Since 1973, Double L Group has provided high-quality products & services worldwide based on value, customer needs, & excellent sales support. We are a leading manufacturer/distributor of innovative ventilation production equipment resulting in cleaner air, lower heating costs, & improved litter quality. Products include: DirectAire Insulated European Curved Inlets, Insulated Ceiling Sidewall Inlets, Insulated 360° Attic Inlets, DirectAire Stir Fans, EcoTight Shutters, & Wind/Sun Deflector Hoods.