HotShield - High Operating Temperature Damper


HotShield - High Operating Temperature Damper

Key Features

  • Smoke Management & Fire Dampers operational up to 300˚C for a period of two hours
  • Thermally Insulated Electric Control Modes
  • Pneumatic option available 250˚C for one hour
  • Halogen Free Low Smoke & Fume cabling supplied as a standard feature
  • Low closed blade leakage
  • HotShield Dampers when closed have up to 4 hours fire resistance when tested to BS476 Parts 20 and 22
  • Actionpac Damper Control System compatibility
  • HotShield Vent PTC™ reverse action dampers for High Operating Temperature Smoke Control & Extract Applications
  • HotBox Thermal Enclosure - superior performance to older thermal enclosures this uses our specially developed lightweight, high performance material.

Actionair have developed the HotShield PTC™ High Temperature Smoke Management and Fire Dampers along with the HotShield Vent PTC™ Smoke Control and Extract Dampers to enable the concepts of fire engineering to be employed in ducted smoke ventilation systems.

These dampers designed, tested and approved to deliver high temperature operation at up to 300 °C for two hours, provide the designer with the capability of extracting hot smoke and combustion gases through a common smoke extraction duct linked to adjacent fire zones and floors.

As smoke can spread rapidly and efficiently through a building ductwork system, damper operation needs to be initiated by a smoke detection system, as thermal sensing can often be too late. HotShield PTC™ and HotShield Vent PTC™ dampers are designed to be interfaced with a smoke detection/fire alarm system.

Thermal Enclosure

Actionair have developed a new technically advanced thermal enclosure that actually has the ability to absorb heat energy when subjected to a high temperature environment.

The performance criteria involves continuous operation of the complete damper and actuator assembly at elevated temperatures.

This new enclosure is made from a phenolic composite resin with excellent endothermic properties. A chemical reaction occurs within the insulating material when it is heated. This reaction has the effect of lowering the temperature inside the enclosure, thus prolonging the duration of the actuator’s operation at elevated temperatures.

Smoke and other products of combustion kill at least 80% of recorded ‘fire victims’, smoke is debilitating and can render people unconscious minimising their chances of survival. Many more die weeks or months later from the lingering effects and toxic effects of smoke inhalation.

Smoke and toxic gases – the Silent Killers – have to be managed and controlled quickly and effectively to avoid confusion and panic from the threat posed to life safety and the extraction and control of these deadly gases is of paramount importance for the safe evacuation of the buildings occupants. 

The importance of the subsequent smoke damage that can occur to adjacent property and fittings is also recognised, as this can have disastrous effects on homes and businesses as recognised in the Loss Prevention Council Design Guide for Fire Protection in Buildings.


HotShield PTC™ High Operating Temperature Smoke Management and Fire Dampers

Designed for installation in high temperature ductwork systems with mechanical smoke extraction. As these ductwork systems regularly serve more than one fire zone or floor when smoke extraction is conducted from one area, it is essential to fully fire protect adjoining fire zones from ductwork penetrations that are connected to the smoke extract duct.

For this purpose HotShield PTC™ dampers, when closed are a fire resisting damper to BS 476 part 20 for up to four hours, thus providing the fire isolation required. Closure of the damper is achieved by removal/loss of the electrical supply. When used for smoke extraction, under authorised control, the HotShield PTC™ damper will remain open under electrical power for a period of two hours at temperatures of up to 300 °C thus allowing the safe extraction of smoke and hot gases of combustion through the extended fire compartment created by the fire resisting ductwork.

HotShield PTC™ Smoke Management Fire Dampers may also be used for controlled supply of make up air as a function of the fire engineering process.

HotShield Vent PTC™ High Operating Temperature Smoke Control and Extract Dampers

Provide flexible smoke management where other fire compartments are not interconnected to a common fire resisting ductwork system. Designed to spring to the open position by stored energy and remain closed when powered. HotShield Vent PTC™ dampers allow controlled smoke extraction to take place with a dedicated smoke control system if required, but retaining low leak closure of the smoke extract duct penetrations into the protected space during normal conditions.

Casing Features

With double skin spigotted galvanised steel (to BS EN 10142) casing the HotShield PTC™ dampers comply to Class A and B of Eurovent Document 2/2 and Test Procedures for Classes A, B and C of HVCA Ductwork Specification DW144. Damper casings are manufactured with welded spigotted connections suitable for Square, Rectangular, Circular and Flat Oval duct connections. As an extra cost option, casings can be manufactured in 430 grade (Type 1.4016) Ferritic or 316 grade (Type 1.4401) Austenitic stainless steel, 1.2mm thick.

Blade Features

The Damper blades are aerodynamic,double skin 430 grade (Type 1.4016) to BS EN 10088-2 Ferritic stainless steel which are 75mm deep and interlock to form a positive smoke and fire resisting shield. Incorporated within the blade profile is a high temperature silicone seal to ensure low closed blade leakage at temperatures up to 300°C for two hours. Stainless steel blade end bearings and peripheral gasketting maintain the low closed blade leakage allowing for expansion under full fire conditions. Optional Blade construction 316 grade (Type 1.4401) Austenitic Stainless Steel.


Application Parameters

HotShield PTC™ and HotShield Vent PTC™ Dampers to maximum width and height dimensions can be used where the operating total system pressure is up to 1500 Pascals and duct velocities to 15m/second. As with any life safety damper product, a suitable planned inspection programme should be implemented. For specialist and/or aggressive applications, please refer to Actionair Sales Office.


A new generation High Operating Temperature Smoke Management and Fire Damper, thermally Insulated Control Mode assembly, with a unique and dedicated Proportional Torque Control for optimised Damper/Control Mode torque performance. The unique snaplock™ drive interface ensures user friendly, easy and secure connection of the Control Mode to the damper. The drive interface, which is totally independent of the ductwork, and provides ease of connection to square, rectangular, circular and flat oval ductwork, including fire resisting ductwork.

Product Documents

Title Type Added
Control Modes and Accessories for the PTC™ Damper Interface Brochure about 7 months ago
HotShield Catalogue Brochure about a year ago

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