hopper vent

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.
References in periodicals archive ?
For example, regular cleaning or replacement of hopper vent filters will minimize transient pressure buildup in the feeder's supply hopper during refill.
Decks and cowls provide solar shading and doors are designed with integral high level hopper vents for secure night-time cooling.