Hello, I'm going to install a ventilation system in the house and they want to run the pipes down to the basement through the chimney. But as you can see in the pictures, the pipe that was attached to the oil boiler must go down. What is the easiest way to proceed?

Metal pipe attached to ceiling with green valve, surrounded by various plumbing and wiring in a basement setting.

Old heating pipe in a basement ceiling, surrounded by other pipes and insulation, related to a ventilation system installation query.
 
I pulled mine straight up out of the chimney and cut it in half so I wouldn't have to get it on my head on the way down from the roof...

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Yes, but now my pipe is not exactly undersized, so it weighs a lot. I think I need to take it down and cut it into 1.5m lengths. Can't bring a crane here to lift the pipe out of the chimney.
 
You can do that!
 
What can I do?
 
Cut into pieces. How long is the pipe?
 
You can take the pipe in any direction you want. The pipe in the picture has a 4mm wall thickness, I think. I can't recall there being any major problems getting it out upwards with two people. But that depends on how weak one is, of course.....
 
My pipe is 6-7 meters, and I managed to hold it myself. I had to cut off a meter when I changed the boiler. So if you are 2 people, it works.
 
Great, thanks for the quick and good response. It is just over 6m so I'll have to take it down and cut it. Another question for those who have done the same thing, there's nothing to consider after removing the pipe, regarding the chimney, I'm thinking!
 
If by murstock you mean the Corten pipe, then the metal casing and a lot of insulation inside will remain. Should that also be removed?
 
No, the corenten pipe must go down too, meaning I will take down and cut the pipe, insulation, and outer casing all in one. Everything must go!
 
Okay. In my case, the entire conduit pipe rested on the ceiling panel, so the pipe lay loosely in the insulation. However, I believe the sheet metal was anchored up in the attic....
 
No, in my case, it's one whole construction, i.e., they are welded together, hence it's somewhat heavier than what it was when you did it! But when you took down your pipe, did you leave the insulation and outer plate remaining in the chimney?
 
I still have mine. But it was when I changed the boiler that I needed to deal with it.
 
Electrical control panel with buttons next to a large metal ventilation pipe and cardboard boxes on a shelf in a utility room.

Basement boiler room showing heating controls, wrapped vent pipe, pressure gauges, and a green boiler unit for a building's heating system.
 
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