Lindemann B-Vent 4" Wall Thimble in Silver

Use for through-the-wall system to provide clearances for vent from combustibles. Adjusts from 3 " to 6" to accommodate various wall thicknesses. Larger diameter wall thimbles are field-fabricated. DuraVent s Type B Gas Vent system. Use with natural gas or liquid propane category I and draft hood equipped appliances, and appliances tested and listed to use Type B Gas Vent. Applications include: natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating applications. This Wall Thimble for Type B Gas Vent is used when passing pipe through a combustible wall, and can adjust from 3 1/2" 6" depending on wall thickness. Trim Collars (page 48) can be used in conjunction with the wall thimble as a decorative collar.