Ductless Hood Our ductless hood units are not number one in the world by chance. Because of our efforts generated by our applied research laboratory and our fully integrated manufacturing resources, the efficiency of our ductless hood filtration technology and the quality of our products are constantly improving. Our efficiency is proven by its compliance with the most demanding ductless hood standards, bringing the level of safety needed to protect the user’s health (standards relating to filtration quality and containment efficiency of the enclosure). It is not enough to claim to comply with the most demanding standard worldwide concerning the protection of the ductless hood user, it is necessary to prove it.