Make up air controller for use with fume hood systems

Details Make up air controller for use with fume hood systems Make up air controller for use with fume hood systems

1986-11-24

1988-09-27

Joyce, Harold

98 331, B05B 1502

Patent

active

047733110

ABSTRACT:
Method and apparatus for varying the make-up air volume of an HVAC system used in conjunction with a laboratory fume hood. The invention maintains a constant difference in air volume between the total air volume exhausted from the laboratory, including the variable fume hood exhaust volume and the make-up and supply air provided by the HVAC system. The invention provides a continuous modulation of the make-up air volume which tracks the exhaust volume to maintain a constant preset differential between the makeup and exhaust volumes. The invention includes a preferred embodiment in which a signal from a sash height transducer is used to control the volume of make-up air.

REFERENCES:
patent: 3745908 (1973-07-01), Mayberry
patent: 4372195 (1983-02-01), Dorius
patent: 4483316 (1984-11-01), Fritz et al.
patent: 4528898 (1985-07-01), Sharp et al.

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