Scot, I think there are some interesting aspects to this question without too much analysis of occupancy, type of operation, etc-- in other words, straight from 13, but with a little extra thought. The job I mentioned in the earlier post was an auditorium with a full compliment below the roof deck. There were some ceiling clouds for acoustical reasons at various elevations and various slopes. I think they were 16x16. (if they were 20x20, with any slope, and we spaced based on slope, it would exceed 20). As you say, no E.C. listed for greater than 2 in 12 Ceiling slope, BUT!: I think that listing pertains to the single compliment of heads at the Main Ceiling, which is the point of transition from mostly vertical to mostly horizontal heat flow. A fire would have to be under the cloud for the head in it to activate. In fact, the head would activate even if the cloud was straight up and down, if the fire was directly below it, I think. It just strikes me that, at first thought, a 16x16 cloud at 2+ in 12 would require 4 heads instead of 1. I appreciate your input.
ps-- ceiling clouds, being an obstruction, project a foot print on the floor. if a 20x20 cloud sloped enough, that footprint would not exceed 48", so not even 1 head required! :) Brad _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
