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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, AC, geothermal heat pump, and furnace repair, service, replacement, and maintenance company located in St. George. Southwest Air Conditioning Heating & Energy LLC employs only the best HVAC technicians for your air conditioner, heater, and furnace repairs and replacements in St. George UT and surrounding areas. We proudly service St George, Washington, Hurricane, Santa Clara, Central, Enterprise, Gunlock, Ivins, La Verkin, Leeds, New Harmony, Rockville, Springdale, Toquerville, Virgin, Pine Valley, Veyo, and Dammeron Valley. So, when you ask to find "A good HVAC company near me," you've come to the right place. To get an estimate on your furnace repair or installation, 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
For Furnace repair in St George UT, like us on Facebook!
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!
FREE QUOTE  
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