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Useful links

Below are sites that contain information you may find helpful to your research.
Please do not hesitate to contact us if you still have some unanswered questions:
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Energy Star

http://www.energystar.gov/index.cfm?fuseaction=find_a_product.

National Fenestration Rating Council

www.nfrc.org

American Architectural Manufacturers Association

http://www.aamanet.org/index2.asp?sect=3

Efficient Windows Collaborative

http://www.efficientwindows.org/

Alside Inc.

http://alside.com/

Vinyl Siding Institute

http://www.vinylsiding.org/

http://www.vinylsiding.org/vsicert/sidingproduct/certifiedproducts/