I have exactly the same furnace and am looking to get the fan relay working. Mine is a 24v relay on the side of the relay, and I have a wire running from "G" on my thermostat that controls the fan. Where do I hook it in? I have the pull out man/auto switch on the Honeywell fan limit control, but don't know where to attach or how to wire the relay so I can run the fan independently. Most importantly, I want to make sure I'm not shorting or burning anything out having 2 relays hooked up. [color=#c0392b]Separated from this thread....[/color] [b][url=https://www.doityourself.com/forum/gas-oil-home-heating-furnaces/601457-lincoln-barriere-lbo-105-dr-issues.html]Lincoln-Barriere-LBO-105-DR-issues.[/url][/b]

I am installing a Bryant 915SB Furnace/AC in my detached garage. What size Concentric Vent should I be using (2", 3") ?