Camera housing is often divided into two categories termed "indoor housing" and "outdoor housing" which correlate with the amount of protection the housing offers. Obviously, an outdoor housing would offer a higher level of environmental protection than an indoor housing. Indoor housing typically is enough to protect against dust but does not have a built in fan or heater for temperature extremes.
The terms are actually misleading since it refers to the camera housing's capacity to withstand environmental demands rather than where the camera is actually installed. For example, a security camera used to monitor a freezer room would require an outdoor housing that can accommodate the extreme cold.
There are more standard ways to describe the amount of protection provided by camera housing. While there are various standards worldwide, in the United States camera housing use standards set by NEMA, the National Electrical Manufacturers Association.
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