There are 1 names in this directory beginning with the letter K.
An inert, nontoxic gas used in insulating windows to reduce heat transfer.
Steve B. of Potomac, Montgomery County, MD 20854
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I had Mr. Li (owner-Crystal Exteriors) install two exterior doors and one window. He was extremely reliable; both Mr. Li and his installers showed up precisely when they said they would. The workmanship was excellent, and they cleaned up well when they finished. I do not hesitate to recommend them."
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