CATEGORY B POSITIVE PRESSURE FIRE DOORS
20 minute (with hose) communicating panel design wood fire door, routed MDF or particle board core type eligible for 45 minute rating when installed in tandem in a listed 45 minute rated communicating frame.
Limitations
Single swing 3'0" x 8'0" maximum size
Must be self-closing and latching, not for use as a means of egress.
Suitable cylindrical locks and closers required.
Evaluated to the following...
This category includes doors evaluated with an edge-sealing system (Category G) field-applied to the labeled frame or door. The application of the edge-sealing system does not require any machining of the frame or door. Please refer to "Category G - Edge-Sealing System" for individual manufacturer's listings.
These assemblies are eligible for use in any "Category C - Standard" frame. These doors may also be installed in frames listed in "Category C - Proprietary" in the accordance with the frame manufacturer's individual listing.
All doors listed in Category B are eligible to bear the "S" (for Smoke & Draft Control assemblies) if a listed "Category H - Smoke & Draft Control Gasket" has been applied to the assembly. Please refer to Category H for individual gasket manufacturer's listings.
All doors in this category are identified by a label or marking bearing the wording, "Listed Fire Door", a time interval, a temperature rise rating, a serial number and the Warnock Hersey Certification Mark and "UBC-7-2-97/UL 10C".
