Another makeshift shortcut way of doing things.
A little close to the PVC pipe isn’t it?
Call it out.
Good one Dan.
Gas and Oil Appliance Venting
Gas fireplaces are factory-built systems. The manufacturer’s listing and instructions will preclude attaching any other appliances to it.
Multiple gas or oil furnaces or boilers, as well as hot water heaters, can be vented into one flue. There are a few rules to mention:
- The rules apply to listed appliances. While I have never seen an unlisted gas or oil furnace in my life, if you have one, you are referred back to the rules for solid fuel burning appliances- one per flue.
- If venting two or more appliances on the same flue, you have to know the flue can handle it, as determined but the BTU input and other factors.
- Both or all appliances have to be on the same floor. So, no furnaces in the basement or room heaters on the second level of your home.
- The connectors for the appliances have to be offset. They can’t come into the flue at the same height, and especially never directly across from each other.
- The smaller of the two connectors go into the flue above the larger one (usually meaning the hot water heater).
- As a general rule, don’t mix “natural draft” appliances and “fan assisted” appliances on the same flue. This rule is more complicated than this, but if this is your case, be sure you refer to the manufacturer’s instructions. Call and HVAC company and make them show you to your satisfaction it’s right. Don’t take anyone’s word for it, see it in writing.