Flue Pipe installation

Okay... what is the proper position for the seam on flue pipe--seam up or down? Also, does it make any difference whether the female or male end of the pipe is towards the boiler or away from it? Pete Seams down, Crimped (male) edge away from the boiler. Use sheet metal screws to hold the pipes together. Just the opposite of what's called for regarding wood stove flue piping??? What about a combination wood/oil/boiler then? Is this a Code requlation, or good practice? Pete How the flue pipe M to F run on any vent or smoke pipe . Is the male end points to the wall flue away from the furnace or boiler and wood stove That part about the male pipe end pointing to the wood stove . Goes way back. To when the stove sat out in the center of the room or near the wall. The smoke pipe came off it and would go straight up and out the roof. Now this was black flue pipe.out in the room where all could see .If any rain water got into it or ran down it from the roof jack . With the female end going up any water on the outside of the pipe running down would and could run back into the pipe. Not make marks on the outside of the pipe. You could even get the black for it and like renew the black on the pipe each summer. So With what we have today for the flue you for sure run the smoke pipe with the male end comeing away from the furnace. Now on the seams they can go where ever you want. BUT If you have to cut in a barometic damper put the seam on the side so its away from where you have to cut out for the damper. ED just my .02cents Originally Posted by radioconnection What about a combination wood/oil/boiler then? Is this a Code requlation, or good practice? Pete Be careful if you are venting both wood and fossil fuels (oil, gas) in a common chimney or vent. I believe in most places this is against code. The wood can cause creosol buildup and prevent the fossil fuel appliance to vent properly A multifuel boiler is permitted into a single flue; but a solid fuel appliance must be vented into it's own flue--it can't share the same flue as an oil boiler. Originally Posted by radioconnection A multifuel boiler is permitted into a single flue; but a solid fuel appliance must be vented into it's own flue--it can't share the same flue as an oil boiler. Provided the multifuel boiler only has one breeching. If there are separate breechings for the solid fossil fuel sides they must go into separate flues.

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