Glossary A

Aerator A small, removable extension at the tip of a sink faucet that mixes streaming water with air to reduce splashing and conserve water. Air hammer A banging noise in plumbing pipes caused by air infiltration. Airway The space between roof insulation and roof boards which allows for movement of air. Alkali A soluble mineral salt or mixture of salts capable of neutralizing acids. Anchor bolts Bolts that secure a wooden sill plate to a concrete or masonry floor or wall. Asphalt A residue from evaporated petroleum, insoluble in water but soluble in gasoline. Melts when heated. Attic ventilators Screened openings provided to ventilate an attic space.
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