Allow Contemporary Air Systems, Inc. to repair your Ductless Air Conditioning in Joppa MD
Over 100 5-Star Reviews
(410) 391-3070
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Office Hours: M-F: 8:30a.m. - 5:00p.m. • SAT: 8:30a.m. - Noon
Master H.V.A.C. License# 6626 • Master Gas Fitter License# M11296

Allowable Exposure Levels to Carbon Monoxide

Contemporary Air Systems, Inc. has certified technicians to take care of your AC installation near Bel Air MD.
Over 100 5-Star Reviews
Master H.V.A.C. License# 6626
Master Gas Fitter License# M11296

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.
 
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Address:   613 Eastern Blvd.
Essex, MD 21221
Phone:   (410) 391-3070
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Payment Options
 
For AC repair service in Baltimore MD, we accept most major credit cards.
 
We accept cash for Cooling repair service provided in Joppa MD.
We accept check for Air Conditioner repair service provided in Bel Air MD.
 
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