the following precautions will help you plan an acceptable operating environment for your router and will help you avoid environmentally caused equipment failures:

    . ensure that the room where your router operates has adequate circulation. electrical equipment generates heat. without adequate circulation, ambient air temperature may not cool equipment to acceptable operating temperatures.

    . always follow esd-prevention procedures described in the "preventing electrostatic discharge damage" section on page 2-2 to avoid damage to equipment. damage from static discharge can cause immediate or intermittent equipment failure.

    . ensure that the chassis cover or mainboard tray and module rear panels are secure. all empty network module slots, wan interface card slots, and power supply bays (in the cisco 3660 router) must have filler panels installed. the chassis is designed to allow cooling air to flow within it, through specially designed cooling slots. a chassis with uncovered openings will create air leaks, which may interrupt and reduce the flow of air across internal components.