The 4″ Wall Thimble is for use with 4″ venting, through-the-wall installations. It provides a non-combustible clearance for vents when installing in combustible locations. It is adjustable from 4-1/8″ to 7″ to accommodate different wall thicknesses. The interior dimension is 4-5/8″, while the outer dimension is 8-1/4″. As with all of our B Vent components, it can be used with natural gas or liquid propane, Category 1 appliances.
A 1″ clearance to combustible materials must be maintained.
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