Abstract: A universal surface flush junction box which provides an improved way to transition from in-wall wiring to surface (out of wall) wiring in a building, which requires no additional mounting brackets or conduit bends, which thereby allows for a one trip complete rough-in installation and greatly reduces the amount of sealant required for smoke, fire and acoustical seal.

Abstract: A method of separating HF from a mixture including HF and HCl is disclosed wherein the mixture is contacted with silica causing the HF to react with the silica to form SiF.sub.4. The concentration of HCl is increased thereby increasing the relative volatility of SiF.sub.4 /HCl. The SiF.sub.4 is then removed as an aqueous distillate. The concentration of the HCl can be increased by various methods including adding gaseous or concentrated HCl to the mixture or by distilling off a portion of the water to thereby increase the concentration of the HCl. This method provides an efficient method of removing SiF.sub.4 and HF from HCl.

Abstract: A process is described for reacting chlorinated hydrocarbons other than carbon tetrachloride with metal oxides so as to convert essentially all of the carbon atoms to oxides of carbon. This process provides an efficient and economical means for utilizing chlorinated hydrocarbons.