The Impact Plus MDF door is the product line that launched our company. In 1957, when our doors with 3/4 in. solid MDF panels, ball bearing rollers and low profile threshold first hit the market it quickly became the top choice for Manhattan developers and architects. From Turner Construction when they built the Hofstra Dormitories on Long Island to HRH Construction when they built The Trump Towers, developers continue to purchase our Impact Plus bi-fold and sliding doors. Today this product is bought by contractors, homeowners and developers alike.