A research project was conducted to find and evaluate remedial measures for combustion venting problems with gas-fired appliances. It was hoped to find measures that held promise for near- to mid-term commercialization. The project was one three projects conducted by a mu/ti-disciplinary team of scientists and engineers to investigate combustion venting remedial measures for several types of combustion appliances. The research represents one sub-project in an overall project to investigate residential combustion venting failure.