ᐅ Dimplex Controlled Residential Ventilation Distance Between Exhaust and Supply Air Outlets / Outdoor Air Intakes

Hello everyone

I would like to get your opinion regarding the placement of the outdoor air intake and exhaust outlets for our planned central controlled residential ventilation system.
Dimplex recommends maintaining a minimum distance of 2.5m (8 feet) between the two vents to avoid air short-circuiting. Alternatively, there is a double-wall grille option where the connections are close together, but the special grille directs the air downwards in different directions.

Our planned distance between the two vents is about 60cm (2 feet). I asked our contractor about this, and he said it might be fine either to use the double grille that blows air in different directions even though it is closer together, or to use two single vents with some space between them.

Are there any specialists among you who are familiar with this topic?

Best regards
nick205

Manufacturers don’t provide guidelines just for the sake of it. 2 meters (6.6 feet) has always been a rough rule of thumb. However, if the manufacturer specifies 2.5 meters (8.2 feet), it is best to follow that.

Mycraft schrieb:

Manufacturers don’t provide guidelines just because they feel like it. 2 meters (6.6 feet) has always been a rough rule of thumb. But if the manufacturer specifies 2.5 meters (8.2 feet), you should definitely follow that.

Yes, I agree. What surprises me, though, is that manufacturers often offer this double-wall grille, which blows air in different directions.
I’m not an air flow specialist, but I can’t imagine that such a double-wall grille prevents air mixing just because it blows in multiple directions.

What kind of assessment do you need there? Make a clear statement that he must follow the manufacturer's specifications, and that's it. Or do you want to breathe your own air?

Can't you work around the corner?

tomtom79 schrieb:

What kind of assessment do you need? Just make it clear that he has to follow the manufacturer's guidelines, end of story, or do you want to breathe your own air?

Can't you work around the corner?

Thank you very much for your feedback.
Unfortunately, working around the corner is not possible because the outlets are in the garage, and the space conditions there do not allow it.

nick205 schrieb:

I’m not an airflow specialist, but I can’t imagine that a double-wall grille prevents air mixing just because it blows air in different directions.

Take a look at the Vallox grille. It basically blows air in the same direction and is located right next to the intake opening. Still, there is no short-circuiting.

So either use grilles specifically designed for this purpose or build according to the manufacturer’s instructions.