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Norm Abram replies: The 5/8-inch, fire-code drywall (called Type X) increases a wall's fire rating to a minimum of 1 hour, from the 30-minute rating for standard Â½-inch drywall. And it's not just thickness that makes the difference. Type X has a denser core and contains glass fibers that keep it from crumbling in the heat.
Type B Vents are factory built double wall vent pipes that are only used to for venting gas. They are always made with a galvanized exterior and an aluminum interior. The air space between walls is fairly small. This vent can be used as a vent or connector, and is quite inexpensive. Type L vents can be either a vent or a connector, and is made to vent oil. Class A chimneys are still preferred in the market over L vents, and as such L vents availability is limited. Sometimes it is listed for âbio-mass ventingâ, or venting the products of combusting pellets, corn, cherry pits, etc.