New to all this and about to start blasting on the weekends. So much great and eye-opening info on this site. My question is should I invest in a CO monitor? Is it an OSHA requirement. I will be using a 3 cuft pot and rental 185. If OSHA requires then I'd like to get the Clemco in-helmet monitor but I'm told it isn't certified as on fit in a Nove 3, only in an Apollo. Advice please?