The B-Vent Firestop Spacers are designed to ensure safe and efficient venting for Category 1 gas-burning appliances including furnaces, water heaters, boilers, pool heaters, gas fireplaces, and infrared tube heaters. These spacers are approved for use with Natural Gas (NG) and Propane (LP), providing optimal protection. With a maximum temperature rating of 243°C (470°F), they help maintain proper clearance and secure installation for safe, compliant venting systems.