How to Install a Roof Vent. Roof vents are devices that allow the moisture in a house to escape, which prevents the growth of mold and mildew. Roof vents also help to keep wood rot, which is a form of fungal decay, from developing in the house. Roof vents are made of plastic or metal, and are also known as turbine vents.
The National Association of Social Workers (NASW) is the largest professional association of social workers in the world. As the only organization dedicated to advocating for the entire profession of social work, NASW strengthens the social work profession and gives social workers and clients a stronger voice.
NAS - National Aerospace Standards, started in 1941 is handled by the Aerospace Industries Association a group of aerospace companies From their brochure: The NAS series is best known for its state-of-the-art, high strength, precision fasteners. In addition to all types of screws, nuts, and rivets, NAS standards define high pressure hose, electrical connectors, splices and terminations, rod end bearings, and many other types of hardware and components.