Alarms are mandatory now on radon systems Tony, I wasn't trying to denigrate the hard work of the committee, or comment with it's superior or inferior to other standards groups. I have great deal of respect for the work being done. My point is that unlike any other licensed states, that I'm aware of, Minnesota, directly incorporates by law the AASRT/ANSI standards which in fact make it the "law" of the land here. The current MDH rules compel them to use and enforce the standard without exception. Unlike MDH, DOLA, our building officials, have discretion to which ICC codes to incorporate, enforce or change regardless of their process and who get's to vote on them. Bottom line, if the ANSI/AARST standard says we have to wear purple socks, purple socks it is. Same goes for alarms.