Metal Flue Pipe Holes

Holes in metal flue pipes that extend from gas appliances can create a hazard. They may also indicate significant home performance issues. Signs of Condensation The products of gas combustion should stay warm enough to flow up the chimney without condensation. Watch for signs of poor draft of gas combustion, such as condensation and rust on the metal flue pipe from the appliance to the chimney (Photo 1). Photo 1. Signs of Condensation Photo 2 shows a severely rusted flue pipe. If you look closely, you can see rust through the elbow ...