ᐅ Connecting a Range Hood: Efficient and Quiet Venting to the Air Duct
Created on: 6 Dec 2025 18:21
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geraldo85
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.
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.
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geraldo856 Dec 2025 22:54Arauki11 schrieb:
You don’t want honest opinions, just pats on the back..Of course, I am here to read a variety of opinions and comments. So far, only one person has written about this topic. All other comments make no sense at all. They refer to a completely different subject.
The question is actually quite simple: At what angle should the pipes run to the chimney?
geraldo85 schrieb:
This is a column that extends from the first to the top floor. It is built from concrete blocks and is intended to accommodate a kitchen extractor hood.Never!Ugh... I'll try again and please respond only to this question:
What is the reason not to ask the homeowner or property management if it is clearly planned this way? They can probably also answer your question about the angle, since it will be the same at least in one or another apartment. Why don’t you want to ask them?
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geraldo856 Dec 2025 23:30Arauki11 schrieb:
Never!
Ugh... I’ll try again and please answer only this question:
What’s stopping you from asking the homeowner or property management if it’s clearly intended that way? They could surely also answer your question about the angle, since it must be the same in at least one of the apartments. Why don’t you ask them? Oh my God… where did you get the idea that I doubt whether the chimney is designed for this? And what does that have to do with my question about the angle of the pipes in my house? The property management obviously has no knowledge about airflow resistance and PVC pipes for a kitchen extractor hood. It makes no sense to ask them, just as pointless as asking about the size of the TV.
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nordanney6 Dec 2025 23:41geraldo85 schrieb:
The optimal solution would be a rigid PVC pipe with a diameter of 150 mm (6 inches) and 45-degree bends. However, I don’t think I can fit two such bends into the cabinet. If I only install one 90-degree bend, there is enough space in the cabinet, but I have read that such a bend reduces efficiency and increases noise levels.How about switching to a rectangular duct with flow-optimized bends? That way, the 90-degree bends would be more efficient than in round ducts, and maybe two 45-degree bends would fit as well.Apart from that, I would also point out that such a “chase” for range hoods is unusual. How many floors does the building have, how many apartments per floor could be connected, and on which floor do you live? Also, how do you plan to prevent air from other hoods from flowing back into your unit?
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geraldo856 Dec 2025 23:45Arauki11 schrieb:
So, no questions allowed............tsk tsk. The homeowner has no clue, but an amateur forum does. Makes sense..
Never allowed – at any angle, I’m out. So far, a total of 22 replies, but only one on topic. Is that what you mean by amateur forum? I thought I would meet people here who know about airflow and how to best install my ducts. Maybe you’re right and the mistake was on my part.
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