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Some popular brands:* Service-Pro by Curtron* Eliason == Eliason Brand Swinging Doors ==Restaurant owners, architects and specification writers choose this series for its durability and beauty. The SCG and HCG models areideal for use in walk-in coolers with a temperature differential of 10-30 degrees. The FCG and HFG series with foam insulation are used in areas with a temperature differential 25 to 50 degrees.* http://www.eliasoncorp.com/Food%20Service.htm