The best enviroment for network gear is a cooled and clean rack. In the real world it is many times the opposit warm and dusty. Many vendors advise you to clean the fans on regular bases to prevent poblems with the air based cooling. Most network engineers have seen pretty wild thinks when it comes to not optimal enviroments. I worked in a industrial facility where they had a lot of dust it was nearly everywhere. Really amazing that the modular Avaya Cajun Router and the 2RU Cajun access switch that you can see on the pictures have survived these conditions and worked without any issues for years. All the white powder on the IO board that you can see is industrial dust that nearly covered everything with a thick layer including all the optical components.
Do you also have seen network gear working in ruff conditions, please leave a comment.