Nortek Holdings, Inc., formerly known as Nortek, Inc. is a diversified manufacturer of residential and commercial building products, operating within three principal segments: the Residential Building Products Segment, the Air Conditioning and Heating Products Segment, and the Windows, Doors and Siding Products Segment. Through these segments, the Company manufactures and sells, primarily in the United States, Canada, and Europe, a wide variety of products for the residential and commercial construction, manufactured housing, and the do-it-yourself (DIY) and professional remodeling and renovation markets.Nortek Holdings, Inc. is a manufacturer and distributor of high-quality, competitively-priced building products for residential, light commercial, and commercial applications.