Patent ID: 7819727
Filing Date: 2010-10-26
Classification: B08B

Abstract:
1. A computer-based method of manufacturing a push-pull type ventilation hood having a push device to obtain a push air flow and a pull device to exhaust contaminant flow with an exhaust opening, when the push flow flows through a contaminant source, a contaminated flow of the push flow is exhausted through the exhaust opening, a pull hood flange is set vertically to the direction of the push flow and the pull device, which comprises the steps of: a) determining a liquid-surface rising velocity (vg) and a ratio of a chemical tank length (H) to a pull hood opening height (D) (H/D); b) determining a smallest pull velocity (v c) determining a smallest push velocity (v d) determining a corresponding slope (S) utilizing a corresponding slope-definition; e) selecting a push velocity (v f) determining and outputting a pull velocity (v and g) outputting push-pull type ventilation hood design parameters on a computer based on computer calculations performed in steps a-f.