Which of the following is true about the vent termination of a gas dryer?

The correct answer is that the vent termination of a gas dryer must exit outside. This requirement is crucial for safety and efficiency. Gas dryers produce moisture and combustion gases during operation, and if these byproducts are not properly vented outside, they can accumulate indoors, leading to moisture problems and potentially hazardous conditions, including the risk of carbon monoxide buildup. Therefore, venting to the outside ensures that all combustion products, along with moisture and lint, are safely expelled to the exterior of the building.

The other options can lead to unsafe conditions or do not adhere to building codes. Ventilation through the attic can trap moisture and lead to mold growth, while adjustable screens are obstructive and can restrict airflow or become clogged with lint. Additionally, venting into a crawl space is not advisable because it can create an environment that encourages moisture accumulation and does not effectively remove harmful gases and byproducts from the living spaces.