Double L is a leading designer, manufacturer and supplier of ventilation and flooring products for the commercial poultry and swine industries. Founded in 1973, products include ceiling and side-wall inlets, farrowing crates, circulation fans, and a diverse line of plastic and metal flooring products. The products are engineered and designed to make facilities more efficient and hygienic, and present a compelling return on investment based on improved animal yields and reduced energy costs.