Have you ever reviewed the specifications for windows and wondered exactly what the window ratings mean? Most times the first thing you see is either a LC, C, HC, or AW followed by numbers usually 50, 55, 65, and 70 and so on. LC stands for light commercial, C stands for Commercial, HC stands for Heavy Commercial, and AW stands for Architectural Windows. The number represents the design load that the window has been designed and performed to in PSF (Pounds per Square Foot). If you see a rating of HC70 then that windows has been tested and passed all prevailing standards for air and water to meet the HC rating and has passed the structural standards for deflection of 70 PSF. On the structural side to meet the 70 PSF design load it must have been tested and passed the same structural test but at 1.5 times greater, or 105 PSF. If you need any more info on ratings or help selecting a product please contact your sales representative or us direct here at the factory, we will be more than happy to assist. Please go to www.ccbpwin.com for details (CAD and PDF), test reports, specifications and architectural brochure sheets. If you need additional assistance please contact us at 800-668-1645 ext 174 or send a request for info or a quote request direct from our website.
Kelly Townsend
National Sales Director
Columbia Commercial Building Products, L.L.C.

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