Overview
The Nelson AA0835P04 is a 4″ intumescent firestop plug engineered to seal cable penetrations, conduit openings, and blank holes in fire-rated walls and floors. The Nelson AA0835P04 plugs are manufactured using intumescent urethane foam that expands when exposed to high temperatures, creating a robust barrier against fire, smoke, and noxious gases. This box contains six individual plugs, making it ideal for facility maintenance, new construction, and retrofit applications where passive fire protection is essential.
Key Features
- Intumescent urethane foam core expands at high temperature to block fire and smoke passage
- Simple installation by compressing and stacking plugs brick-fashion into openings
- Suitable for both temporary overnight installations and permanent long-term seals
- UL-approved firestop solution compliant with fire codes
- No special tools or fasteners required for installation
- Box of 6 units provides ready-to-use inventory
Technical Specifications
- Opening Size: 4″ diameter
- Quantity Per Box: 6 units
- Material: Intumescent urethane foam
- Temperature Activation: High-temperature expansion rated for fire ratings
- Approved Standards: UL Fire Resistance Directory compliant
- Installation Method: Compression-stack (brick-like) assembly
- Application Type: Electrical conduit, cable penetrations, blank openings
Typical Applications
Nelson AA0835P04 firestop plugs are used in:
- Data center and server room cable management penetrations
- Commercial office buildings for electrical and IT conduit sealing
- Industrial facilities protecting power distribution and control circuits
- Emergency sealing of temporary conduit stubs during construction
- Retrofit installations in existing fire-rated wall and floor assemblies
- Telecom and network infrastructure penetration protection
Compatibility & Replacements
Compatible With
- 4″ electrical conduit (rigid, EMT, PVC)
- Cable trays and wire bundles up to 4″ diameter
- Concrete and gypsum fire-rated wall and floor assemblies
- Most standard building code penetration scenarios
- Retrofit and new construction firestop system installations
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering specific replacement models. The AA0835P04 is Nelson’s designated 4″ intumescent plug offering.
Works With
- Nelson firestop sealants and spray products for annulus filling
- Standard fire-rated construction materials (concrete, gypsum board)
- UL-listed firestop system designs
- ASTM E814 (UL 1479) fire-rating compliance protocols
