Section 1: Product Overview

The Smoke fire damper occupies a unique and critical position in building fire protection systems. Unlike a standard fire damper, which is installed in general ventilation ductwork to prevent fire spread during normal HVAC operation, the Smoke Fire Damper is specifically designed for installation within dedicated mechanical smoke exhaust systems. It must fulfill two opposing requirements simultaneously: remaining open to allow active smoke exhaust during the initial phase of a fire event, and closing automatically when exhaust temperatures indicate that fire itself is entering the duct system.

This dual functionality makes the Smoke Fire Damper one of the most technically demanding components in building fire safety design. Its 280°C actuation temperature is a nationally standardized threshold representing the point at which smoke exhaust is no longer benefiting evacuation and the risk of spreading fire through the ductwork outweighs the benefit of continued exhaust. At this point, the damper closes, stopping the fan and cutting off the duct pathway, protecting both the building structure and the mechanical exhaust equipment from fire damage.

Dezhou Pengkai Air Conditioning Equipment Co., Ltd. is a comprehensive HVAC manufacturer based in Dezhou, Shandong Province, integrating research and development, production, sales, installation, and after-sales service. We supply smoke fire damper products to HVAC engineering contractors, building developers, fire protection consultants, and construction procurement teams across domestic and international markets. All products are manufactured in compliance with GB 15930-2024 and available in multiple duct connection sizes and actuator configurations to match the full range of building project requirements.

The Smoke Fire Damper for Exhaust Systems is therefore a mandatory installation requirement under national fire protection building codes for all building types with mechanical smoke exhaust designs.

Section 2: Product Structure and Key Components

Valve Body and Frame The outer frame is fabricated from cold-rolled steel or stainless steel with corrosion-resistant surface treatment, designed for flanged duct connection at smoke exhaust system installation points. Frame dimensions are customizable to match project duct sizes. Stainless steel frame options are available for environments with elevated humidity or mild chemical exposure.

Multi-Blade Linkage Assembly The blade assembly consists of linked metal blades that operate in synchronized open and close movement. In the open state, blades align with airflow to minimize exhaust resistance, ensuring the smoke exhaust fan can operate at full designed capacity. In the closed state, blades interlock to form a sealed face, minimizing leakage of smoke and hot gases through the damper in either direction.

280°C Fusible Link Thermal Release Element The core automatic closure trigger is a 280°C fusible alloy element installed on the blade face in the airflow path. When exhaust air temperature reaches 280°C, the alloy melts and releases the blade locking mechanism. The blades close under stored spring force, cutting off the exhaust duct pathway. This mechanism is a one-time trigger — after thermal activation, the fusible link element must be replaced before the damper can be reset. This one-way design prevents the damper from accidentally reopening during the fire event.

Electric Actuator — Electric Models For electrically controlled configurations, a DC24V electric actuator or electromagnetic release is integrated with the blade assembly. This device receives closure commands from the building fire alarm control panel, enabling remote closure before duct temperatures reach the 280°C thermal threshold. The actuator also supports remote open commands for commissioning and testing purposes.

Signal Feedback Device A micro-switch assembly detects blade position and outputs open and closed status signals to the fire control room in real time. Response time from blade reaching fully closed position to signal output is ≤2 seconds, enabling rapid status updates to the building fire management system.

Manual Operation Handle A dedicated manual closure handle is provided on the accessible face of the damper. Fire event personnel or maintenance technicians can close the damper on-site without relying on the electrical control system. The handle is clearly marked with operational direction indicators.

Fire-Rated Sealing Components Sealing strips manufactured from fire-rated high-temperature materials are fitted along blade edges and frame contact surfaces. These components maintain low air leakage in the closed state, meeting the national standard requirement for smoke containment performance under fire conditions.

Section 3: Technical Specifications

Please contact our sales team with your project duct dimensions, fire resistance rating requirements, and actuator configuration preferences for model selection guidance.

Section 4: The 280°C Threshold — Why It Matters

The 280°C actuation temperature of the Fire Rated Mechanical Exhaust Damper is not an arbitrary value. It is a nationally standardized engineering threshold based on the behavior of building fires and the physics of smoke exhaust system operation.

During the early and middle phases of a building fire, smoke temperatures in exhaust ducts typically range from ambient to well below 280°C. During this phase, active mechanical smoke exhaust provides critical benefit — it removes smoke from evacuation routes, reduces visibility impairment, and decreases toxic gas concentrations in occupied zones, buying time for building occupants to evacuate and for fire services to reach the scene.

However, as a fire intensifies and flames begin entering the exhaust ductwork directly, temperatures rise sharply toward and above 280°C. At this point, continuing to run the smoke exhaust fan would actively draw flames and extreme heat into the duct system, accelerating fire spread to other building zones and risking catastrophic damage to the exhaust fan equipment itself.

The 280°C fusible link element in the Smoke Fire Damper is therefore calibrated to close the damper at exactly the threshold where continued exhaust operation transitions from being beneficial to being dangerous. This timing is what distinguishes the Smoke Fire Damper from both a standard fire damper — which closes at 70°C and would prevent smoke exhaust entirely — and an open exhaust duct, which provides no fire containment at all.

Section 5: How It Works — Three Control Modes

Mode 1: Thermal Automatic Closure — Primary Fail-Safe The 280 Degree Fusible Link Smoke Damper mechanism is the primary and most reliable closure trigger. The fusible alloy element operates independently of the building electrical system. When exhaust temperatures reach 280°C, the alloy melts, releasing the blade locking mechanism. The blades close under stored spring force within 30 seconds, and a simultaneous signal is sent to stop the smoke exhaust fan. This mechanism is completely independent of power supply, fire alarm system status, or operator action, providing the ultimate fail-safe closure under any fire scenario.

Mode 2: Electric Remote Closure — Centralized Control For electric actuator models, the fire alarm control panel can send a DC24V closure command to the Smoke Fire Damper at any point during the fire event. This enables the building fire management team to close specific Dampers based on fire alarm zone data, even before duct temperatures reach 280°C. After electric closure, the damper outputs a closed signal to the fire control room and can optionally trigger fan shutdown via linkage wiring.

Mode 3: Manual On-Site Closure — Emergency Backup If both automatic and electric closure modes are unavailable, trained personnel can close the damper manually using the on-site handle. This mode is also used during commissioning, fire drills, and routine maintenance testing. Manual closure produces the same fully closed blade position and signal feedback output as automatic or electric closure.

Post-Event Reset Procedure The Fire Rated Mechanical Exhaust Damper cannot be automatically reset after closure. All three closure modes result in a locked closed position that requires deliberate manual intervention to reset. If the 280°C fusible alloy element was triggered, it must be replaced with a new element of the same specification before the damper can be reset. This prevents accidental or unauthorized reopening during a fire event and ensures the damper is only returned to service after a conscious verification of safety conditions.

Section 6: Manufacturing Process and Quality Control

Dezhou Pengkai Air Conditioning Equipment Co., Ltd. applies rigorous quality management to all stages of Smoke Fire Damper production:

Material Sourcing and Incoming Inspection Steel sheet, stainless steel, sealing materials, fusible alloy elements, and actuator components are sourced from qualified suppliers. Incoming material inspection verifies dimensional compliance, surface condition, and material certification documentation before materials enter production.

Precision Fabrication Frame and blade components are processed using CNC-controlled sheet metal equipment. Dimensional accuracy is critical to achieving the blade-to-frame sealing performance required by national fire damper standards. Frame corners are formed and joined to eliminate sharp edges and ensure structural integrity at installation.

Blade Assembly and Linkage Testing Blade pairs are assembled into the linkage mechanism and tested for synchronized movement across the full open-to-close travel range. Sealing strip contact across the full blade width is verified before the blade assembly is installed into the frame.

Fusible Alloy Element Installation Each 280°C fusible alloy element is verified for correct temperature rating and installed in the specified orientation on the blade face, directed toward the incoming airflow. Correct orientation is essential for accurate temperature sensing and timely actuation.

Electric Actuator Integration For electric models, the actuator unit is installed, wired, and function-tested at rated DC24V. Signal feedback output is verified at both open and closed blade positions. Linkage signal output for fan shutdown is tested where configured.

Final Inspection and Function Test Every completed unit undergoes manual closure and reset testing, blade movement quality inspection, seal gap measurement, and signal feedback verification. Custom-size units are verified against project drawings before dispatch.

Section 7: Product Features and Advantages

Dual Function in a Single Unit The Smoke Fire Damper eliminates the need to install separate smoke exhaust and fire containment components at the same duct location. Its normally open configuration supports active smoke exhaust during the evacuation phase of a fire, while its 280°C thermal closure provides automatic fire containment when exhaust temperatures reach the critical threshold.

Fail-Safe Thermal Closure Without Power The 280°C fusible link mechanism closes the damper automatically without requiring electrical power, fire alarm system operation, or human intervention. This provides reliable fire containment even under conditions of total power failure or fire alarm system damage.

Triple-Mode Control Redundancy Three independent closure modes — thermal automatic, electric remote, and manual on-site — provide multiple layers of operational redundancy. If any one mode fails, two alternatives remain available, maximizing the probability of correct damper operation under real fire conditions.

One-Way Closure Design Prevents Accidental Reopening After thermal actuation, the 280 Degree Fusible Link Smoke Damper cannot reopen without deliberate manual intervention and replacement of the fusible alloy element. This prevents the damper from reopening due to wind pressure, vibration, or cooling of the exhaust gas after initial closure.

Real-Time Status Feedback to Fire Control Room The ≤2 second signal feedback response time ensures the fire control room receives accurate damper status information almost instantaneously after blade closure, supporting coordinated fire management response.

Fan Protection and Linkage Automatic fan shutdown on damper closure prevents the smoke exhaust fan from continuing to draw extreme heat and flames into the duct system after the 280°C threshold is reached, protecting fan equipment from heat damage and preventing fire acceleration through the ductwork.

Compliant with National Standards All products are manufactured to GB 15930-2024 requirements, with fire resistance performance verified through standard fire resistance testing. Certification documentation supports project fire authority submissions and building permit applications.

The Smoke Fire Damper for Exhaust Systems eliminates the need for separate smoke exhaust and fire containment components at the same duct location, reducing installation complexity and cost.

Section 8: Application Scenarios

The Fire Rated Mechanical Exhaust Damper is installed at specific critical locations within building mechanical smoke exhaust systems, regardless of building type. These mandatory installation positions are defined by national fire protection design codes.

Smoke Exhaust Fan Inlet Duct The highest priority installation location for the Smoke Fire Damper is immediately upstream of the smoke exhaust fan at the fan inlet. Damper closure at this point at 280°C stops the fan from drawing flames and extreme heat into the fan housing, preventing fan equipment destruction and fire spread through the fan discharge ductwork.

Duct Penetrations Across Fire Compartment Boundaries Where smoke exhaust ducts cross fire-rated walls, floor slabs, or other fire compartment boundaries, a Smoke Fire Damper must be installed at the penetration point to prevent fire from crossing the compartment boundary through the duct. This applies to both horizontal and vertical duct runs.

Smoke Zone Branch Duct Connections In buildings divided into multiple smoke control zones, each zone's branch duct connection to the main smoke exhaust duct requires a Smoke Fire Damper installation to isolate individual zones during a fire event and prevent one zone's fire from affecting the exhaust capacity of adjacent zones.

Vertical Exhaust Shaft Entry and Exit Points At each floor level where horizontal exhaust ductwork connects to a vertical exhaust shaft, a Smoke Fire Damper is required to prevent the vertical shaft from acting as a fire and smoke spread pathway between floors.

Combined Exhaust and Ventilation System Ducts In buildings where the mechanical ventilation and smoke exhaust systems share ductwork, the 280 Degree Fusible Link Smoke Damper is installed at key duct nodes to manage the transition between normal ventilation mode and fire emergency exhaust mode while maintaining fire containment capability.

High-Rise Residential and Commercial Buildings Stairwell, lobby, corridor, and ante-room mechanical smoke exhaust systems in high-rise buildings require Smoke Fire Damper installations at all mandatory positions.

Shopping Malls and Large Retail Complexes Underground shopping levels, large retail floor smoke exhaust systems, food court zone exhaust, and enclosed corridor exhaust systems require Smoke Fire Damper installations throughout the duct network.

Underground Car Parks Underground parking structures require comprehensive mechanical smoke exhaust coverage. The Fire Rated Mechanical Exhaust Damper is installed at zone boundaries, fan inlets, and shaft connection points throughout the parking structure.

Hospitals, Schools, and Public Assembly Buildings Healthcare buildings, educational facilities, sports arenas, transport terminals, and entertainment venues with mechanical smoke exhaust systems require Smoke Fire Damper installations at all code-mandated positions.

Industrial Buildings and Warehouses Factory production areas, storage warehouses, and logistics facilities with mechanical smoke exhaust systems require Smoke Fire Damper installations, with stainless steel frame options available for high-temperature or mildly corrosive production environments.

Across all building types, the Smoke Fire Damper for Exhaust Systems is the single component that bridges the gap between active smoke exhaust performance and passive fire containment within the same duct network.

Section 9: Customer Application Feedback

Our Smoke Fire Damper products have been supplied across a wide range of building project types throughout Southeast Asia and international markets. The following reflects representative feedback:

"We specified Pengkai smoke fire dampers for the mechanical exhaust systems of a large underground shopping complex. The 280°C actuation units integrated correctly with our fan linkage wiring, and the units passed fire authority commissioning inspection first time. The technical documentation package provided was thorough and saved us significant time during the authority submission process." — Fire Protection Engineering Contractor, Southeast Asia

"For a high-rise mixed-use development, we needed smoke fire dampers at both fan inlet and floor-crossing duct positions. Pengkai was able to supply consistent quality across a large number of units with matching dimensions. The packaging held up well during sea freight transit and all units arrived ready for installation." — HVAC Engineering Company, Regional Project

"We have used the Pengkai 280 Degree Fusible Link Smoke Damper across several hospital projects. Performance during annual fire system inspections has been consistently reliable, and Pengkai provides responsive after-sales support when we need replacement fusible alloy elements or technical documentation for re-inspection submissions." — Building Services Maintenance Contractor

Section 10: Installation Guidelines

Pre-Installation Checks Verify that the model, 280°C actuation temperature, fire resistance rating, and dimensional specifications match the project fire protection design documents. Confirm fire protection product certification is present. Inspect the frame, blades, fusible alloy element, seals, actuator, and manual handle for transport damage before beginning installation.

Fusible Alloy Element Orientation The fusible alloy element must face the incoming airflow direction — toward the smoke source side of the duct. Reverse installation will delay temperature sensing and extend closure response time beyond the required ≤30 seconds. The damper body carries clear orientation markings that must be followed during installation.

Independent Structural Support Mount the damper on an independent structural support bracket. Do not suspend the damper weight from ductwork flanges alone, as duct movement or vibration can compromise the damper-to-wall sealing interface.

Fire-Rated Penetration Sealing Seal the gap between the damper frame and the wall, slab, or partition penetration opening with approved fire-rated intumescent or mortar sealing material. This prevents smoke and fire from bypassing the damper through the structural gap around the frame.

Flange Connection Connect ductwork flanges using fire-rated sealing gaskets. Tighten bolts evenly in a diagonal sequence to achieve uniform gasket compression. Maximum allowable connection gap is within national standard tolerances.

Electrical Connection — Electric Models Route DC24V supply and signal feedback wiring in fire-rated conduit. Connect to fire alarm linkage module per project wiring diagram. Secure all terminal connections. Verify fan linkage wiring is correctly connected for fan shutdown on damper closure.

Commissioning Tests Before system commissioning, perform manual closure and reset tests, electric closure and reset tests for electric models, signal feedback verification at the fire control room, and fan linkage shutdown verification. Document all commissioning test results.

Section 11: Maintenance Schedule

Monthly Inspection Inspect the frame and blade assembly for physical damage and corrosion. Confirm the damper is in the fully open position with blades aligned with airflow. Check the fusible alloy element is correctly installed on the blade face, undamaged, and free from grease, paint, or dust coating that could impair temperature sensing. Inspect manual handle and electric actuator condition.

Semi-Annual Function Test Conduct manual closure and reset cycle tests and electric closure and reset tests for electric models. Verify signal feedback output at both open and closed positions. Confirm fan linkage shutdown operates correctly on damper closure. Reset and record results after testing.

Annual Certified Inspection Engage a qualified fire protection inspection body for annual fire resistance performance verification, air leakage measurement, fusible alloy element condition assessment, and issuance of annual inspection report. This report is required for building fire safety compliance records.

Fusible Alloy Element Replacement Replace the 280°C fusible alloy element every two to three years as a scheduled maintenance item, or immediately following any fire event where thermal actuation occurred. Use only replacement elements of identical specification — 280°C rated, fire-rated grade. Non-standard substitutes must not be used.

Section 12: Packaging, Shipping, and Lead Time

Packaging Each Smoke Fire Damper unit is individually packaged in protective carton packaging with foam corner and edge protection to prevent transport damage. Larger project orders are palletized and stretch-wrapped for container loading. Export-grade packaging is available for sea freight shipments to Southeast Asia and international destinations.

Minimum Order Quantity We accept both small-quantity orders for project sampling and large-volume orders for full building supply contracts. Please contact our sales team to discuss project-specific requirements and volume pricing.

Lead Time Standard sizes in the 280°C actuation temperature rating are held in warehouse stock for short lead times. Custom-size orders and non-standard actuator configurations are produced to order, with lead times confirmed at order placement.

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

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

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 all Smoke 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 undergoes incoming material inspection, in-process quality control at key fabrication stages, and finished product function testing before release.

Fire protection product certification documentation is available to support project fire authority submissions, building permit applications, and third-party inspection requirements. We welcome pre-shipment inspection arrangements by buyer-designated inspection agencies for project-specific orders.