ASHRAE Technical Committee 3.4

Meetings Information

Chicago Meeting, January 2018

Registration now open:


New ASHRAE-Classified Refrigerants To Meet Society’s Changing Needs (Code 64)

Jan 21, 2018 
Sunday, 3:30 - 6:30 pm
Course will take place at McCormick Place 

Instructor(s): Thomas Leck, Ph.D, P.E. , Member ASHRAE 
Non-Member Price: 
$184, after January 2, 2018, $214
ASHRAE Member Price: $139, after January 2, 2018, $169

ASHRAE Standard 34 maintains a list of refrigerants with a standardized system of assigned refrigerant numbers and well defined safety classifications, including toxicity and flammability ratings.  This ever growing list of refrigerants currently includes 161 chemicals and chemical blends that have been proposed for use as refrigerants.

There has long been use of flammable and toxic materials as refrigerants, such as propane and ammonia, but their use has been restricted to appropriately design industrial systems, as proscribed in ASHRAE Standard 15 and other safe use guidelines.  Presently, concern about global climate change is driving the cooling industry to consider new classes of chemicals to be used as refrigerants.  With the new chemicals are new safety classifications for flammability, including “Class 2L”. 

This short course explains how the changing needs of society are creating requirements for new refrigerants to be developed and used.  The course also explains the new safety classifications that are being proposed and some of the ramifications of these new classifications.


Attend a Committee Meeting

ALL ASHRAE committee meetings, including this TC’s meetings at the Winter and Annual Society conferences, are open to the public at no cost nor is conference registration required. Interested visitors, local chapter members, and potential new TC members are always welcome. However to attend technical program sessions sponsored by the TC will require registration and payment of any applicable fee.

Participation in an ASHRAE TC provides the opportunity to grow professionally and to contribute to the advancement of HVAC&R within an international organization recognized for shaping the future of the built environment through research, standards writing, publishing, and education.