What types of environment is needed for laboratory?

Laboratory is an important place where the experiments are done for the development of human beings. Different chemicals are used in the laboratory in each experiment. Among these, some are poisonous, explosive, flammable etc. To carry out the experiment without any accident we have to ensure the environment of laboratory to be better. The position of the laboratory should be in a better open place, where enough light and air are available. For this reason enough doors and windows are required so that the normal condition are found in the laboratory.