Continuous ventilation fans
Discussion
B17NNS said:
So top left then.
No, more like bottom left, but without the centralised unit.dMEV works on the same principle as whole house MEV, but decentralised (ie. individual fans for each room, rather than ducting to a single centralised unit).
If it is dMEV, then the answers to the OP's questions are:
- yes, or you'll almost certainly run into moisture control problems (if the system is dMEV, the extract rates won't be anything like powerful enough to control it if run intermittently), and;
- no, not much.
I’ve installed Vent Axia Svara fans which run continuously and then spool up when they detect a change in conditions (eg light coming on or humidity going up). Can adjust all the settings via Bluetooth eg speed, and can be configured to run in silent mode only during certain times of day.
Very happy with them overall and can hardly hear them - certainly not outside the room. Only challenge is they are a little bit spendy.
Very happy with them overall and can hardly hear them - certainly not outside the room. Only challenge is they are a little bit spendy.
I work for a ventilation manufacturer, whose name has already come up in a previous post.
it sounds like you have a decentralised MEV system. The fans need to run continuously for the system to work. You should also have trickle vents in the habitable rooms. You need to make sure these are open as well.
In terms of moving the technology on. The fans you have are most likely axial type. They are fine providing the duct runs aren’t too long. Moving to a centrifugal type fan would be quieter and cope more easily with higher pressure duct runs.
Let me know if you need further help.
it sounds like you have a decentralised MEV system. The fans need to run continuously for the system to work. You should also have trickle vents in the habitable rooms. You need to make sure these are open as well.
In terms of moving the technology on. The fans you have are most likely axial type. They are fine providing the duct runs aren’t too long. Moving to a centrifugal type fan would be quieter and cope more easily with higher pressure duct runs.
Let me know if you need further help.
Edited by robemcdonald on Monday 30th July 21:07
robemcdonald said:
I work for a ventilation manufacturer, whose name has already come up in a previous post.
it sounds like you have a decentralised MEV system. The fans need to run continuously for the system to work. You should also have trickle vents in the habitable rooms. You need to make sure these are open as well.
In terms of moving the technology on. The fans you have are most likely axial type. They are fine providing the duct runs aren’t too long. Moving to a centrifugal type fan would be quieter and cope more easily with higher pressure duct runs.
Let me know if you need further help.
If your company resides in Wales....it sounds like you have a decentralised MEV system. The fans need to run continuously for the system to work. You should also have trickle vents in the habitable rooms. You need to make sure these are open as well.
In terms of moving the technology on. The fans you have are most likely axial type. They are fine providing the duct runs aren’t too long. Moving to a centrifugal type fan would be quieter and cope more easily with higher pressure duct runs.
Let me know if you need further help.
Edited by robemcdonald on Monday 30th July 21:07
Tell your company they do a brilliant piv system, even better when paired with the humidity sensor.
Also ask if the heater elements can be retro fitted to a non heat eco HC.
Ta
rs4al said:
Thanks guys for the replies, will probably upgrade the fans once settled in.
Axial flow vs centrifugal, bit like superchargers and jet engines.
I’ve got similar in my house. I leave them off, unless I’m showering or boiling something for a while in the kitchen. They are pretty rattly. No problems with condensation at all.Axial flow vs centrifugal, bit like superchargers and jet engines.
Edited by rs4al on Monday 30th July 21:29
My parents house (late 80's self-build) has a MHRV system, aka, bottom right picture.
Bloody awesome thing, pair of centrifugal fans and a heat exchanger in a box in the attic, and ducting to each room to either remove stale air (bathrooms, shower rooms, kitchen) or blow in fresh preheated air (bedrooms and living rooms).
Cant hear it running standing by the vents, or directly under it on the hall, at normal running speed. Yet you never have to open a window (no trickle vents) and washing dries overnight. No mould, nothing.
Obviously a sod to retro-fit the duct work to a whole house, but we retro fitted the same to my grand parents bunglow in a weekend so doing the first floor would be easy and a good start.
Seriously considering it on our new house (edwardian semi) just for the feel of the house. Nether house are likely air tight enough to demand it, but it saves having issues with towels not drying and mould behind wardrobes.
Dont know what the running costs are but the fans are only just ticking over. After almost 30 years they bearings starting sounding a little grumbly but the manufacture still exists and where able to provide a replacement pair which only needed mild modifications to cowling mounts to fit like for like.
Unit is a 'Villavent' .
Daniel
Bloody awesome thing, pair of centrifugal fans and a heat exchanger in a box in the attic, and ducting to each room to either remove stale air (bathrooms, shower rooms, kitchen) or blow in fresh preheated air (bedrooms and living rooms).
Cant hear it running standing by the vents, or directly under it on the hall, at normal running speed. Yet you never have to open a window (no trickle vents) and washing dries overnight. No mould, nothing.
Obviously a sod to retro-fit the duct work to a whole house, but we retro fitted the same to my grand parents bunglow in a weekend so doing the first floor would be easy and a good start.
Seriously considering it on our new house (edwardian semi) just for the feel of the house. Nether house are likely air tight enough to demand it, but it saves having issues with towels not drying and mould behind wardrobes.
Dont know what the running costs are but the fans are only just ticking over. After almost 30 years they bearings starting sounding a little grumbly but the manufacture still exists and where able to provide a replacement pair which only needed mild modifications to cowling mounts to fit like for like.
Unit is a 'Villavent' .
Daniel
30 years old, must have been one of the first MVHRs.
The most modern ones are even better, run even more quietly and have heat exchangers that are up to 90% efficient.
The reduction in heating bills more than pay the fan running costs.
Virtually all new apartments being built now have one.
The most modern ones are even better, run even more quietly and have heat exchangers that are up to 90% efficient.
The reduction in heating bills more than pay the fan running costs.
Virtually all new apartments being built now have one.
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