ᐅ Experience with centralized exhaust ventilation systems without heat recovery

I just wouldn’t want to willingly have unheated air blowing directly on my neck, for example through a gap in the window. However, of course, this is an inexpensive way to achieve forced ventilation.

He is looking for something affordable. Those who have been here for a while know him. He doesn’t have unlimited money.
I can tell zizzi that it’s fine as it is, you don’t get a stiff neck, and the extra 2.50 liters (0.7 gallons) of gas per month we save by choosing Pepsi instead of Coca-Cola balances it out. Karsten

Hello again and thank you for your information.

Mycraft schrieb:
The disadvantages were mentioned to you. This is not a ventilation system without heat recovery but an exhaust ventilation system. These are two different things.

A ventilation system is actually a general term for exhaust ventilation or supply and exhaust ventilation systems, with or without heat recovery, and there are plenty of sources where you can read about this.

What I have been offered is a controlled residential ventilation system from Wolf for a single-family bungalow, specifically for €11,500 (I don’t have detailed information).

Nordlys schrieb:
Exactly. Zizzi, we have the combination: Helios extraction fan, humidity-controlled, meaning it activates when the air is humid, otherwise it just exhausts quietly. The fan is in the bathroom. Fresh air comes in through adjustable window vents. Costs unknown, it was standard in the house. Works perfectly. Good air inside, bathroom dries quickly. Don’t care about energy-saving regulations or subsidies, simple, sturdy, reliable—that’s how it should be. Karsten

Nordlys, what you have built is exactly what I’m talking about: used and humid air is extracted from the bathroom or kitchen, and fresh, unheated air is supplied through valves in the walls or window frames of individual rooms. This is what is known as a central exhaust ventilation system.

Mycraft schrieb:
Central systems have central and controlled supply and exhaust air.

What you have, Nordlys, is an exhaust ventilation system with decentralized and probably uncontrolled air supply through the windows. So it’s neither one nor the other. But it basically has the characteristics of a decentralized system without heat recovery.

Central means that the air is extracted centrally, with either central or decentralized supply air. And I wouldn’t necessarily call the air supply through the windows “uncontrolled,” because exactly as much air comes in as is extracted, meaning the air exchange volume is regulated by the extraction fan.

Nordlys schrieb:
He’s looking for something affordable. Those of us here for a while know him. He’s not flush with cash.

I can tell zizzi it works well, no stiff neck, and the extra $2.50 gas cost a month we save by drinking Pepsi instead of Coca-Cola. Karsten

Exactly. Nordlys, do you have underfloor heating or radiators? I’m asking because if there are radiators in the house, the situation improves since the valves are installed over the radiators, so cold supply air is immediately mixed with warm air and draft issues are supposedly reduced. We will have underfloor heating.

Of course, you shouldn’t place the sofa directly under the outside air vent (OAV); better to plan this carefully beforehand.

Did you have a choice between different types of outside air vents? For example, window frame vents, vents through the roller shutter box, or vents in the wall. What are the differences?

zizzi schrieb:
Central means that air is extracted centrally, with a central or decentralized supply of fresh air.

Central is central, decentralized is decentralized, and everything in between are hybrid systems, which are neither fully central nor fully decentralized.

zizzi schrieb:
And I wouldn’t necessarily call that uncontrolled infiltration through the windows, because as much air comes in as is extracted; the amount of air exchange is basically regulated by the extraction fan.

Not at all, nothing is regulated. The fan runs for a period X and extracts a volume Y. Where this volume comes from does not matter to the fan. That’s why it is called unregulated.

Very little or no air may flow through the window(s) farthest away. So essentially, you only have a guaranteed exchange of air in the immediate vicinity of the exhaust vents.

The Nilan 300 Comfort has been installed by my construction company (with which I am building [emoji16]) for many years.

It provides heat recovery for the whole house. The cost is 5,000–7,000 euros including installation. That’s still reasonable?

After the third winter, if you rely on respiratory complaints because the humidity level does not rise above 30% (30%), you can certainly do that.