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Do viewing window dimensions have to be exactly 144 square inches?

April 26, 2017dimensions inches square viewing window

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Do viewing window dimensions have to be exactly 144 square inches?

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No, but they should be at least 144 square inches. The dimensions can be less than that depending on individual circumstances. If they are less, the designer of the room may want to check with our office before installation for an opinion. If you are not sure if you or your employees need to use personal dosimetry, you should have your office evaluated by a Private Inspector .