Comfort warrants that the sealed glass component of insulated glass shall be free of defects resulting in material obstruction of vision or film formation caused by dust or moisture on the internal surface of the sealed unit. Imperfections such as small scratches or reflected distortions from tempering, Low-E coatings or heat strengthening processes, are to be expected and are not covered. Small imperfections in the glass or vinyl framing that cannot be detected at a distance of 10 feet from the window are not considered a defect.