Jackson & Foster Heating & Air Conditioning

We're Not Comfortable Until You Are

7574 University Ave.
La Mesa, CA 91942
(619) 667-4328

Jackson & Foster Heating & Air Conditioning 7574 University Ave. La Mesa, CA 91942 - Phone: (619) 667-4328

Your Best Choice in Service

Jackson & Foster Heating & Air Conditioning has proudly been servicing San Diego since 1931. We take pride in knowing that each and every one of our customers is completely satisfied and every job is done completely and correctly - the first time. Call (619) 667-4328 to schedule your next appointment with Jackson & Foster Heating & Air Conditioning.

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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 Amer. Conf. of Governmental & Industrial Hygienists ACGIH)
Ceiling (max. value, 15 min.) - 200 ppm (229 mg/cu. m)

MI Occup. Safety & Health Admin. (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.

Am. Soc. of Heating, Refrigeration & Air Cond. Engineers (ASHRAE) -

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

American Gas Association -

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

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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.

7574 University Ave.
La Mesa, CA 91942
(619) 667-4328