When it comes to purchasing a fog cannon security system, it is important to consider the size of the area that needs to be covered. Different models of fog machines have varying fog outputs, and choosing the right one will depend on the size of the space you need to secure. It is recommended to get a machine that can produce a thick and dense fog, particularly for larger areas, in order to fully obstruct intruders from seeing inside. If there are gaps in coverage, then the security provided may be compromised. Investing in a fog cannon security system of adequate size ensures optimal protection against potential security threats.