Ferrule A metal sleeve or tube that has various uses. A ferrule can be used to divert water from a fireplace flue chase where the flue passes through the cap. A bushing used to secure a pipe joint.
Fibrous A term used to describe a material that consists of fibers. An example is fibrous aluminum paint used to cover a felt built-up type roof.
Filter Lab A trade name of a company that manufactures electronic air filters for use in air conditioning systems.
Fireplace mantel The horizontal shelf in the face of a fireplace that exists across the top of the firebox opening.
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