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if I was using Ether the LEL is 1.9%. ....in a room with a volume of 500m3 how would I calculate the %LEL for that volume?

From the MSDS :TWA 400ppm (1210 mg/m3), STEL 500 ppm (1520 mg/m3), lower explosion limit 1.9%. S.G 0.71...The lower explosion limit of 1.9% is equivalent to a concentration of 23.3 gm/m3 so explosion is not a hazard.(The molecular weight of air approximates to 30 so a cubic metre of air weighs 1000 1230------- x30 =1230 gm so 1.9% represents a concentration of ------ x 1.924.4 100= 23.3 gm/m3 )There is however an ignition hazard from a source such as flame, sparks or even static electricity.