Marvin’s use of materials, technological design and advanced fabrication processes are backed by 40 registered patents. Many Marvin products qualify for Energy Star® Most Efficient rating and meet the energy efficiency criteria of the Passive House Institute US. ATMW offers window and door options from their six unique collections in wood, fiberglass and vinyl. Marvin is a family owned and operated business headquartered in Minnesota. They are committed to environmentally and socially sustainable business practices. They are a “vertically integrated” manufacturer meaning they produce all their own vinyl components for their windows and doors – including tempering their own glass. The same applies to their fiberglass and wood products – windows and doors are all done “in-house.” Why go to this depth? To maximize quality control.