Encyclopedia

hopper ventilator

hopper light

hopper light
1. A window sash which opens inward and is hinged at the bottom; when open, air passes over the top of the sash; also called hopper vent or hopper ventilator.
2. A window sash which opens inward and is hinged at each side; when open, most of the air passes over the top of the sash but there is some flow through a narrower opening along the bottom.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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