with movement. Nice link Mike be I don't speak French

I find poor joinery work helps as air moves freely through gaps under doors.

 

[Mike Johnson]

I think I'd need to fit door grills to upstairs bedrooms to help with movement. Nice link Mike be I don't speak French

Go to Google settings and you can set it to always translate French.

PV at only a single point will not be very effective at distributing air around a whole dwelling.

The French have legislated this for new builds, this link will explain fully: https://www.leroymerlin.fr/comment-choisir/comment-choisir-sa-vmc.html

 

[nicebutdim]

PV at only a single point will not be very effective at distributing air around a whole dwelling.

*PIV

Those stand alone units are mostly intended for use in homes with up to 5 bedrooms, with some being intended for 3 story properties. I'm no expert on the subject of PIV, but people I've met to who have installed units in their own homes speak very highly of them. As with anything there will be people whose experiences are less than satisfactory, but I've not yet met one.

Given that the principle is increased air pressure in the home, I'd contend that it should be very effective indeed - provided the property doesn't have huge air gaps. In a modern 'hermetically sealed' property, their effect is reported to be noticible immediately.

The people I've spoken to (those who knew what had been installed) all have Nuaire Drymaster units and I've not heard any first hand reports about the Vent Axia units previously linked.

 

[Mike Johnson]

I have 'silent' humidistat fans in bathrooms and have been pleased with their effectiveness, but have been thinking of adding a PIV unit as I like the idea of forced air to all rooms.

Don't you think the Humidistat fans, presumably as extracts, will be fighting any PIV you install?

The links I have provided above are for extracting stale/moist/air from rooms, not pressurising, different systems.

 

[nicebutdim]

Don't you think the Humidistat fans, presumably as extracts, will be fighting any PIV you install?

The links I have provided above are for extracting stale/moist/air from rooms, not pressurising, different systems.

That's a question I've wondered about. Heated PIV is intended to eliminate moisture, so it may be that they work fine with it. If they turned out to be an issue, then local isolation would simply be switched off.

My French is basic, but it appears to me that the system you linked is multi room extraction with humidistats, which does the same job as the fans I have - albeit from a central extraction unit.

 

[Mike Johnson]

That's a question I've wondered about. Heated PIV is intended to eliminate moisture, so it may be that they work fine with it. If they turned out to be an issue, then local isolation would simply be switched off.

My French is basic, but it appears to me that the system you linked is multi room extraction with humidistats, which does the same job as the fans I have - albeit from a central extraction unit.

Introducing Hot air that holds more moisture?

The OP's original question was for a condensing extract, although I don't think a condensing extract is available the nearest you can get is an extractor or system with a Humidistat control, condensation collected can be piped to any convenient drain even back into the toilet cistern at a push.

To translate the site I linked Google settings has a translation app built in go too settings and tick the "always translate French" tab.

 

[nicebutdim]

Introducing Hot air that holds more moisture?

The OP's original question was for a condensing extract, although I don't think a condensing extract is available the nearest you can get is an extractor or system with a Humidistat control, condensation collected can be piped to any convenient drain even back into the toilet cistern at a push.

To translate the site I linked Google settings has a translation app built in go too settings and tick the "always translate French" tab.

PIV doesn't introduce hot air. 'Heated' units simply take the chill off air being introduced from outside during periods of cold weather. You could learn this by reading from the link previously posted by another member.

Original issue posted by OP can be easily resolved as per the council's suggestion of venting an extractor through the roof. I don't envisage the council in question being willing to pay for multi-room extraction, in order to provide bathroom extraction.

Reading the linked page in English is not possible as Leroy Merlin want to block me for some reason. Firefox is exceptionally easy to set up automatic translation on, but in order to do so one needs to be able to access the page in question. From what I can ascertain your link contains two versions of this product: The first a simple multi-room extraction system, which vents externally and doesn't collect condensate and the second appears to be a heat recovery system, which I think was suggested early in the thread and would be much cheaper to install as a stand alone unit for bathroom only as opposed to full house. The downside of the systems you have linked is the requirement for one or more points of external ventilation, which brings us back to the OP's original issue - not wanting to go through the roof. Unless I've missed something, none of these systems can be installed without external ventilation.

 

[Mike Johnson]

Very basic Physics, heated air holds more moisture, no matter where it comes from or how it is introduced.

The condescending remark in your post above is below the standard I expect from you.

 

[nicebutdim]

Very basic Physics, heated air holds more moisture, no matter where it comes from or how it is introduced.

The condescending remark in your post above is below the standard I expect from you.

You've lost me, Mike. Nowhere in my last post is the word 'condensing' even used, but we're no longer addressing the OP's question, so I'll bow out of this and not ask for further explanation.

 

[Froggie]

Their suggestion was a vertical vent through the roof.

I've used this product lapVent roof space ventilation system - product overview - https://lapvent.co.uk/overview.html with insulated ducting a couple of times where it hasn't been possible to core externally. They appear to work very well and are quicker and significantly less messy than coring.

 

[mhar]

I have installed a few PIV systems. They are more whole house solutions than single room solutions and they are suprisingly effective. Both nu-aire and vent-axia, to me the only difference appears to be price.

I have only put in one whole house heat recovery and ventilation system, it gives the occupants dry throats and because they have ufh they don't even have a radiator or heater that they can put a bowl of water on to add a bit of humidity!

Going back to the original question, there is something that does the job, a dehumidifier. However people will have views about placing one in a bathroom