Canopy Hood, Round Collar

An extraction hood for a round duct: a skirt round a rectangular opening, a rectangle-to-round sloping part and a round collar, in the middle or against a wall. An extraction hood for a round duct: an upright skirt round a rectangular opening, a rectangle-to-round sloping part and a round collar, with the collar in the middle or against a wall.

• Island hood
• Wall hood

How the canopy hood, round collar is developed, with a worked example · Hoods, plenums and cyclones