BlazeMasterR CPVC can now be installed in sprinklered combustible concealed open wood truss construction when the space is protected by a model CC1 sprinkler head from Central Sprinkler. The combination of the CC1 sprinkler head and BlazeMasterR CPVC can be installed combustible concealed spaces requiring fire sprinkler protection in accordance with NFPA 13 and 13R sprinkler standards. Previously, BlazeMasterR could be installed in combustible concealed spaces only if they did not require sprinkler protection.