Busch Jet-Wall

Air-curtain hood provides enhanced fume capture efficiency for rolling mills and other process lines/machines.

This type of hood combines advantages of the Slotted Perimeter Hood with an air barrier designed to minimize fume exfiltration. Itís major advantages are that it minimizes fugitive emissions, reduces total emissions, lowers exhaust volume requirement, improves operator visibility, and better access for maintenance
This design utilizes the energy equation and theory of conservation of momentum to establish air-curtain parameters. It also uses the concept that for any given slot velocity the distance of an isovel (line of equal velocity) from a discharge orifice is approximately thirty times as great as the distance of the same isovel from the suction slot.

The Jet-Wall Hood was developed in response to problems in hood positioning associated with the increased complexity and size of industrial manufacturing equipment. In areas of high production, location of material handling equipment often tends to pre-empt ideal "close-capture" locations for hooding systems.

Since the combined volume of the jet stream and its entrained air must not exceed the volume of air being removed by the exhaust system, air-curtain design is critical. It is also important to limit the jet curtain terminal velocity to avoid the possibility of the jet stream/entrained air "bouncing" off the mill floor and dispersing fume into the operatorsí area.