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// CODE SNIPPET

502.9.5.4 Use, Dispensing and Mixing

Mechanical Code of the Texas Industrialized Housing and Buildings Program > 5 Exhaust Systems > 502 Required Systems > 502.9 Hazardous Materials—Requirements for Specific Materials > 502.9.5 Flammable and Combustible Liquids > 502.9.5.4 Use, Dispensing and Mixing
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Continuous mechanical ventilation shall be provided for the use, dispensing and mixing of flammable and combustible liquids in open or closed systems in amounts exceeding the maximum allowable quantity per control area and for bulk transfer and process transfer operations. The ventilation rate shall be not less than 1 cfm/ft2 [0.00508 m3/(s • m2)] of floor area over the design area. Provisions shall be made for the introduction of makeup air in a manner that will include all floor areas or pits where vapors can collect. Local or spot ventilation shall be provided where needed to prevent the accumulation of hazardous vapors.
Exception: Where natural ventilation can be shown to be effective for the materials used, dispensed or mixed.

Related Code Sections


502.9.5.4 Exhaust Systems, Use, Dispensing and Mixing
Continuous mechanical ventilation shall be provided for the use, dispensing and mixing of flammable and combustible liquids in open or closed systems ...
Mechanical Code of the Texas Industrialized Housing and Buildings Program > 5 Exhaust Systems > 502 Required Systems > 502.9 Hazardous Materials—Requirements for Specific Materials > 502.9.5 Flammable and Combustible Liquids > 502.9.5.4 Use, Dispensing and Mixing
507.8.1.1.1 General Building Heights and Areas, Liquid Use, Dispensing and Mixing Rooms
Liquid use, dispensing and mixing rooms having a floor area of not more than 500 square feet (46.5 m 2 ) need not be located on the outer perimeter ...
Building Code of the Texas Industrialized Housing and Buildings Program > 5 General Building Heights and Areas > 507 Unlimited Area Buildings > 507.8 Group H-2, H-3 and H-4 Occupancies > 507.8.1 Allowable Area > 507.8.1.1 Located Within the Building > 507.8.1.1.1 Liquid Use, Dispensing and Mixing Rooms
412.6.3 Special Detailed Requirements Based on Use and Occupancy, Operations
control area in Table 307.1(1). Spray equipment cleaning operations shall be conducted in a liquid use, dispensing and mixing room ...
Building Code of the Texas Industrialized Housing and Buildings Program > 4 Special Detailed Requirements Based on Use and Occupancy > 412 Aircraft-Related Occupancies > 412.6 Aircraft Paint Hangars > 412.6.3 Operations
415.2 Special Detailed Requirements Based on Use and Occupancy, Definitions
LIQUID USE, DISPENSING AND MIXING ROOM. LOWER FLAMMABLE LIMIT (LFL). NORMAL TEMPERATURE AND PRESSURE (NTP). PHYSIOLOGICAL WARNING ...
Building Code of the Texas Industrialized Housing and Buildings Program > 4 Special Detailed Requirements Based on Use and Occupancy > 415 Groups H-1, H-2, H-3, H-4 and H-5 > 415.2 Definitions
502.9 Exhaust Systems, Hazardous Materials—Requirements for Specific Materials
502.9.5.1 through 502.9.5.5 for the storage, use, dispensing, mixing and handling of flammable and combustible liquids. Unless otherwise specified ...
Mechanical Code of the Texas Industrialized Housing and Buildings Program > 5 Exhaust Systems > 502 Required Systems > 502.9 Hazardous Materials—Requirements for Specific Materials
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