I have other question to ask ya for the 4 inch insterst what class pipe you are seeing it ? if class A forget it it will get more than just warm engouh to get the cable get soft and can cause short circuit.

Class B is iffy question depending on how big the fireplace burner is.

Really I am not too crazy to leave it hanging loose in the chimeny area especally too close to the pipe.

Merci.
Marc

Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)