Holdrite HFEXT81 Firestop Sleeve Extension 1 in 8 in

Product Description

The HOLDRITE HFEXT81 is a 1-inch high extension designed for use with 8-inch cast-in-place firestop sleeves. It is part of the HydroFlame Pro Series firestop system, which provides protection against the spread of fire, smoke, and gases while also sealing against unwanted water intrusion. This extension is installed by plumbing and mechanical contractors working on multi-story commercial or mixed-use construction where cast-in-place concrete floor penetrations require UL listed firestop assemblies. The HFEXT81 accommodates the telescoping sleeve design of the HydroFlame Pro Series, maintaining system integrity without requiring field-cut modifications.

This extension is suited for commercial and multi-family residential construction projects where concrete floor-slab penetrations are protected using cast-in-place firestop sleeve assemblies. It integrates with the HydroFlame Pro Series system, which includes optional water dam and water module accessories for applications with added watertight requirements. The HFEXT81 is appropriate for new construction where slab thickness variations or elevation adjustments require sleeve height extensions after forming and pouring.

Key Features

• 1-inch high extension fits 8-inch cast-in-place HydroFlame Pro Series firestop sleeves
• Compatible with UL listed firestop system providing fire, smoke, and gas spread protection
• Supports water seal capability to resist unwanted water intrusion at floor penetrations
• Works with patented telescoping sleeve design — no field cutting required
• Integrates with optional water dam and water module accessories for watertight assemblies
• Designed for commercial and multi-family concrete floor-slab penetration applications

Compatibility

Designed for use with HOLDRITE HydroFlame Pro Series 8-inch cast-in-place firestop sleeves as part of a UL listed firestop assembly system.

Installation Notes

Installation is typically performed by licensed plumbing or mechanical contractors in compliance with applicable fire and building codes. Ensure the firestop sleeve assembly and all penetrations are installed per the UL listing requirements and the authority having jurisdiction. Do not modify or field-cut the sleeve extension, as alterations may void the UL listing of the firestop assembly. Verify slab elevation and sleeve height requirements prior to concrete placement to confirm correct extension selection.

Technical Specifications

• Extension Height: 1 inch
• Compatible Sleeve Size: 8 inches
• Listing: UL Listed firestop system
• UPC: 671119123166

Standard Information

• Brand: HOLDRITE
• Manufacturer Part Number: HFEXT81