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What is the minimum clearance between two controllers in a small machine room facing each other?

  1. 24 inches

  2. 30 inches

  3. 36 inches

  4. 42 inches

The correct answer is: 36 inches

In a small machine room where two controllers are facing each other, the minimum clearance required between them is typically 36 inches. This clearance allows enough space for proper maintenance, servicing, and operation of the controllers without any obstructions. The other options listed (24 inches, 30 inches, and 42 inches) do not provide adequate separation for safe and convenient access to the controllers in this setup.