Yes, two levels would be needed. The lower head under the slatted would need a baffle to prevent the upper head cooling it.
To act as a shield and improve heat collection you could have a 3ft sq of sheet material fitted hard to the upper side of the slats so the lower head is effectively 6in below a 3ft x 3ft ceiling. The lower SSP head would only need the deflector say 1in below the bottom edge of the slats. The only other choice is to lower the slatted ceiling to achieve the clearance required in the Sprinkler Standard so the full spray pattern can develop. I had a similar problem in 5 storied Library with slatted ceilings but had the required clearance except under ducts above the slatted ceiling. Regards, Russell Gregory Christchurch New Zealand From: Sprinklerforum [mailto:[email protected]] On Behalf Of Gregory Lindholm Sent: Wednesday, 29 March 2017 8:31 AM To: [email protected] Subject: 1x6 Slatted Ceiling We have an office that has the grid ceiling at 10'-0", and we have a 8' x 12' area that has 1" x 6" boards as slats (The slats end up being 1x6's, 12' long), that are about 6" apart. The top of the slats are @ 8'-8" (1'-4" below the ceiling). This slatted area is in a 12' x 16' room. I believe that we obviously have to have a normal layout of sprinklers at the grid ceiling, but we would also have to have something below, because the slats would break up any pattern from the ceiling level heads. My 1st assumption would be a level of heads with the deflectors just below the slats, but how would they ever activate, with no way for the heat to collect down to them. This is one that I have never run into. ???? Greg Lindholm
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