ᐅ Fewer operable windows with mechanical ventilation with heat recovery

Created on: 7 Jan 2020 08:05
S
Smarti99
Hello,

Would you partially forgo openable windows in a new build with controlled residential ventilation? More fixed panes or only casement windows instead of tilt windows?
Manual ventilation is no longer desired then.
Vicky Pedia7 Jan 2020 12:25
Bookstar schrieb:

A controlled residential ventilation system does not replace airing out,
The savings from fixed glazing are minimal compared to the total house price. And imagine if something catches fire...
B
Bookstar
7 Jan 2020 13:05
Vicky Pedia schrieb:

The savings from fixed glazing are small compared to the overall house price. And just imagine if something catches fire...

Did I write unclearly? Even with mechanical ventilation with heat recovery, people will still want to ventilate manually for many reasons:

Cooking odors
Overheating from the sun in winter
Smells from new furniture glue
House parties
Forgetting to take out the trash

None of these can be fully handled by mechanical ventilation alone; opening the windows for 5 minutes helps.

I’m also a fan of mechanical ventilation with heat recovery, but it definitely has its limits...
Vicky Pedia7 Jan 2020 13:09
@Bookstar: I meant nothing else.
Dr Hix7 Jan 2020 13:21
Vicky Pedia schrieb:

The savings from fixed glazing are small compared to the total house price

That probably applies to most "details" when viewed separately from the rest.

However, I find it quite significant. After all, you not only save on the sashes but also on the entire RC-related components. You can save around 1000€ or more per unit. The larger window area and the nicer view are additional benefits.
rick201828 Jan 2020 22:22
We will have a lot of fixed glazing. However, this does not affect safety issues. Fixed glazing is just somewhat less expensive.

Nevertheless, we have enough and large openings for manual ventilation.

Our mechanical ventilation with heat recovery (MVHR) system is very generously sized and also designed for active cooling, so the examples mentioned by Bookstar could be quickly managed by the MVHR system.

Even a standard-sized MVHR system exchanges the air faster than manual ventilation.

Openable elements are often desired for psychological reasons as well.

Our guest room will not have an openable window. My wife was completely against it, even though one entire wall is fully glazed.

A good tip is to consider ease of cleaning. If access is difficult, it’s better to install an openable element.
N
nordbayer
28 Jan 2020 22:25
rick2018 schrieb:

Even a standard mechanical ventilation system exchanges air faster than natural ventilation.
You don’t really believe that nonsense yourself, do you? I can achieve an air exchange rate of 0.3 in less than 5 minutes by opening all the windows wide.