- Apr 18, 2012
- 2
Does anyone know for sure what size the chimney should be for a Caddy Add-on used with a propane furnace? The manual is vague and when calling numerous dealers, they're giving us different answers, both 6" and 7". We contacted PSG and still couldn't get a straight answer. I don't want it to burn too hot and have to get up in the middle of the night to stoke it. It was rated with an EPA efficiency and all I want to know is what size pipe to use to get that efficiency.