StacksVerified U.S. regulatory reference

42 CFR Tables to Subpart I of Part 84

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
Canister typeTest conditionTest atmosphereNumber of testsMaximum allowable penetratin (parts per million)Minimum service life (minutes) 1
Gas or vaporConcentration (parts per million)Flow rate (liters per minute)
Acid gasAs receivedSO220,000643 | 5 | 12
EquilibratedCl220,000643 | 5 | 12
SO220,000324 | 5 | 12
Cl220,000324 | 5 | 12
Organic vaporAs receivedCCl420,000643 | 5 | 12
EquilibratedCCl420,000324 | 5 | 12
AmmoniaAs receivedNH330,000643 | 50 | 12
EquilibratedNH330,000324 | 50 | 12
Carbon monoxideAs receivedCO20,0004 642 | (3) | 60
EquilibratedCO5,0002 323 | (3) | 60
CO3,0002 323 | (3) | 60
Combination of 2 or 3 of above types 5 | |
Combination of all above types 6 | |

1 Minimum life will be determined at the indicated penetration.

2 Relative humidity of test atmosphere will be 95 ±3pct; temperature of test atmosphere will be 25 ±2.5 °C.

3 Maximum allowable CO penetration will be 385 cm 3 during the minimum life. The penetration shall not exceed 500 p/m during this time.

4 Relative humidity of test atmosphere will be 95 ±3pct; temperature of test atmosphere entering the test fixture will be 0 ±2.5 °C−0 °C.

5 Test conditions and requirements will be applicable as shown in this table.

6 Test conditions and requirements will be applicable as shown in this table, except the minimum service lives for acid gas, organic vapor, and ammonia will be 6 min instead of 12 min.

Canister typeTest conditionTest atmosphereNumber of testsMaximum allowable penetration (parts per million)Minimum service life (minutes) 1
Gas or vaporConcentration (parts per million)Flow rate (liters per minute)
Acid gasAs received EquilibratedSO250,000643 | 5 | 12
Cl25,000643 | 5 | 12
SO25,000324 | 5 | 12
Cl25,000324 | 5 | 12
Organic vaporAs received EquilibratedCCl45,000643 | 5 | 12
CCl45,000324 | 5 | 12
AmmoniaAs received EquilibratedNH35,000643 | 50 | 12
As received EquilibratedNH35,000324 | 50 | 12
Carbon monoxideAs receivedCO20,0002 642 | (3) | 60
CO5,0004 323 | (3) | 60
CO3,0002 323 | (3) | 60
Combination of 2 or 3 of above types 5 | |
Combination of all above types 6 | |

1 Minimum life will be determined at the indicated penetration.

2 Relative humidity of test atmosphere will be 95 ±3pct; temperature of test atmosphere will be 25 ±2.5 °C.

3 Maximum allowable CO penetration will be 385 cm 3 during the minimum life. The penetration shall not exceed 500 p/m during this time.

4 Relative humidity of test atmosphere will be 95 ±3pct; temperature of test atmosphere entering the test fixture will be 0 ±2.5 °C−0 °C.

5 Test conditions and requirements will be applicable as shown in this table.

6 Test conditions and requirements will be applicable as shown in this table, except the minimum service lives for acid gas, organic vapor, and ammonia will be 6 min instead of 12 min.

Canister typeTest conditionTest atmosphereNumber of testsMaximum allowable penetration (parts per million)Minimum service life (minutes) 1
Gas or vaporConcentration (parts per million)Flow rate (liters per minute)
Acid gasAs receivedSO25,000643 | 5 | 12
EquilibratedCl25,000643 | 5 | 12
SO25,000324 | 5 | 12
Cl25,000324 | 5 | 12
Organic vaporAs receivedCCl45,000643 | 5 | 12
EquilibratedCCl45,000324 | 5 | 12
AmmoniaAs receivedNH35,000643 | 50 | 12
EquilibratedNH35,000324 | 50 | 12
Carbon monoxideAs receivedCO10,0002 322 | (3) | 4 60
CO5,0005 323 | (3) | 60
CO3,0002 323 | (3) | 60

1 Minimum life will be determined at the indicated penetration.

2 Relative humidity of test atmosphere will be 95 ±3 pct; temperature of test atmosphere will be 25 ±2.5 °C.

3 Maximum allowable CO penetration will be 385 cm 3 during the minimum life. The penetration shall not exceed 500 p/m during this time.

4 If effluent temperature exceeds 100 °C during this test, the escape gas mask shall be equipped with an effective heat exchanger.

5 Relative humidity of test atmosphere will be 95 ±3 pct; temperature of test atmosphere entering the test fixture will be 0 ±2.5 °C−0 °C.