Heat pump the brand name Freon, a trademark of DuPont. Its manufacture is now banned or severely restricted by the Montreal Protocol of August 1987 because of the damage that CFCs cause to the ozone layer if released into the atmosphere. One widely adopted replacement refrigerant is the hydrofluorocarbon (HFC) known as R-134a (1,1,1,2-tetrafluoroethane). Heat pumps using R-134a replaced R-12 (dichlorodifluoromethane) and have similar thermodynamic properties but with insignificant ozone depletion potential and a somewhat lower global warming potential. Other substances such as liquid R-717 ammonia are widely used in large-scale systems, or occasionally the less corrosive but more flammable propane or
1987 Montreal Alouettes season crowds in its final year. Consequently, the Winnipeg Blue Bombers moved to the East Division to balance out the divisions and played the Argonauts that day instead. The team never played a single game at Olympic Stadium in 1987; both of their preseason games prior to their folding were played on the road (their first preseason game was moved from Olympic Stadium to Canada Games Stadium in Saint John, New Brunswick). 1987 Montreal Alouettes season The 1987 Montreal Alouettes played two preseason games before folding on June 24, 1987, just one day before their scheduled Thursday game against the Toronto