The Holyoake LR fire smoke damper is specifically engineered for circular ductwork. It is one of the most versatile dampers in the Holyoake range — suitable for all four damper functions in a single model: fire, combined fire and smoke, smoke, and smoke exhaust. Installation requires no sealant and no fixings, using a patented clamping system for fast, clean site work.
The LR fire smoke damper features a low-leakage blade assembly with a blade tip sealing ring, forming an effective barrier against flames, smoke, and high-temperature gases. Each unit is supplied with mounting flanges, a jubilee clip, and a patented heat shield for plasterboard applications.
LR Fire Rating and Compliance
LR fire and smoke dampers have been tested in accordance with AS 1530.4:2014 and AS 1530.7:2007, maintaining integrity for up to four hours with smoke leakage below 50 l/s. Smoke performance meets the requirements of AS 1682.1:2015.
The LR is compliant with the Australian National Construction Code and the NZ Building Code Clause C3. Fire Resistance Ratings vary by damper size and installation type — see table below.
- Tested to AS 1530.4:2014 — up to four-hour fire rating
- Tested to AS 1530.7:2007 — smoke leakage to AS 1682.1:2015
- Smoke leakage: below 50 l/s in testing
Fire Resistance Ratings by Installation Type
| Model range | Installation type | FRR (–/integrity/–) |
|---|---|---|
| LR100 – LR250 | Masonry walls/floors | –/240/– |
| LR100 – LR250 | Plasterboard walls, timber-framed floors, Hebel systems | –/120/– |
| LR300 – LR350 | Masonry, plasterboard, timber-framed, Hebel | –/90/– |
Installation
The LR uses a patented clamping system requiring only a flat-head screwdriver — no sealant, no additional fixings. Installation is permitted in horizontal or vertical plane.
- No sealant required
- No fixings required — clamping system only
- Easy-test and reset fusible link
- Adjustable blade for airflow balancing
- Optional actuator for smoke damper functionality
Applications
The LR is the preferred specification for circular duct penetrations through fire-rated barriers in commercial construction. Typical applications include:
- Circular supply and return duct penetrations through fire-rated walls and floors
- Spiral duct systems in commercial and industrial buildings
- Projects requiring smoke exhaust duty in circular ductwork
- Installations in masonry, plasterboard, and Hebel construction
Specify and Download
Download the LR brochure, BPIR datasheet, and Revit files from the Resources tab. Use the Damper Selection Programme to confirm size, FRR, and configuration for your application.
Related products: HFS fire and smoke damper for rectangular duct | IBD-FS curtain-type fire damper | HCD-ET elevated temperature smoke damper
