Aereco EHT Vents

ROUSSEAU26

Hi,
Has anyone installed Aereco EHT Vents? They're humidity sensitive vents that react to moisture.
We've a difference of an opinion between builder and engineer, so I was hoping someone would be able to share their experience.
Thanks!

Calahonda52

Whats the row about?

ROUSSEAU26

Calahonda52 wrote: »

Whats the row about?

Whether they're any better than basic hole in the wall vent. Builder reckons the eht unit will get noisy after time and wind will cause them to rattle. Engineer recommending them as they only open when moisture detected. Old school vents, like where we currently live, let in drafts even if vent from is closed.

Calahonda52

Thanks so this is a new build where these are being proposed, perhaps a new house.
If this is the case then what is the designed ventilation strategy and how does it comply with Part F and L

http://www.environ.ie/housing/building-standards/tgd-part-d-materials-and-workmanship/technical-guidance-documents


The reason I ask is that, it seems, if the house is empty, with no humidity being created, there will be zero fresh air inflow?

ROUSSEAU26

Calahonda52 wrote: »

Thanks so this is a new build where these are being proposed, perhaps a new house.
If this is the case then what is the designed ventilation strategy and how does it comply with Part F and L


The reason I ask is that, it seems, if the house is empty, with no humidity being created, there will be zero fresh air inflow?

Yup, new build, natural air ventilation not HRV, ber assessor has given vents the thumbs up, just said to be careful what was purchased as some are very flimsy and may not pass inspection.

murphaph

Calahonda52 wrote: »

Thanks so this is a new build where these are being proposed, perhaps a new house.
If this is the case then what is the designed ventilation strategy and how does it comply with Part F and L

http://www.environ.ie/housing/building-standards/tgd-part-d-materials-and-workmanship/technical-guidance-documents


The reason I ask is that, it seems, if the house is empty, with no humidity being created, there will be zero fresh air inflow?

There's a trickle of air coming through them all the time. They just open wider when moisture is present. If the house (in fact room) is empty you don't need as many air changes as when it's occupied.That's the whole principle of operation of the DCV system. Using a hole in the wall totally voids any effort you've made at airtightness and conversely you need good airtightness for the DCV vents to work as intended.

OP: Are you installing an Aereco system?

Calahonda52

ROUSSEAU26 wrote: »

Yup, new build, natural air ventilation not HRV, ber assessor has given vents the thumbs up, just said to be careful what was purchased as some are very flimsy and may not pass inspection.

Ber man sounds like a cop-out

Tks Murph, I figured as much but I wanted to flesh it out with OP

murphaph

Calahonda52 wrote: »

Ber man sounds like a cop-out

Tks Murph, I figured as much but I wanted to flesh it out with OP

Agreed. It sounds like the op is going to fit these vents without creating the necessary vacuum in the house to draw air in through them. These vents are part of a system that needs a small vacuum in the house to work, otherwise air has no reason to pass through them in any useful quantity. In a modern air tight home relying on such a setup and not manually ventilating will surely lead to mould and plenty of it, especially in a new build with the high levels of moisture in the building materials.

BryanF

ROUSSEAU26 wrote: »

Hi,
Has anyone installed Aereco EHT Vents? They're humidity sensitive vents that react to moisture.
We've a difference of an opinion between builder and engineer, so I was hoping someone would be able to share their experience.
Thanks!

I have specified and installed them in a retrofit.

As others have said, wet rooms/wc/kitchen/utility need a central extract and then habitable rooms bedrooms/liv rm need intakes.

But

1. What is the air tightness target set in your contract?
2. Who is managing and installing the air-tightness layer?
3. Have you considered Mvhr? As this would be more appropriate for a new build.

fatty pang

murphaph wrote: »

Agreed. It sounds like the op is going to fit these vents without creating the necessary vacuum in the house to draw air in through them. These vents are part of a system that needs a small vacuum in the house to work, otherwise air has no reason to pass through them in any useful quantity. In a modern air tight home relying on such a setup and not manually ventilating will surely lead to mould and plenty of it, especially in a new build with the high levels of moisture in the building materials.

Indeed. Bolting one of these on to a window is also going to result in having to revert to Free Area volumes rather than Equivalent Area volumes when calculating background ventilation as I doubt many window manufactuers would have tetsted the airflow on the entire assembly.

ROUSSEAU26

BryanF wrote: »

I have specified and installed them in a retrofit.

As others have said, wet rooms/wc/kitchen/utility need a central extract and then habitable rooms bedrooms/liv rm need intakes.

But

1. What is the air tightness target set in your contract?
2. Who is managing and installing the air-tightness layer?
3. Have you considered Mvhr? As this would be more appropriate for a new build.

Sorry, alot of what has been spoken about has gone way over my head!
Trying to keep costs low. HR system is non runner.

BryanF

ROUSSEAU26 wrote: »

Sorry, alot of what has been spoken about has gone way over my head!
Trying to keep costs low. HR system is non runner.

Your engineer will advise so. Best of luck on your build.

lowkeys

I Have these in my house. It is a new build 4 years old and am happy with the system with no issues so far. If i was you i would talk to a rep from aereco or a similar company to get a specific design for your house as you will need a fan for kitchen, bathrooms and utility.

quickdraw2

I have contacted the distributors of this product rang as far back as 2012 and have had no success in doing business, I can only comment that their technical support can only be described as their sales prevention department. I am, and have been open to use Aereco products, and as I have already been using Heat Merchants for much of my HVAC supplies, I am dismayed as to how Aereco is even still in business,
If I was running this company I would fire all the sales staff, as to how they are even still in business, I'm effin amazed.