Interpretation Response #21-0011
Below is the interpretation response detail and a list of regulations sections applicable to this response.
Interpretation Response Details
Response Publish Date:
Company Name: Air-Conditioning, Heating, and Refrigeration Institute (AHRI)
Individual Name: Helen Walter-Terrinoni
Location State: VA Country: US
View the Interpretation Document
Response text:
April 13, 2021
Helen Walter-Terrinoni
VP Regulatory Affairs
Air-Conditioning, Heating, and Refrigeration Institute (AHRI)
2311 Wilson Boulevard Suite 400
Arlington, VA 22201
Reference No. 21-0011
Dear Ms. Walter-Terrinoni:
This letter is in response to your February 4, 2021, email requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to exceptions for compressed gases in refrigerating machines and their components. Specifically, you ask questions regarding the exceptions provided in §§ 173.307(a)(4)(iii) and (v).
We have paraphrased and answered your questions as follows:
Q1. You ask whether the exception provided in § 173.307(a)(4)(iii) would apply to refrigerating machines containing 12 kg or less of a flammable, non-toxic liquefied gas, such as "UN3252, Difluoromethane, 2.1" or “UN3161, Liquefied gas, flammable, n.o.s., 2.1,” so long as such units are not offered or transported by air.
A1. The answer is yes. Refrigerating machines and components thereof, containing 12 kg or less of a flammable, non-toxic gas, including a liquefied gas, are not subject to the requirements of the HMR provided they are not offered or transported by aircraft.
Q2. You ask whether the exception provided in § 173.307(a)(4)(v) would apply to refrigerating machines containing 100 g or less of a flammable, non-toxic liquefied gas, such as "UN3252, Difluoromethane, 2.1" or "UN3161, Liquefied gas, flammable, n.o.s., 2.1," regardless of the mode of transportation.
A2. The answer is yes. Refrigerating machines and components thereof, containing 100 g or less of a flammable, non-toxic liquefied gas, are not subject to the requirements of the HMR, regardless of the mode of transportation.
I hope this information is helpful. Please contact us if we can be of further assistance.
Sincerely,
Dirk Der Kinderen
Chief, Standards Development Branch
Standards and Rulemaking Division
173.307(a)(4)(iii), 173.307(a)(4)(iii)(v), 173.307(a)(4)(v)
Regulation Sections
| Section | Subject |
|---|---|
| 173.307 | Exceptions for compressed gases |