STI NEZ33 Smoke and Acoustic Pathway Device 4.5 in Blue

Cable pathway for non-rated assemblies

The STI NEZ33 is a blue thermoplastic device that seals cable penetrations through non-rated walls and floors. Its square body measures 4.5 inches wide and provides a 6.7 square inch loading area for cables or cable trays. Installers working on non-fire-rated barriers use it to maintain a smoke and acoustic seal without a fire rating requirement.

6.7 sq in cable loading area

The single specification that determines fit is the 6.7 square inch cable loading area, which dictates how many conductors or what tray size can pass through. The pathway accepts cable and cable trays in a square opening with an overall height of 5.5 inches and overall length of 4 inches. No fire rating applies, so it cannot be used where a rated assembly is required.

Two inner shells, two outer shells.

The kit ships with two inner shell assemblies, two outer shell assemblies, eight mounting parts, eight screws and labels so the pathway can be assembled and secured on site. All mounting hardware is included, allowing immediate installation on non-rated walls and floors without sourcing separate fasteners. The blue thermoplastic construction resists corrosion in indoor environments.