This is the place to post questions and discussions on usage and style. The members of the Wordwizard Clubhouse will also often be able to help you to formulate that difficult letter.
I'm not too sure what the machine is called, but the process is called fumigation. A chemical gas or fine mist is sprayed to control insects, bacteria, moulds, viruses, odours. Another common term is "fogging". I might call it a fumigation gun...and I'm sure most folks would know what I was talking about.ACCESS_POST_ACTIONS