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| Flux-cored electrode
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Hollow consumable welding electrode that has a flux core. |
| Fly ash
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The fine particulate matter entrained in the flue gases of a combustion power plant. |
| Fly cutter
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Cutting tool, attached to a shaft or arbor, which is used to cut circular sections out of material. A drill motor turns the arbor making the bit revolve around the arbor. The adjustable arm can change the diameter of the hole that can be cut, by increasing or decreasing the distance of the bit from the arbor. |
| Fly rafter
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Also referred to as a barge rafter, it is the rafter at the gable end that's attached to the roof sheathing above and the lookout blocks, which are behind the rafter. |
| Flying levels
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An approximation of elevations made when surveying. |
| Flywheel
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Wheel that is attached to a rotating shaft to reduce fluctuations or pulsations in its rotation by the addition of weight. |
| Flywheel effect
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The damping of interior temperature fluctuations by massive construction. |
| Foam
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(1) Rigid or spongy mass formed by the dispersal of gas bubbles. (2) Whitish mass of bubbles, which are formed, on the surface of liquid. |
| Foam board
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A plastic foam insulation product, pressed or extruded into board-like forms, used as sheathing and insulation for interior basement or crawl space walls or beneath a basement slab; can also be used for exterior applications inside or outside foundations, crawl spaces, and slab-on-grade foundation walls. |
| Foam core panels
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A type of structural, insulated product with foam insulation contained between two facings of drywall, or structural wood composition boards such as plywood, waferboard, and oriented strand board. |
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