HFO Refrigerants. HFO (hydrofluoro-olefin) refrigerants are the fourth generation of fluorine-based refrigerants. HFC refrigerants are composed of hydrogen, fluorine and carbon atoms connected by single bonds between the atoms.
Quarter means one year divided by 4 (quartering thâ¦e year) Some companies have fiscal year not calendar year quarters. In this case, find out what is their year end date. For example, if it's fiscal year end on May 31, the first Q starts June 1 to August 31, and so on.
Terms & School Hours in the Us. The school year usually runs from early September until May or June (nine months) and is divided into âquartersâ or terms (semesters). Some schools use the quarter system, which comprises three sessions: fall (September to December), winter (January to March) and spring (March to May or June).