Glossary

A mechanical fan, located in the attic space of a residence; usually moves large quantities of air at a relatively […]

An audio listening device used to detect sounds of breaking and entering a building or a secure area within a

Any frequency of oscillation of a sound wave which is audible; usually in the range between 15 and 20,000 Hz

An opening that is placed in the drywalled ceiling of a home providing access to the attic.

A test for determining the plasticity of soils.

A propeller fan used to exhaust the air within an upper space of a house (such as a garret).