Fume hood exhaust stack system

Details Fume hood exhaust stack system Fume hood exhaust stack system

2005-05-10

2005-05-10

Joyce, Harold (Department: 3749)

Ventilation

Workstation ventilator

Covered workbench chamber

C454S027000

Reexamination Certificate

active

06890252

ABSTRACT:
A fume hood exhaust stack system (10) and method utilize a variable speed fan (24) and an exhaust stack (28) having an adjustable cross-sectional area. Toxic exhaust from one or more fume hoods (12) is conveyed through a header (16) to the fan. The fan forces the exhaust through the exhaust stack, and the exhaust is then discharged into the atmosphere at a sufficient velocity and momentum to ensure that the exhaust reaches an environmentally sound altitude. A variable speed drive (36), programmable controller (34), flow signals (26), and static pressure and total pressure signals (20) are utilized to modulate the speed of the fan and the area of the exhaust stack to maintain the desired fan inlet pressure and exhaust velocity.

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