Are screws allowed in gas dryer vent installations?

In gas dryer vent installations, screws are not allowed because any penetration into the airflow can create potential hazards, including the risk of lint build-up, which can lead to restricted airflow and an increased fire risk. When screws are used to secure ducting, they may interfere with the smooth flow of air, allowing lint to accumulate around these protrusions. This accumulation can not only obstruct airflow but also pose significant safety risks when running the dryer, which is why the use of screws in the airflow path is prohibited.

The regulations governing vent installations prioritize safety and efficiency, aiming to ensure that exhaust systems facilitate the safe expulsion of gases and lint. Therefore, avoiding any fasteners that penetrate into the airflow is essential to maintain the integrity and effectiveness of the dryer vent system. This focus on safety and the mechanics of airflow is why the correct answer is that screws are not permitted in gas dryer vent installations.