ᐅ Connecting a Range Hood: Efficient and Quiet Venting to the Air Duct

Hello, I would like someone knowledgeable to explain to me exactly how and with which pipes I should connect my range hood to the air duct (vent stack). The goal is maximum efficiency and as low noise as possible. The apartment is located in a multi-family building. The range hood is installed inside a cabinet (with a free height of about 50 cm (20 inches) above the hood, cabinet width 60 cm (24 inches)). The hood is located right next to the air duct. As far as I know, the air duct is made of concrete hollow blocks.

From what I have understood, the optimal solution would be a rigid PVC pipe with a diameter of 150 mm (6 inches) and 45-degree elbows. However, I believe I cannot fit two of these elbows inside the cabinet. If I install only one 90-degree elbow, the space inside the cabinet would be sufficient, but I have read that such an elbow reduces efficiency and increases noise levels.

Use a flexible duct. The airflow noise is negligible compared to the noise of the hood itself, regardless of which ducts you use.

geraldo85 schrieb:

The apartment is located in a multi-family building.

But first, please check with the homeowners’ association—if it is a condominium. Also, it might be worth verifying whether the chimney is suitable for this purpose.

Make sure to definitively confirm whether the chimney shaft is suitable. Is there an exhaust opening available for connection? And what is its diameter? Installing a range hood on a chimney shaft is rather unusual.

kbt09 schrieb:

Definitely clarify whether the chimney flue is suitable. Is there an outlet hole for connection? And what is its diameter? A kitchen hood connected to a chimney flue is rather unusual.

Yes, that is exactly what it is intended for – to connect a kitchen hood. There is no hole at the moment – I will drill it.

geraldo85 schrieb:

Air vent shaft (flue)

May I ask what you mean by air vent shaft? Is a flue connected to it? You mentioned something about an apartment.
Who owns the shaft, whatever its purpose is.
I exclude that possibility for you for now.

Well, this definitely needs to be clarified with the owner or the homeowners’ association. Chimney shafts are really not designed for that purpose.