In the Universal prefabrication category, we've put products that have multiple
functions and can be used for both round and rectangular ductwork.
Flexible duct connectors are used primarily for insulating air handling systems
and equipment from ductwork. Available in PVC-coated fabric, silicone
coated fabric, polyurethane coated fabric, neoprene coated fabric.
Another component that can be extremely useful for manufacturers of
air handling units are ILPL round to rectangular take-offs with gasket, we
recommend using a version with seals to achieve better airtightness, however,
take-offs without seals are also available.