Slot hood capture velocity

local exhaust (see Figure III:3-1. At two duct diameters from the hood opening, capture velocity. The average velocity of air through a slot. Slot velocity is.Because velocity varies with distance from the edge of the duct, a single measurement may not be sufficient.Z9.3 - Design, Construction, and Ventilation of Spray Finishing Operations.This section of the manual addresses ventilation in commercial buildings and industrial facilities.


A sectional drawing provides duct or component detail by showing a cross-section of the component.

Are variable-flow devices like dampers, variable-frequency drives, or inlet vanes in use.The system should be designed not to recirculate air during equipment malfunction.

Specific points to consider during any investigation of a ventilation system include emission source, air behavior, and employee involvement.Controlling Lead Exposures in the Construction Industry: Engineering and Work Practice Controls.

A typical local exhaust ventilation system is composed of five parts: fans, hoods, ducts, air cleaners, and stacks.The employer should train employees in the use and operation of the system.Hoods must meet the design criteria in the ACGIH Industrial Ventilation Manual or applicable OSHA standards.The difference between two absolute pressures, one of which is usually atmospheric pressure.A device on the end of a ventilation system that disperses exhaust contaminants for dilution by the atmosphere.Maximum distance from the emission source should not exceed 1.5 duct diameters.Hood placement must be close to the emission source to be effective.Traditionally, nonindustrial ventilation systems commonly known as heating, ventilating, and air-conditioning (HVAC) systems were built to control temperature, humidity, and odors.

Welding, cutting and brazing--Health protection and ventilating--Ventilation in confined spaces.Air flow in industrial ventilation ducts is almost always turbulent, with a small, nonmoving boundary layer at the surface of the duct.Area may refer to the cross-sectional area of a duct, a window, a door, or any space through which air moves.2 Interior Front Corner of Hood Showing Interior Slot 3. 9 Capture and Containment Results Full-Size Convection. 12 Filter Cartridge Slot Velocity Readings 17.Worker complaints, improper use of system, nonuse of system, alteration of system by employees.

Hot-wire anemometers should not be used in airstreams containing aerosols.By increasing capture velocity further from the face, contaminant capture could take place at distances more convenient to the circular slotted-hood operator while maintaining adequate suction.The equipment or operation associated with the supply or exhaust of air by natural or mechanical means to control occupational hazards in the industrial setting.

Routinely Check Hoods for Adequate Flow and Velocity

The static pressure lost (in inches of water) when air enters a duct through a hood.The system should remove as much of the contaminant as can economically be separated from exhaust air.If the upward velocity is greater than the hood face capture velocity. Note that the open area is essentially limited to the hood slot through which the metal is.An industrial ventilation system that captures and removes emitted contaminants before dilution into the ambient air of the workplace.Ventilation and protection in welding, cutting and heating--Welding, cutting and heating in confined spaces.The ventilation system interferes with work or worker productivity and leads workers to bypass the system.A curve relating pressure and volume flow rate of a given fan at a fixed fan speed (rpm).EVALUATION OF EXHAUST VENTILATION SYSTEMS. Take measurements to characterize capture velocity and the effect of. determine the average hood slot or face.

OSHA Field Operations Manual. 1992. OSHA Instruction CPL 2.45B. Washington, D.C.: U.S. Government Printing Office.Some systems are designed to provide individual control of rooms in a multiple-zone system.Replacement air can be supplied naturally by atmospheric pressure through open doors, windows, wall louvers, and adjacent spaces (acceptable), as well as through cracks in walls and windows, beneath doors, and through roof vents (unacceptable).CAPTURE VELOCITY WITH SLOT ENTRY TO CONICAL HOOD by. Local Exhaust Ventilation…. considered the best exterior hood in terms of capture efficiency,.Methods of Testing Air-Cleaning Devices Used in General Ventilation for Removing Particulate Matter.National Institute for Occupational Safety and Health (NIOSH). 1987. Guidance for Indoor Air Quality Investigations.This page requires that javascript be enabled for some elements to function correctly.

Mechanical air-handling systems can range from simple to complex.The hood should be designed to achieve good air distribution into the hood openings so that all the air drawn into the hood helps to control contaminants.

How to select a hood for an industrial ventilation system

NC-NCO040NPNA-04.2-Liter Chamber Testing - VetEquip Inc.

Prevent buildup of moisture in occupied spaces (relative humidity of 60% or less).A well-designed system and a continuing preventive maintenance program are key elements in the prevention and control of ventilation system problems.See Section III, Chapter 2, Indoor Air Quality, for a discussion of common indoor-air contaminants and their biological effects.

A Slot Hood Is Being Used To Exhaust A Dip Tank. T

Inside duct diameter is the most important measurement, but an outside measurement is often sufficient for a sheet metal duct.

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