The other thing I forgot to mention here that some of the old furance some are gravity curicationed { sans force air blower } as warm air rise the cool air sink that how it work on old furnce but one major gotcha what many oldtimers know do not overfire {overfueled} them.

Merci,Marc

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