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| Blockbusting
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The illegal act of inducing homeowners to sell their homes or properties by representing that persons of another race are entering the neighborhood. |
| Blocking
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Pieces of wood built into a roof assembly used to stiffen the deck around an opening, support a curb, or for use as a nailer for attachment of membranes or flashing. |
| Bloom
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A natural mealy or waxy coating covering the leaves of some house plants. |
| Blow
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The separation of layers in a plywood panel, usually caused by the buildup of steam pressure when the panel is being manufactured. Moisture with in the veneer, excessive glue spread or high press temperatures may be responsible for the steam. |
| Blow torch
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A torch used to solder pipes, activated by pressurized fuel and air to generate its flame. |
| Blowbag
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A type of garden hose nozzle used to clear clogged drains. |
| Blowdown
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(1) Partial venting or draining, under pressure, of the water side of a boiler to remove or decrease unwanted contaminants. (2) Pressure drop in a pressurized vessel from the opening of a safety relief valve to the resetting of the valve. |
| Blower (fan)
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An air handling device for moving air in a distribution system. |
| Blower door
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A large powerful variable-speed fan mounted in a doorway that blows air into (pressurizes) or sucks air out of (depressurizes) a house. It's used to test for air leakage in a house. The size and complexity of the fan varies, but all blower doors have adjustable frames around the fan so that they can fit snugly into most doorways. |
| Blown in insulation
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An insulation product composed of loose fibers or fiber pellets that are blown into building cavities or attics using special pneumatic equipment. |
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