RTV for PVC Exhaust flue?

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Old 02-06-08, 05:26 AM
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RTV for PVC Exhaust flue?

I've a York 90% gas, hot air furnace. Service guy replaced gasket on condenser box and had to take off inducer fan to get box off. The PVC exhaust flue pipe was connected to the fan port by a screw. Installation instructions say to RTV this connection and a screw. The tech said RTV wasnt' needed and was actually better for preventing furnace from stopping if exhaust flue was blocked since not being sealed with RTV would allow for relief. Sounds dangerous to me.
Should I RTV this connection and is any RTV sealant ok to use (blue stuff used for car engines?) or what is recommended?
TIA,
Bob
 
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Old 02-06-08, 10:30 AM
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The screw is presumably there to keep the vent pipe in place. The caulk is there to provide a good seal.


Using caulk would be a good practice, at the cost of making it difficult to remove the vent pipe for repairs/inspection/maintenance.


A pressure switch in the furnace checks to be sure the furnace is venting properly --- an uncaulked vent pipe wouldn't be of much help were a problem to develope.
 
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Old 02-07-08, 07:31 PM
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Ok, RTV is needed.
What kind is best? Any old 100% silicone or something special?
THanks,
Bob
 
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Old 02-09-08, 07:17 AM
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bump on the kind of RTV to use please.
 
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