Southwest Air Conditioning Heating and Energy LLC
3662 S River Road, Bldg A3 St. George, UT 84790

Allowable Exposure Levels to Carbon Monoxide

Allowable (Legal) Limits for Carbon Monoxide

Occupational Safety & Health Administration, USA (OSHA) (for industrial situations) -

Permissible Exposure Limit (PEL, by TWA) - 50 ppm, 8 hrs.
Old PEL Standard (by TWA) - 35 ppm, 8 hrs.
Threshold Limit Value (TLV, by TWA) - 25 ppm (29 mg/cu. m)
(recommended by American Conference of Governmental & Industrial Hygienists ACGIH)
Ceiling (max. value, 15 min.) - 200 ppm (229 mg/cu. m)

MI Occupational Safety & Health Administration (MIOSHA) -

PEL (Industry, by TWA) - 35 ppm, 8 hrs. (38.5 mg/cu. m)
PEL (Construction, by TWA) - 50 ppm, 8 hrs. (55 mg/cu. m)
Ceiling (max. value) - 200 ppm (229 mg/cu. m)

Environmental Protection Agency, USA (EPA) -

Domestic, outdoor air, all ages (TWA) - 9 ppm*, 8 hrs.
Domestic, outdoor air, all ages (TWA) - 35 ppm, 1 hr.

World Health Organization (WHO) -

Domestic, outdoor air, all ages (TWA) - 9 ppm*, 8 hrs.

American Society of Heating, Refrigeration & Air Conditioning Engineers (ASHRAE) -

Indoor air (leakage at a heat register) - 9 ppm

American Gas Association -

Indoor air (leakage at a heat register) - 15 pm


TWA - Computed by making measurements at intervals over 8 hours, then adding the sums of the concentrations and the intervals, and dividing by 8 hours (480 min.). * Based on several published studies of people with coronary ischemic disease showing ECG changes during moderate exercise when breathing concentrations of CO giving 3% COHb.
Southwest Air Conditioning Heating & Energy LLC, is an Utah (UT) Heating, Cooling, Air Conditioning, Geothermal Heat Pump, and Furnace repair, service, replacement, and maintenance Company located in Washington County. Southwest Air Conditioning Heating & Energy LLC employs only the best technicians for air conditioner repairs and, furnace repairs as well as all air conditioner replacements, and furnace replacements in St George UT, Washington UT, Hurricane UT, Santa Clara UT, Central UT, Enterprise UT, Gunlock UT, Ivins UT, La Verkin UT, Leeds UT, New Harmony UT, Rockville UT, Springdale UT, Toquerville UT, Virgin UT, Pine Valley UT, Veyo UT, and Dammeron Valley UT. So when you ask to find "A good Heating, Cooling, Air Conditioning, Geothermal Heat Pump, and furnace repair or service company near me," you've come to the right place. To set-up a repair service estimate or replacement estimate, call 435-673-4877. Southwest Air Conditioning Heating & Energy LLC services all furnace, AC, humidifier, filter, thermostat and water heater brands including Carrier, Bryant, Payne, Trane, Lennox, Rheem, Ruud, Amana, Crown, Frigidaire, Gibson, Goodman, Lochinvar, Maytag, Weil McLain, A O Smith, Kohler, American Standard, GeoExcel, General, Aprilaire, Honeywell, White Rodgers, Dynamic and Skuttle.
24 hour emergency available!
CALL US TODAY • 435-673-4877 • OR • FILL OUT OUR FORM
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For Heat Pump repair in Hurricane UT, visit us on Google!
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3662 S River Rd. Bldg A3 St. George, UT 84790
MONDAY - FRIDAY: 7:30AM TO 4:30PM
For Furnace repair in St George UT, like us on Facebook!
For Heat Pump repair in Hurricane UT, visit us on Google!
For Furnace repair in Hurricane UT, check out our Yelp!
3662 S RIVER RD. BLDG A3 ST. GEORGE, UT 8
MONDAY - FRIDAY: 7:30AM TO 4:30PM
24 HOUR SERVICE AVAILABLE!
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