What does an inspector note about vent connectors secured with sheet metal screws?

Vent connectors carry combustion products from an appliance to the chimney or vent, and every joint in that path has to stay together. Sheet metal screws are the standard mechanical fastening — typically three per joint, evenly spaced — and they are what prevents sections separating from vibration, thermal cycling or someone bumping the pipe during service. A separated connector dumps flue gases, including carbon monoxide, directly into the room. So screws at the joints are a correct condition the inspector confirms, not a defect. The finding to look for is the opposite: joints with no fasteners, sections merely pushed together, or connectors held with tape, all of which are common and all of which can come apart.

Screws mechanically fasten vent connector sections so they cannot separate from vibration, thermal movement or contact. A separated connector releases combustion products into the space, which is what the fastening prevents.

Vent connectors are assembled with the crimped end toward the appliance and joints secured with sheet metal screws, commonly three per joint. Connectors also require adequate rise, support and clearance to combustibles.

Screws Hold the Exhaust Together. Finding them is correct work; finding none is the defect.

Check orientation too — the crimped male end should point toward the appliance so condensate runs back rather than dripping out of the joint.

• •Reporting correct fastening as a defect
• •Overlooking joints with no fasteners at all
• •Missing reversed connector sections that let condensate escape