Refrigerants shall be classified in accordance with ASHRAE 34 as listed in Table 1103.1.

[F] TABLE 1103.1 **REFRIGERANT CLASSIFICATION, AMOUNT AND OEL**

CHEMICAL REFRIGERANT | FORMULA | CHEMICAL NAME OF BLEND | REFRIGERANT CLASSIFICATION | DEGREES OF HAZARD^{a} | [M] AMOUNT OF REFRIGERANT PER OCCUPIED SPACE | |||

Pounds per 1,000 cubic feet | ppm | g/m^{3} | OEL^{e} | |||||

R-11^{d} | CCl_{3 }F | trichlorofluoromethane | A1 | 2-0-0^{b} | 0.39 | 1,100 | 6.2 | C1,000 |

R-12^{d} | CCl_{2 }F_{2 } | dichlorodifluoromethane | A1 | 2-0-0^{b} | 5.6 | 18,000 | 90 | 1,000 |

R-13^{d} | CClF_{3 } | chlorotrifluoromethane | A1 | 2-0-0^{b} | — | — | — | 1,000 |

R-13B1^{d} | CBrF_{3 } | bromotrifluoromethane | A1 | 2-0-0^{b} | — | — | — | 1,000 |

R-14 | CF_{4 } | tetrafluoromethane (carbon tetrafluoride) | A1 | 2-0-0^{b} | 25 | 110,000 | 400 | 1,000 |

R-22 | CHClF_{2 } | chlorodifluoromethane | A1 | 2-0-0^{b} | 13 | 59,000 | 210 | 1,000 |

R-23 | CHF_{3 } | trifluoromethane (fluoroform) | A1 | 2-0-0^{b} | 7.3 | 41,000 | 120 | 1,000 |

R-32 | CH_{2 }F_{2 } | difluoromethane (methylene fluoride) | A2 | — | 4.8 | 36,000 | 77 | 1,000 |

R-113^{d} | CCl_{2 }FCClF_{2 } | 1,1,2-trichloro-1,2,2-trifluoroethane | A1 | 2-0-0^{b} | 1.2 | 2,600 | 20 | 1,000 |

R-114^{d} | CClF_{2 }CClF_{2 } | 1,2-dichloro-1,2,2-tetrafluoroethane | A1 | 2-0-0^{b} | 8.7 | 20,000 | 140 | 1,000 |

R-115 | CClF_{2 }CF_{3 } | chloropentafluoroethane | A1 | — | 47 | 120,000 | 760 | 1,000 |

R-116 | CF_{3 }CF_{3 } | hexafluoroethane | A1 | 1-0-0 | 34 | 97,000 | 550 | 1,000 |

R-123 | CHCl_{2 }CF_{3 } | 2,2-dichloro-1,1,1-trifluoroethane | B1 | 2-0-0^{b} | 3.5 | 9,100 | 57 | 50 |

R-124 | CHClFCF_{3 } | 2-chloro-1,1,1,2-tetrafluoroethane | A1 | 2-0-0^{b} | 3.5 | 10,000 | 56 | 1,000 |

R-125 | CHF_{2 }CF_{3 } | pentafluoroethane | A1 | 2-0-0^{b} | 23 | 75,000 | 370 | 1,000 |

R-134a | CH_{2 }FCF_{3 } | 1,1,1,2-tetrafluoroethane | A1 | 2-0-0^{b} | 13 | 50,000 | 210 | 1,000 |

R-141b | CH_{3 }CCl_{2 }F | 1,1-dichloro-1-fluoroethane | — | — | 0.78 | 2,600 | 12 | 500 |

R-142b | CH_{3 }CClF_{2 } | 1-chloro-1,1-difluoroethane | A2 | — | 5.1 | 20,000 | 83 | 1,000 |

R-143a | CH_{3 }CF_{3 } | 1,1,1-trifluoroethane | A2 | 2-0-0^{b} | 4.5 | 21,000 | 70 | 1,000 |

R-152a | CH_{3 }CHF_{2 } | 1,1-difluorethane | A2 | 1-4-0 | 2 | 12,000 | 32 | 1,000 |

R-170 | CH_{3}CH_{3} | ethane | A3 | 2-4-0 | 0.54 | 7,000 | 8.7 | 1,000 |

R-E170 | CH_{3 }OCH_{3 } | Methoxymethane (dimethyl ether) | A3 | — | 1 | 8,500 | 16 | 1,000 |

R-218 | CF_{3 }CF_{2 }CF_{3 } | octafluoropropane | A1 | 2-0-0^{b} | 43 | 90,000 | 690 | 1,000 |

R-227ea | CF_{3 }CHFCF_{3 } | 1,1,1,2,3,3,3-heptafluoropropane | A1 | — | 36 | 84,000 | 580 | 1,000 |

R-236fa | CF_{3 }CH_{2 }CF_{3 } | 1,1,1,3,3,3-hexafluoropropane | A1 | 2-0-0^{b} | 21 | 55,000 | 340 | 1,000 |

R-245fa | CHF_{2 }CH_{2 }CF_{3 } | 1,1,1,3,3-pentafluoropropane | B1 | 2-0-0^{b} | 12 | 34,000 | 190 | 300 |

R-290 | CH_{3 }CH_{2 }CH_{3 } | propane | A3 | 2-4-0 | 0.56 | 5,300 | 9.5 | 1,000 |

R-C318 | -(CF_{2 })_{4 }- | octafluorocyclobutane | A1 | — | 41 | 80,000 | 660 | 1,000 |

*(continued)*

[F] TABLE 1103.1—continued

REFRIGERANT CLASSIFICATION, AMOUNT AND OEL

CHEMICAL REFRIGERANT | FORMULA | CHEMICAL NAME OF BLEND | REFRIGERANT CLASSIFICATION | DEGREES OF HAZARD^{a} | [M] AMOUNT OF REFRIGERANT PER OCCUPIED SPACE | |||

Pounds per 1,000 cubic feet | ppm | g/m^{3} | OEL^{e} | |||||

R400^{d} | zeotrope | R-12/114 (50/50) | A1 | 2-0-0^{b} | 10 | 28,000 | 160 | 1,000 |

R-400^{d} | zeotrope | R-12/114 (60/40) | A1 | 11 | 30,000 | 170 | 1,000 | |

R-401A | zeotrope | R-22/152a/124 (53/13/34) | A1 | 2-0-0^{b} | 6.6 | 27,000 | 110 | 1,000 |

R-401B | zeotrope | R-22/152a/124 (61/11/28) | A1 | 2-0-0^{b} | 7.2 | 30,000 | 120 | 1,000 |

R-401C | zeotrope | R-22/152a/124 (33/15/52) | A1 | 2-0-0^{b} | 5.2 | 20,000 | 84 | 1,000 |

R-402A | zeotrope | R-125/290/22 (60/2/38) | A1 | 2-0-0^{b} | 8.5 | 33,000 | 140 | 1,000 |

R-402B | zeotrope | R-125/290/22 (38/2/60) | A1 | 2-0-0^{b} | 15 | 63,000 | 240 | 1,000 |

R-403A | zeotrope | R-290/22/218 (5.0/75.0/20.0) | A2 | 2-0-0^{b} | 7.6 | 33,000 | 120 | 1,000 |

R-403B | zeotrope | R-290/22/218 (5/56/39) | A1 | 2-0-0^{b} | 18 | 70,000 | 290 | 1,000 |

R-404A | zeotrope | R-125/143a/134a (44/52/4) | A1 | 2-0-0^{b} | 31 | 130,000 | 500 | 1,000 |

R-405A | zeotrope | R-22/152a/142b/C318 (45.0/7.0/5.5/2.5) | — | — | 16 | 57,000 | 260 | 1,000 |

R-406A | zeotrope | R-22/600a/142b (55/4/41) | A2 | — | 4.7 | 21,000 | 25 | 1,000 |

R-407A | zeotrope | R-32/125/134a (20/40/40) | A1 | 2-0-0^{b} | 18 | 78,000 | 290 | 1,000 |

R-407B | zeotrope | R-32/125/134a (10/70/20) | A1 | 2-0-0^{b} | 20 | 77,000 | 320 | 1,000 |

R-407C | zeotrope | R-32/125/134a (23/25/52) | A1 | 2-0-0^{b} | 17 | 76,000 | 270 | 1,000 |

R-407D | zeotrope | R-32/125/134a (15/15/70) | A1 | 2-0-0^{b} | 15 | 65,000 | 240 | 1,000 |

R-407E | zeotrope | R-32/125/134a (25/15/60) | A1 | 2-0-0^{b} | 16 | 75,000 | 260 | 1,000 |

R-408A | zeotrope | R-125/143a/22 (7/46/47) | A1 | 2-0-0^{b} | 21 | 95,000 | 340 | 1,000 |

R-409A | zeotrope | R-22/124/142b (60/25/15) | A1 | 2-0-0^{b} | 7.1 | 29,000 | 110 | 1,000 |

R-409B | zeotrope | R-22/124/142b (65/25/10) | A1 | 2-0-0^{b} | 7.3 | 30,000 | 120 | 1,000 |

R-410A | zeotrope | R-32/125 (50/50) | A1 | 2-0-0^{b} | 25 | 130,000 | 390 | 1,000 |

R-410B | zeotrope | R-32/125 (45/55) | A1 | 2-0-0^{b} | 24 | 130,000 | 390 | 1,000 |

R-411A | zeotrope | R-127/22/152a (1.5/87.5/11.0) | A2 | — | 2.9 | 14,000 | 46 | 990 |

R-411B | zeotrope | R-1270/22/152a (3/94/3) | A2 | — | 2.8 | 13,000 | 45 | 980 |

R-412A | zeotrope | R-22/318/142b (70/5/25) | A2 | — | 5.1 | 22,000 | 82 | 1,000 |

R-413A | zeotrope | R-218/134a/600a (9/88/3) | A2 | — | 5.8 | 22,000 | 94 | 1,000 |

R-414A | zeotrope | R-22/124/600a/142b (51/28.5/4/16.5) | A1 | — | 6.4 | 26,000 | 100 | 1,000 |

R-414B | zeotrope | R-22/124/600a/142b (50/39/1.5/9.5) | A1 | — | 6 | 23,000 | 95 | 1,000 |

*(continued)*

[F] TABLE 1103.1—continued

REFRIGERANT CLASSIFICATION, AMOUNT AND OEL

CHEMICAL REFRIGERANT | FORMULA | CHEMICAL NAME OF BLEND | REFRIGERANT CLASSIFICATION | DEGREES OF HAZARD^{a} | [M] AMOUNT OF REFRIGERANT PER OCCUPIED SPACE | |||

Pounds per 1,000 cubic feet | ppm | g/m^{3} | OEL^{e} | |||||

R-415A | zeotrope | R-22/152a (82.0/18.0) | A2 | — | 12 | 57,000 | 190 | 1,000 |

R-415B | zeotrope | R-22/152a (25.0/75.0) | A2 | — | 9.3 | 52,000 | 120 | 1,000 |

R-416A | zeotrope | R-134a/124/600 (59/39.5/1.5) | A1 | 2-0-0^{b} | 3.9 | 14,000 | 62 | 1,000 |

R-417A | zeotrope | R-125/134a/600 | A1 | 2-0-0^{b} | 3.5 | 13,000 | 56 | 1,000 |

R-418A | zeotrope | R-290/22/152a (1.5/96.0/2.5) | A2 | — | 13 | 59,000 | 200 | 1,000 |

R-419A | zeotrope | R-125/134a/E170 (77.0/19.0/4.0) | A2 | — | 19 | 70,000 | 310 | 1,000 |

R-420A | zeotrope | R-134a/142b (88.0/0) | A1 | 2-0-0^{b} | 12 | 45,000 | 190 | 1,000 |

R-421A | zeotrope | R-125/134a (58.0/42.0) | A1 | 2-0-0^{b} | 17 | 61,000 | 280 | 1,000 |

R-421B | zeotrope | R-125/134a (85.0/15.0) | A1 | 2-0-0^{b} | 21 | 69,000 | 330 | 1,000 |

R-422A | zeotrope | R-125/134a/600a (85.1/11.5/3.4) | A1 | 2-0-0^{b} | 18 | 63,000 | 290 | 1,000 |

R-422B | zeotrope | R-125/134a/600a (55.0/42.0/3.0) | A1 | 2-0-0^{b} | 16 | 26,000 | 250 | 1,000 |

R-422C | zeotrope | R-125/134a/600a (82.0/15.0/3.0) | A1 | 2-0-0^{b} | 18 | 62,000 | 290 | 1,000 |

R-422D | zeotrope | R-125/134a/600a (65.1/31.5/3.4) | A1 | 2-0-0^{b} | 16 | 58,000 | 260 | 1,000 |

R-423A | zeotrope | R-134a/227ea (52.5/47.5) | A1 | 2-0-0^{c} | 19 | 59,000 | 310 | 1,000 |

R-424A | zeotrope | R-125/134a/600a/600/601a (50.5/47.0/1.0/0.6) | A1 | 2-0-0^{b} | 6.2 | 23,000 | 100 | 970 |

R-425A | zoetrope | R-32/134a/227ea (18.5/69.5/0) | A1 | 2-0-0^{b} | 16 | 67,000 | 250 | 1,000 |

R-426A | zeotrope | R-125/134a/600a/601a (5.1/93.0/1.3/0.6) | A1 | — | 5.2 | 20,000 | 83 | 990 |

R-427A | zeotrope | R-32/125/143a/134a (15.0/25.0/10.0/50.0) | A1 | — | 18 | 76,000 | 280 | 1,000 |

R-428A | zeotrope | R-125/143a/290/600a (77.5/20.0/0.6/1.9) | A1 | — | 23 | 83,000 | 370 | 1,000 |

R-429A | zeotrope | R-E170/152a/600a (60.0/10.0/30.0) | A3 | — | 0.81 | 6,300 | 13 | 1,000 |

R-430A | zeotrope | R-152a/600a (76.0/24.0) | A3 | — | 1.3 | 8,000 | 21 | 1,000 |

R-431A | zeotrope | R-290/152a (71.0/29.0) | A3 | — | 0.69 | 5,500 | 11 | 1,000 |

R-432A | zeotrope | R-1270/E170 (80.0/20.0) | A3 | — | 0.13 | 1,200 | 2.1 | 710 |

R-433A | zeotrope | R-1270/290 (30.0/70.0) | A3 | — | 0.34 | 3,100 | 5.5 | 880 |

R-433B | zeotrope | R-1270/290 (5.0-95.0) | A3 | — | 0.51 | 4,500 | 8.1 | 950 |

R-433C | zeotrope | R-1270/290 (25.0-75.0) | A3 | — | 0.41 | 3,600 | 6.6 | 790 |

R-434A | zeotrope | R-125/143a/600a (63.2/18.0/16.0/2.8) | A1 | — | 20 | 73,000 | 320 | 1,000 |

R-435A | zeotrope | R-E170/152a (80.0/20.0) | A3 | — | 1.1 | 8,500 | 17 | 1,000 |

R-436A | zeotrope | R-290/600a (56.0/44.0) | A3 | — | 0.5 | 4,000 | 8 | 1,000 |

R-436B | zeotrope | R-290/600a (52.0/48.0) | A3 | — | 0.5 | 4,000 | 8 | 1,000 |

R-437A | zeotrope | R-125/134a/600/601 (19.5/78.5/1.4/0.6) | A1 | — | 5 | 19,000 | 81 | 990 |

R-438A | zeotrope | R-32/125/134a/600/601a (8.5/45.0/44.2/1.7/0.6) | A1 | 4.9 | 19,000 | 79 | 990 |

*(continued)*

[F] TABLE 1103.1—continued

REFRIGERANT CLASSIFICATION, AMOUNT AND OEL

CHEMICAL REFRIGERANT | FORMULA | CHEMICAL NAME OF BLEND | REFRIGERANT CLASSIFICATION | DEGREES OF HAZARD^{a} | [M] AMOUNT OF REFRIGERANT PER OCCUPIED SPACE | |||

Pounds per 1,000 cubic feet | ppm | g/m^{3} | OEL^{e} | |||||

R-500^{e} | azeotrope | R-12/152a (73.8/26.2) | A1 | 2-0-0^{b} | 7.6 | 30,000 | 120 | 1,000 |

R-501^{d} | azeotrope | R-22/12 (75.0/25.0) | A1 | — | 13 | 54,000 | 210 | 1,000 |

R-502^{e} | azeotrope | R-22/115 (48.8/51.2) | A1 | 2-0-0^{b} | 21 | 73,000 | 330 | 1,000 |

R-503^{e} | azeotrope | R-23/13 (40.1/59.9) | — | 2-0-0^{b} | — | — | — | 1,000 |

R-504^{d} | azeotrope | R-32/115 (48.2/51.8) | — | — | 29 | 140,000 | 460 | 1,000 |

R-507A | azeotrope | R-125/143a (50/50) | A1 | 2-0-0^{b} | 32 | 130,000 | 520 | 1,000 |

R-508A | azeotrope | R-23/116 (39/61) | A1 | 2-0-0^{b} | 14 | 55,000 | 220 | 1,000 |

R-508B | azeotrope | R-23/116 (46/54) | A1 | 2-0-0^{b} | 13 | 52,000 | 200 | 1,000 |

R-509A | azeotrope | R-22/218 (44/56) | A1 | 2-0-0^{b} | 24 | 75,000 | 390 | 1,000 |

R-510A | azeotrope | R-E170/600a (88.0/0) | A3 | — | 0.87 | 7,300 | 14 | 1,000 |

R-600 | CH_{3 }CH_{2 }CH_{2 }CH_{3 } | butane | A3 | 1-4-0 | 0.1 | 1,000 | 2.4 | 1,000 |

R-600a | CH(CH_{3 })_{2 }-CH_{3 } | 2-methylpropane (isobutane) | A3 | 2-4-0 | 0.6 | 4,000 | 9.6 | 1,000 |

R-601 | CH_{3 }CH_{2 }CH_{2 }CH_{2 }CH_{3 } | pentane | A3 | — | 0.2 | 1,000 | 2.9 | 600 |

R-601a | (CH_{3 })_{2 }CHCH_{2 }CH_{3 } | 2-methylbutane (isopentane) | A3 | — | 0.2 | 1,000 | 2.9 | 600 |

R-717 | NH_{3 } | ammonia | B2 | 3-3-0^{c} | 0.014 | 320 | 0.22 | 25 |

R-718 | H_{2 }O | water | A1 | 0-0-0 | — | — | — | — |

R-744 | CO_{2 } | carbon dioxide | A1 | 2-0-0^{b} | 4.5 | 40,000 | 72 | 5,000 |

R-1150 | CH_{2 }=CH_{2 } | ethene (ethylene) | A3 | 1-4-2 | — | — | — | 200 |

R-1234yf | CF3 CF=CH 2 | 2,3,3,3-tetrafluoro-1 propene | A2 | — | 4.7 | 16,000 | 75 | 500 |

R-1270 | CH_{3 }CH=CH_{2 } | Propene (propylene) | A3 | 1-4-1 | 0.1 | 1,000 | 1.7 | 500 |

^{3}.

Locations of refrigerating systems are described by *occupancy *classifications that consider the ability of people to respond to potential exposure to refrigerants. Where *equipment *or appliances, other than piping, are located outside a building and within 20 feet (6096 mm) of any building opening, such *equipment *or appliances shall be governed by the *occupancy *classification of the building. *Occupancy *classifications shall be defined as follows:

- Institutional
*occupancy*is that portion of premises from which, because they are disabled, debilitated or confined, occupants cannot readily leave without the assistance of others. Institutional occupancies include, among others, hospitals, nursing homes, asylums and spaces containing locked cells. - Public assembly
*occupancy*is that portion of premises where large numbers of people congregate and from which occupants cannot quickly vacate the space. Public assembly occupancies include, among others, auditoriums, ballrooms, classrooms, passenger depots, restaurants and theaters. - Residential
*occupancy*is that portion of premises that provides the occupants with complete independent living facilities, including permanent provisions for living, sleeping, eating, cooking and sanitation. Residential occupancies include, among others, dormitories, hotels, multiunit apartments and private residences. - Commercial
*occupancy*is that portion of premises where people transact business, receive personal service or purchase food and other goods. Commercial occupancies include, among others, office and professional buildings, markets (but not large mercantile occupancies) and work or storage areas that do not qualify as industrial occupancies. - Large mercantile
*occupancy*is that portion of premises where more than 100 persons congregate on levels above or below street level to purchase personal merchandise. - Industrial
*occupancy*is that portion of premises that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process or store goods such as chemicals, food, ice, meat or petroleum. - Mixed
*occupancy*occurs when two or more occupancies are located within the same building. When each*occupancy*is isolated from the rest of the building by tight walls, floors and ceilings and by self-closing doors, the requirements for each*occupancy*shall apply to its portion of the building. When the various occupancies are not so isolated, the*occupancy*having the most stringent requirements shall be the governing*occupancy*.

Direct systems and indirect open-spray systems shall be classified as high probability systems.

**Exception: **An indirect open-spray system shall not be required to be classified as a high-probability system if the pressure of the secondary coolant is at all times (operating and standby) greater than the pressure of the refrigerant.