Certifications and compliances

• ASTM standard E-119
• NFPA 251
• UL classification per UL standard 1479
• NAVSEA approval – Electric Plant Installation Standard Methods No. S9300- AW-EDG-010/EPISM – TWFS/TWBS assemblies

System:

• Few parts required to seal a wide range of diameters of cables or conduits
• Easy and fast installation, using factory assembled components
• High degree of flexibility with interchangeable sealing block assemblies and a selection of different sizes of frames

Mounting frame:

• One-piece cast malleable iron or steel mounting frame can be cast into concrete during wall construction, grouted in masonry surfaces or welded into steel bulkheads at any time
• Retrofit frame allows for easy installation of frame where cables/conduit are already installed
• Available in sizes to accommodate a wide range of cable tray sizes and loadings, including single and multiple layers of cables for power or instrument applications
• Cast keyways in mounting frame align and position sealing block assemblies
• Frames can be installed in wall such that sealing block assemblies can be inserted in either horizontal or vertical position

Sealing block assembly:

• Specially formulated elastomeric material between cast malleable iron pressure plates protects cable from mechanical damage; provides high pull-out resistance and positive cable separation; expands during fire to seal any voids left by burned cable insulation
• Interchangeable sealing block assemblies fit all THRU-WALL BARRIER mounting frames
• Cast stops on front pressure plate prevent sealing block assembly from slipping through mounting frame during installation
• Assemblies are offered for all cable/conduit outside diameters from 0.250” to 4.500” (6.4mm to 114.3mm); cables with diameters less than 0.250” can be accommodated – contact factory
• Sealing block openings will accommodate undersize and out-of-round cable
• Each sealing block assembly seals multiple cables/conduits; compact design permits close nesting of cables, saving space
• Reducers permit sealing block assemblies to accept cables with smaller O.D. than the specified range
• Plugs are used to fill unused openings in sealing block assemblies; blank sealing block assemblies fill unused spaces in mounting frames, providing for future expansion

• Mounting frame – TWF, TWFR: cast malleable iron; TWFS: cast carbon steel, ASTM A27 grade 60-30
• Pressure plate – cast malleable iron
• Sealing material – special elastomeric material
• Clamping hardware – steel