freetown fred wrote:None to my knowledge. Just another money maker for somebody or other.
None to my knowledge either, I just wondered if IOF was referring to something I hadn't run across.
I'm On Fire wrote:Yeah, i just looked thrrough some NFPA documents myself and I too can't find the "Why" I have only found that it is not allowed per code. I'm sure there are many reasons why, but I cant give you a definitive reason.
I asked a long-time code office about it once. He said it came about after the early 70's oil crisis when everyone added wood stoves/boilers to their existing chimneys. When a wood-burning appliance is connected to the same flue as an oil or gas appliance, the flue temps tend to be lower from the additional air pulled through the oil/gas unit's draft control. That increases creosote formation...and when there is a chimney fire, the draft control opens and feeds lots of air to the chimney fire. Many homes were burned down from this, and many more had the chimneys damaged or destroyed.
Thankfully anthracite doesn't create creosote. I have run coal stoves vented into the same flue as an oil boiler, same with EFM stokers and I know of a Keystoker boiler hooked up that way as well. All draft fine and operate fine, the only issue is code-compliance.