Butterfly valve with asbestos?

[MalinStr]

Could this gap have so-called asbestpapp? In the actual ventilation passage, no eternit duct is visible as far as I can see, or?

 

[MalinStr]

Can this gap have so-called asbestos paper? In the ventilation duct itself, no asbestos cement channel can be seen as far as I can tell, or?

 

[jonaserik]

Answer no, tap on it and it will make a metal sound, usually made of cast iron.

 

[Staffans2000]

Exactly. As you can see for yourself, there is no asbestos there. Older versions of the same valve were insulated with an asbestos sheet on the inside. Usually, it's long gone due to the wear and tear over time.

Staffans

 

[BigR]

I have this in the garage exhaust air. Keeping it in active service as a cultural relic. It's difficult to get hold of real asbestos cardboard these days

 

[Stefan1972]

I have some in operation with cardboard on........probably sitting in the basement in the boiler room I think.

 

[MalinStr]

Exactly. As you can see for yourself, there is no asbestos there. Older versions of the same valve were insulated with an asbestos board on the inside. Usually, it has long since disappeared due to the passage of time.

Staffans

This one is from the 60s so it could have been there.

 

[Staffans2000]

This is from the 60s so it could have been there.

Certainly. But with the passage of time, the insulation board has scattered to the wind.

Staffans