Section 1: Product Overview

The Fire Rated Ventilation Damper is a mandatory fire safety component in building HVAC and ventilation duct systems. Its primary function is to remain open during normal building operation, allowing unrestricted airflow through ventilation and air conditioning ductwork, while automatically closing when a fire event raises duct air temperatures to the designated threshold. This closure cuts off the duct pathway, preventing fire, flames, and smoke from traveling through ventilation ductwork across fire compartment boundaries and into other occupied building zones.

As buildings grow taller and more complex, the risk of fire spreading through interconnected duct systems becomes a critical design concern. The Fire Rated Ventilation Damper addresses this risk at every duct penetration point across fire-rated walls, floor slabs, and mechanical room partitions. Its installation is a mandatory requirement under national building fire protection design codes for all commercial, industrial, and residential construction projects in China and across many Southeast Asian markets.

Dezhou Pengkai Air Conditioning Equipment Co., Ltd. is a Dezhou, Shandong-based comprehensive HVAC manufacturer integrating research and development, production, sales, installation, and after-sales service. We supply fire damper products to HVAC engineering contractors, building developers, fire protection consultants, and construction procurement teams across domestic and international markets. Our products are manufactured in compliance with applicable national standards and are available in multiple temperature ratings, drive configurations, and duct connection sizes to match the full range of building project requirements.

Section 2: Product Structure and Key Components

Valve Body and Frame The outer frame is fabricated from cold-rolled steel sheet with a minimum thickness of 1.2mm, surface-treated with a corrosion-resistant powder coating or galvanized finish. The frame is designed for flanged duct connection, ensuring a sealed and structurally secure installation at duct penetration points. Stainless steel frame options are available for kitchen exhaust and high-humidity environments.

Multi-Blade Linkage Assembly The blade assembly consists of opposing pairs of metal blades in a linked configuration. Blade thickness meets a minimum of 0.8mm per national standard requirements. In the open state, blades align parallel to airflow, presenting minimal resistance to ventilation. In the closed state, blades interlock to form a sealed surface, minimizing smoke and air leakage across the damper face.

Thermal Release Mechanism The core automatic closing trigger is a fusible alloy element or memory alloy spring installed within the airflow path. When air temperature in the duct rises to the set actuation temperature — 70°C, 150°C, or 280°C depending on the model — the alloy element melts or the spring deforms, releasing the blade locking mechanism. The blades then close under spring or gravity force, cutting off the duct pathway. This mechanism operates without electrical power, providing a fail-safe closure function independent of building electrical systems.

Electric Actuator — Electric Models For electrically controlled models, an electromagnetic release unit or electric actuator motor is integrated with the blade assembly. This device receives DC24V linkage signals from the building fire alarm control panel, triggering blade closure on command. The electric actuator also enables remote open and close control for testing and commissioning purposes.

Signal Feedback Device A micro-switch assembly is installed to detect blade position. When the damper closes, the micro-switch outputs a closed status signal to the fire control room, enabling real-time monitoring of damper status across the building fire safety system. Open status is similarly reported when the damper is reset and returned to service.

Manual Control and Reset Device A pull-cord, rotary knob, or lever handle is provided for manual emergency closure and post-fire reset. This device is positioned on the accessible face of the damper for straightforward operation during maintenance, fire drills, and post-fire recovery.

High-Temperature Sealing Components Sealing strips manufactured from heat-resistant silicone or equivalent high-temperature material are fitted along blade edges and frame contact faces. These components minimize air and smoke leakage across the closed damper face, maintaining the fire compartment seal under fire conditions.

Section 3: Technical Specifications

Detailed dimensional specifications and model selection guidance are available upon request. Please contact our sales team with your project duct size and application requirements.

Section 4: Temperature Rating Selection Guide

One of the most important aspects of specifying the Fire Rated Ventilation Damper correctly is selecting the appropriate actuation temperature for the installation environment. Using the wrong temperature rating is a common installation error that can result in either premature closure under normal operating conditions or failure to close when needed during a fire.

70°C — Standard Ventilation and Air Conditioning Systems The 70°C rating is the most widely specified actuation temperature for general HVAC ductwork in commercial, office, hotel, hospital, and residential buildings. At 70°C, duct air temperatures are well above normal HVAC operating ranges but indicate the early-stage presence of fire-heated air. This is the correct specification for duct runs in air conditioning supply and return systems, mechanical room penetrations, and general building ventilation ductwork.

150°C — Kitchen Exhaust Systems Kitchen exhaust ductwork regularly carries hot air, grease vapors, and cooking fumes at temperatures significantly above the 70°C standard rating. Installing a 70°C damper in kitchen exhaust would result in frequent unwanted closures during normal cooking operations. The 150°C rating is the correct specification for kitchen hood exhaust branches connecting to vertical exhaust shafts, preventing grease fire spread while avoiding false triggering under normal cooking conditions.

280°C — Smoke Exhaust Systems The 280°C rating is used exclusively in dedicated mechanical smoke exhaust ductwork, where the damper must remain open during the active smoke exhaust phase of a fire event and only close when temperatures indicate that fire itself — rather than smoke — is entering the duct system. This rating corresponds to the point at which continued exhaust operation would no longer support evacuation and would risk spreading fire through the ductwork.

Section 5: How It Works — Operating Principle

Normal Daily Operation In standard building conditions, the Automatic Closing Fire Damper remains fully open, presenting minimal resistance to airflow through the HVAC or ventilation system. Blade position is maintained by the fusible alloy element or electromagnetic holding force in electric models. The damper does not interfere with normal building ventilation, air conditioning, heating, or exhaust operations.

Thermal Trigger — Mechanical Closure When a fire occurs and heated air or smoke begins traveling through the ductwork, temperature rises progressively along the duct run. When the air temperature at the damper location reaches the set actuation temperature, the fusible alloy element melts and releases the blade locking mechanism. Stored spring energy or gravity drives the blades to the fully closed position within 30 seconds. This action cuts off airflow and prevents fire from advancing through the duct to adjacent building zones. The closing action simultaneously triggers the micro-switch to output a closed signal to the fire control room and can be configured to send a linkage signal to stop associated ventilation or exhaust fans.

Electric Signal Trigger — Remote ClosureFor Electric Actuator Fire Damper models, the fire alarm control panel sends a DC24V closure command directly to the damper actuator, triggering blade closure before duct temperatures reach the thermal actuation threshold. the fire alarm control panel can send a DC24V closure command directly to the damper actuator, triggering blade closure before duct temperatures reach the thermal actuation threshold. This enables the building fire management team to proactively close Dampers in affected zones based on alarm zone data, improving overall fire containment speed.

Manual Closure In emergency situations or during maintenance and fire drill operations, the damper can be closed manually using the pull-cord, knob, or lever handle. Manual closure produces the same blade-closed position and signal feedback output as automatic or electric closure.

Post-Event Reset After a fire event or drill, the damper must be manually reset to the open position. For models where the fusible alloy element was triggered, the alloy must be replaced with a new component of identical specification before the damper can be reset. Reset is performed by operating the manual reset device until the blade locking mechanism re-engages and the micro-switch reports an open status to the fire control room.

Section 6: Manufacturing Process and Quality Control

Dezhou Pengkai Air Conditioning Equipment Co., Ltd. applies systematic quality management across all stages of Thermal Fusible Link Fire Damper production:

Steel Selection and Incoming Inspection Cold-rolled steel and stainless steel sheet are sourced from qualified suppliers and subject to incoming dimensional and surface quality inspection. Material certification documents are retained for each production batch.

CNC Cutting and Forming Frame and blade components are cut and formed using CNC-controlled sheet metal processing equipment. This ensures dimensional accuracy and consistency across production runs, which is critical for the blade-to-frame sealing performance required by fire damper standards.

Blade and Linkage Assembly Blade pairs are assembled into the linkage mechanism and tested for synchronized open and close movement before installation into the frame. Blade edge sealing strips are fitted and verified for continuous contact across the full blade width.

Actuator Integration and Calibration For electric actuator models, the actuator unit is installed, wired, and function-tested for correct operation at rated DC24V supply voltage. Signal feedback micro-switch output is verified against blade position at both open and closed states.

Fusible Alloy Element Installation and Verification Each thermal release element is verified for correct actuation temperature rating before installation. Elements are installed in the specified orientation within the airflow path to ensure accurate temperature sensing.

Final Function Test and Inspection Every completed unit undergoes a full function test including manual closure, reset, signal feedback verification, and seal gap inspection. Custom-size units are additionally verified against project-specific dimensional drawings before dispatch.

Section 7: Product Features and Advantages

Fail-Safe Mechanical Closure The thermal fusible link mechanism operates without electrical power. Even under total building power failure, the Fire Rated Ventilation Damper will close automatically when duct temperatures reach the actuation threshold, providing a reliable last-resort fire containment function independent of the building electrical or fire alarm systems.

Three Temperature Ratings for System-Specific Accuracy Offering 70°C, 150°C, and 280°C actuation temperatures allows accurate specification for general HVAC, kitchen exhaust, and smoke exhaust applications respectively. Using the correct temperature rating prevents both false triggering under normal operation and failure to actuate when needed during a fire.

Electric Actuator Integration for Rapid Remote Response Electric actuator models of the HVAC Duct Fire Protection Damper connect directly to the building fire alarm linkage system, enabling remote closure commands from the fire control room. This allows faster, zone-based fire containment response compared to thermal-only actuation.The Electric Actuator Fire Damper is ideal for large building projects where zone-based fire containment must be managed centrally from the fire control room, enabling faster response than thermal-only actuation.

Reliable Smoke Containment Performance With an air leakage rate of ≤100 m³/(h·m²) at 1500 Pa in the closed state, the damper provides effective smoke containment between fire compartments, limiting smoke migration to adjacent zones during the critical early stages of a fire event.

Fan Linkage Capability On closure, the damper can send a linkage signal to stop associated ventilation or exhaust fans, preventing continued fan operation from driving fire-heated air or flames further through the duct system and reducing the risk of fan equipment damage.

Wide Application Range Rectangular and circular duct configurations, multiple size options, and custom fabrication capability allow the Automatic Closing Fire Damper to be specified for duct systems ranging from small branch ducts to large main duct runs in any building type.

Low Maintenance Requirements The simple mechanical structure requires only periodic cleaning, lubrication of moving parts, and inspection of the fusible alloy element. No complex electronic components require routine servicing, reducing long-term maintenance costs for building operators.

Section 8: Application Scenarios

Commercial Office Buildings HVAC supply and return duct penetrations through fire-rated floor slabs and compartment walls in office towers require 70°C rated dampers at each penetration point. Mechanical room duct penetrations, electrical room ventilation ducts, and weak current room ventilation connections are all standard installation locations.

Shopping Malls and Retail Complexes Central mall air conditioning supply ducts, underground shopping level ventilation, escalator void ventilation, and food court area exhaust systems all require Fire Rated Ventilation Damper installations at compartment boundaries. Kitchen exhaust branches from food court tenants require 150°C rated units.

Hotels and Hospitality Properties Guestroom floor HVAC supply and return risers penetrating floor slabs, corridor air conditioning ducts, kitchen exhaust from restaurant and banqueting operations, and basement car park ventilation all require fire damper installations matched to their respective application temperatures.

Hospitals and Healthcare Facilities Ward floor HVAC supply ducts, pharmacy and laboratory exhaust ventilation, operating theatre pressurization and exhaust systems, and kitchen and catering exhaust branches all require correctly rated Thermal Fusible Link Fire Damper installations to meet the stringent fire safety requirements applicable to healthcare buildings.

Residential High-Rise Buildings Corridor ventilation duct penetrations, stairwell pressurization duct penetrations, kitchen exhaust branches connecting to shared vertical exhaust shafts, and underground car park ventilation systems in high-rise residential buildings require fire damper installations at each fire compartment boundary crossing.For office towers with BMS integration requirements, the Electric Actuator Fire Damper provides remote open and close capability for both fire response and routine commissioning operations.

Industrial Facilities General production area ventilation systems, electrical switchroom and transformer room ventilation ducts, paint spray booth exhaust systems, and warehouse ventilation duct runs in industrial buildings require fire dampers matched to the fire risk profile of each space.

Underground Car Parks and Tunnels Mechanical ventilation and smoke exhaust ductwork in underground car parks requires HVAC Duct Fire Protection Damper installations at zone boundaries and duct penetrations through structural fire-rated walls and slabs.

Section 9: Customer Application Feedback

Our fire damper products have been supplied across a wide range of building project types in Southeast Asia and international markets. The following reflects representative feedback from buyers and project teams:

"We specified Pengkai fire dampers for a large office tower project requiring compliance with local fire authority standards. The 70°C units performed correctly during fire system commissioning, and the certification documentation package provided by Pengkai was complete and accepted by the fire authority without queries." — HVAC Engineering Contractor, Southeast Asia

"For a hotel renovation project, we needed both 70°C and 150°C rated dampers for the HVAC and kitchen exhaust systems. Pengkai was able to supply both temperature ratings with matching dimensions and consistent build quality. Packaging for the sea freight shipment was solid and arrived without damage." — Building Services Consultant, Regional Project

"We have worked with Pengkai on hospital and school projects over several years. Their Automatic Closing Fire Damper products consistently pass commissioning inspection, and the after-sales team provides prompt technical support when we encounter installation questions on site." — Fire Protection Engineering Company

Section 10: Installation Guidelines

Pre-Installation Checks Verify that the model, actuation temperature rating, and dimensional specifications match the project fire protection design. Confirm that the unit carries the required fire protection product certification and inspection certificate. Check that the frame, blades, actuator, thermal release element, and sealing components are undamaged.

Installation Position Install the Fire Rated Ventilation Damper within 200mm of the fire-rated wall, floor slab, or partition surface at each duct penetration point. The damper body arrow marking must align with the intended airflow direction. Reverse installation will cause sealing failure and non-compliance with fire protection standards.

Independent Support Bracket The damper must be supported on an independent structural bracket, not suspended from the ductwork alone. This prevents duct deformation or movement from displacing the damper and compromising the seal at the wall penetration.

Flange Connection and Fire Sealing Connect to ductwork using fire-rated sealing gaskets at all flange faces. Tighten bolts evenly in a diagonal sequence to ensure even compression of the sealing gasket. Seal the gap between the damper frame and the wall or slab penetration with approved fire-rated intumescent or mortar sealing material.

Electrical Connection — Electric Models Route DC24V supply and signal feedback wiring in fire-rated conduit. Connect to the fire alarm linkage module per the project wiring diagram. Verify ground connection. Secure all terminal connections firmly.

Commissioning Tests Before putting the system into service, perform manual closure and reset tests, electric actuation and reset tests for electric models, temperature sensor actuation tests using an approved heating device, signal feedback verification at the fire control room, and smoke leakage checks using a smoke pencil or equivalent device.

Section 11: Maintenance Schedule

Monthly Routine Inspection Clean blade surfaces and frame interior of dust and grease accumulation. Inspect manual pull-cord or handle for damage. Verify electric model indicator light status is normal. Conduct remote actuation test from fire control room and confirm signal feedback response.

Quarterly Function Test Perform manual and electric open and close cycle tests. Verify blade movement is smooth and synchronized. Confirm signal feedback outputs correspond correctly to blade position at both open and closed states.

Annual Certified Inspection Engage a qualified fire protection inspection body to conduct annual thermal actuation testing, smoke leakage measurement, fire resistance performance verification, and issue an annual inspection report. This report is required for building fire safety compliance records.

Fusible Alloy Element Replacement Replace the thermal release element every two to three years as a scheduled maintenance item, or immediately after any fire event where thermal actuation has occurred. Use only replacement elements of the same actuation temperature rating and specification as the original installed component.

Section 12: Packaging, Shipping, and Lead Time

Packaging Each Fire Rated Ventilation Damper unit is individually packaged in protective carton packaging with foam cushioning at corners and edges to prevent transport damage. Larger project orders are palletized and stretch-wrapped for container loading. Export-grade outer packaging is available for sea freight shipments.

Lead Time Standard sizes in common temperature ratings are held in warehouse stock for short lead times. Custom-size orders and non-standard temperature or actuator configurations are produced to order. Lead times for custom orders are confirmed at the time of order placement based on current production scheduling.

Shipping We ship from Dezhou, Shandong Province. Sea freight, air freight, and international express courier options are all available. We coordinate with established freight forwarding partners serving Southeast Asia, the Middle East, and global destinations. Both FCL and LCL sea freight options are available for project-volume orders.

Sample Policy Samples of standard models are available for pre-order quality and specification verification. Sample costs and shipping fees are agreed with buyers prior to dispatch. We strongly recommend buyers request and inspect samples before placing full project supply orders.

Payment Terms We support T/T bank transfer and other payment arrangements as mutually agreed. Please contact our sales team to discuss terms appropriate to your procurement process and order volume.

Section 13: Certifications and Quality Assurance

Dezhou Pengkai Air Conditioning Equipment Co., Ltd. manufactures fire damper products in compliance with GB 15930-2024, the national standard governing fire dampers for building ventilation and smoke exhaust systems. Each production batch is subject to incoming material inspection, in-process quality control, and finished product function testing before release.

Fire protection product certification documentation is available to support project fire authority submissions and building permit applications. We welcome third-party inspection arrangements for project-specific orders. Buyers may engage their preferred inspection agency for factory inspection or pre-shipment product testing as required by their procurement process.