Reducing edge losses in multilayer curtain type window shutters.

One limiting factor in achieving optimum thermal performance in shutters is air leakage around the shutter edges. Describes a motor driven shutter using multilayer curtains employing a magnetic type edge seal. Measures the thermal performance of 2-layer and 4-layer shutters using a controlled environment chamber. The 2-layer shutter performs as well as a similarly sized unit in which the layers ar permanently sealed. The 4-layer unit does not perform as well as expected because of air leakage between cells at the top of theshutter.