Darren Posted January 14, 2010 Report Share Posted January 14, 2010 After about 13 years, this is a first for me. My question would be is the fan changed; after all a cat III is 'under pressure' while a cat I is 'atmospheric'. Click to Enlarge 44.52 KB Quote Link to comment Share on other sites More sharing options...
hausdok Posted January 14, 2010 Report Share Posted January 14, 2010 Just a wild guess; but a 3-inch vent is consistent in size from the boiler to terminus. so pressure ranges within the vent are probably equal anywhere along its length. However, when you vent into a chimney using a short connector the chimney flue will be far larger, and can vary in size along its length, so the atmospherics would be inconsistent from boiler to terminus. ONE TEAM - ONE FIGHT!!! Mike Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted January 14, 2010 Report Share Posted January 14, 2010 After about 13 years, this is a first for me. My question would be is the fan changed; after all a cat III is 'under pressure' while a cat I is 'atmospheric'. I don't recall having ever seen that either. There was a thread a few weeks ago regarding an attic-mounted furnace that vented horizontally. I was emphatic about that furnace being a category I unit. Now I wonder. What make & model is the furnace in that picture? - Jim Katen, Oregon Quote Link to comment Share on other sites More sharing options...
Darren Posted January 14, 2010 Author Report Share Posted January 14, 2010 It's a Peerless Boiler. Excuse the out of focused spec plate photo. Click to Enlarge 57.76 KB Click to Enlarge 40.23 KB Click to Enlarge 33.45 KB The PVC is the gas water heater exhaust. Click to Enlarge 64.55 KB Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted January 14, 2010 Report Share Posted January 14, 2010 My question would be is the fan changed; after all a cat III is 'under pressure' while a cat I is 'atmospheric'. There's no change of fan. If venting into a chimney, the flue connector dimension is increased to significantly reduce internal pressure. An increaser would be installed on the 3" fan adapter and a 5" vent connector would be installed. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.