If you have a LH or OH criteria where the concealed heads can be used, one method that was approved by one of the big insurers for a similar installation used the TYCO DSB-2 dry sprinkler boot on the sprinkler drop. The boot was placed over the drop and sealed against the upper side of the celling panel. The concealed sprinkler used the gasket option on the room side of the sprinkler.
This method according to the underwriter had been proven to stop any infiltration into the occupied space from the ceiling cavity. But if you have an EH occupancy, then that’s another story. I would highly recommend contacting the owner’s Risk Consultant or Insurance Underwriter or EOR for input or approval on any method proposed. Since this could be a “H” occupancy I do certainly hope there is a qualified engineer involved in the project. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected] From: Sprinklerforum [mailto:[email protected]] On Behalf Of Larrimer, Peter A Sent: Tuesday, October 17, 2017 3:16 PM To: [email protected] Subject: Clean Room Sprinkler Options [EXTERNAL] Can anyone please assist with a recommendation for a “clean room” sprinkler where the clean rooms are designed to be negative pressure (for compounding dangerous drugs). The concealed sprinkler cut sheets that I’ve looked at online generally say that the concealed heads cannot be used in negative pressure rooms (positive pressure plenums) and this is the type of room design that we require. The FlexHead cleanroom ceiling sprinkler connection doesn’t appear to be easy to clean after installation. What type of quick response sprinkler could be used in a negative pressure room that is readily and easily cleanable? Users wanted to used concealed sprinklers as they thought that the concealed sprinklers would be easy to wipe down when necessary, but we don’t want to violate the installation instructions on the cut sheets that state that the concealed sprinklers can’t be used with positive pressure plenums (negative pressure rooms). Thanks in advance. Pete Larrimer VA
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