Clarification on Notification Issues by Mike Ryan

Not to put too fine a point on it but rather to be precise;

Wall mounted (visible) appliances are to be located (between) 80 inches minimum and 96 inches maximum above the finished floor. (i.e. 80" AFF to the bottom of the lens so that the entire lens is no lower than 80" and no higher than 96" AFF to the top of the lens, so that the entire lens is no higher than 96")

Now if you want to pick a fight consider this;

The mounting criteria for Visible appliances differs significantly from wall mounted Audible appliances, which have a minimum mounting of 90" AFF as measured to the top of the appliance.

You will note, when Combination appliances are mounted so as to satisfy the Audible criteria, (90" AFF top) the appliance remains within the range allowed for both Audible AND visible appliances, but not the other way round.

In other words, where combination appliances (Audible & Visible housed in the same enclosure) are mounted at 80" AFF to the bottom (of the lens) the resulting installation will make the audible too low.

The reasoning stems from the prohibition against mounting an Audible Appliance so low that the resulting SPL would exceed 120dBA at the minimum hearing distance

Mike Ryan - Alarm Express