The B-Vent 90° Elbows are essential fittings for venting systems in Category 1 gas-burning appliances, including furnaces, water heaters, boilers, pool heaters, gas fireplaces, and infrared tube heaters. Designed for use with Natural Gas (NG) and Propane (LP), these elbows feature a durable Galvalume or aluminized outer casing and an aluminum inner liner. With a maximum temperature rating of 243°C (470°F), they ensure safe and efficient venting. The unique construction, with an annular air space between the casing and liner, provides reliable performance and durability in heating systems.