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Edge Effects Edge effects is the change in heat transfer at the edge of a window due to sealants, seals, and spacers.
Electrochromics Electrochromics is the process by which color can be changed using electricity. Researchers are working to develop windows with light blocking properties that can be altered by the flick of a switch. Current versions occlude the glass for privacy and work is underway to produce versions that cut down on UV.
Electromagnetic Spectrum The electromagnetic spectrum covers the entire range of radiation wavelengths from minute cosmic ray photons at 10-15 meters up through microwaves and radio waves to infinity. Visible light and infrared are part of this spectrum.
Emergency Exit Window Any window that opens outward to provide egress during an emergency. There is often a locking mechanism released by pushing a bar. Other designs for emergency exit windows are linked to emergency alarms that go off automatically when the window is opened. Building codes specify minimum dimensions, position, and materials.
Emittance Emittance is the power radiated per unit of surface area and is used to describe heat loss and energy efficiency. It is also referred to as emissive power or radiating power.
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