Abstract: A safe electrolyte which comprises a liquefied gas solvent that will transition from a liquid state to a gas state (“gas off”) at a pressure of 100 kPa and temperature of 293.15 K is further disclosed. A first mixture is formed from a first electrolyte component (one or more solvents) mixed with a second electrolyte component (one or more hydrocarbon co-solvents). The addition of the second electrolyte component (1) lowers the vapor pressure of the first mixture by at least 10% as compared to the vapor pressure of the first electrolyte component alone when measured at 293.15 K and (2) results in a vapor pressure of the first mixture above 100 kPa at a temperature of 293.15 K. The second electrolyte component may also be selected to lower the global warming potential (GWP) of the first mixture by at least 10% as compared to GWP of the first electrolyte component alone. The safe liquefied gas electrolyte is formed by mixing a third electrolyte component (one or more salts) to the first mixture.

Abstract: A HVAC filter frame assembly includes a frame that is positioned in a return air duct of an HVAC system. A pair of rails is each coupled to the frame. A vent is hingedly coupled to the frame and the vent is positionable in between an open position and a closed position. A pair of supports is each hingedly coupled between the frame and the vent. Each of the supports restricts motion of the vent when the vent is opened to retain the vent at a maximum angle with the frame. A filter is positionable between the vent and the rails for filtering air passing through the vent and into the return air duct. The filter is removable when the vent is positioned in the open position. Moreover, each of the supports ranges motion of the vent thereby inhibiting the filter from falling outwardly from the return air duct when the vent is opened. Thus, the filter is inhibited from striking a user when the filter is being changed.