What can be in contact with a class a pipe?

[Zzyk]

Might sound a bit crazy but I have a problem with rodents sneaking in around the pipe that runs from the house to the exterior block chimney. Its tight work there and wondering if there is something to use to seal the space between the aluminum siding and the pipe. Any help would be greatly appreciated.

 

[begreen]

You could use stove gasket rope or stainless steel wool.

 

[stoveliker]

And you could fill the above with silicone caulk if needed? Closes it off and the metal avoids chewing through.

 

[Zzyk]

Thanks for the great ideas! Was thinking along the same lines but didn't want to do something potentially hazardous.

 

[EatenByLimestone]

why not seal between the chimney and the house? Trim coil would seal tight and look good.