This is an essential series of safety tests that we perform in all combustion appliance zones (CAZ) prior to performing Blower Door and Duct Blaster tests. The combustion analysis of gas appliances includes your water heater, furnace, cooktop, oven, and fireplace. These tests include gas leak detection, combustion draft pressure measurements, and carbon monoxide production & spillage evaluations for each vented appliance. These tests are conducted under worst-case conditions. Combustion safety test results must be acted upon according to the Combustion Safety Action Level table. A preliminary and post-installation safety inspection of all combustion appliances must be completed whenever changes to the building envelope and/or heating system are part of the work scope. These tests are part of the required procedures for a Building Performance Institute certified building analyst professional.