<a href='https://www.pengkaihvac.com/tag/multiblade-smoke-exhaust-vent' target='_blank' class='key-tag'><font><strong>Multi-Blade Smoke Exhaust Vent</strong></font></a> | Dezhou Pengkai HVACSection 1: Product Overview
The Multi-Blade Smoke Exhaust Vent is a purpose-engineered mechanical fire protection component designed for installation in building smoke exhaust and fire control systems. It serves as a critical life-safety device in the event of a fire, rapidly opening to create a direct exhaust pathway that removes smoke, heat, and toxic gases from the fire zone, securing evacuation routes and enabling effective firefighting operations.
In normal daily conditions, the unit remains in a fully closed and sealed state, preventing air leakage between building zones and contributing to the overall Energy Efficiency of the HVAC system. Upon fire alarm activation, the vent opens within 15 seconds via DC24V electric signal or manual operation, simultaneously triggering the smoke exhaust fan to initiate the full exhaust cycle.
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 fire protection ventilation components to HVAC contractors, building developers, fire protection engineering companies, and construction distributors across Southeast Asia and global markets.
Section 2: Product Structure and Key Components
The unit is composed of seven primary structural elements:
Valve Body Frame Fabricated from galvanized steel sheet or stainless steel, the outer frame provides structural rigidity and fire resistance. It is designed for direct flange-sealed connection to building wall openings or duct systems, ensuring a secure and airtight fit.
Multi-Blade Linkage Assembly Multiple metal blades are arranged in a synchronized linkage configuration. When closed, the blades form a tight sealing surface. When opened, all blades pivot simultaneously to guide airflow into the smoke exhaust duct. This linked design ensures consistent open and close performance across the full blade array.
Actuator Mechanism The actuator integrates a DC24V electric actuator, a manual override device, and a reset mechanism. This configuration allows automatic response to fire alarm signals, manual emergency operation under power failure conditions, and straightforward reset after a fire event.
Sealing Components High-temperature silicone or heat-resistant rubber seals are fitted along blade edges and frame contact surfaces. These maintain low air leakage in the closed state, ensuring compliance with national standards for smoke containment between fire compartments.
Control and Feedback Device An electromagnetic release mechanism and micro-switch assembly work together to receive DC24V control signals from the fire alarm panel and output real-time open or closed status signals back to the fire control room.
Decorative Front Panel A louvered or grille-style panel covers the front face of the unit, integrating cleanly with wall and ceiling interior finishes while protecting internal components from accidental contact.
280°C Fusible Alloy Element — Fire-Rated Models A fusible alloy temperature sensor is installed within the airflow path. When exhaust air temperature reaches 280°C, the alloy melts, triggering automatic blade closure and a simultaneous shutdown signal to the smoke exhaust fan. This is a one-time-use safety device requiring replacement after activation.
Section 3: Technical Specifications
Parameter Specification
Blade Configuration Multi-blade synchronized linkage
Normal Operating State Normally closed (NC)
Actuation Voltage DC24V
Opening Response Time ≤ 15 seconds
Auto-Close Temperature 280°C (fire-rated models)
Frame Material Galvanized steel / Stainless steel
Sealing Material High-temperature silicone / Heat-resistant rubber
Installation Type Side-wall mount / Ceiling-recessed mount
Control Modes Electric (DC24V) + Manual override
Signal Feedback Open / Closed status via micro-switch output
Applicable Standard GB 15930-2024
Surface Treatment Powder-coated, corrosion-resistant finish
Size Range Custom sizes available upon request
Operating Environment Indoor, commercial and industrial buildings
Detailed dimensional specifications and product model parameters are available upon request. Please contact our sales team with your specific project requirements.
Section 4: How It Works
Normal Daily Operation The Multi-Blade Smoke Exhaust Vent remains in its normally closed, sealed state during standard building operation. Blades are locked by the actuator, and the unit draws no active power. This prevents cross-zone air and smoke migration, supporting fire compartment integrity and limiting HVAC energy loss.
Automatic Electric Actuation When smoke or temperature sensors detect a fire, the alarm control panel sends a DC24V signal to the vent. The electromagnetic release responds within 15 seconds, unlocking the blade linkage and opening the blades fully. A simultaneous linkage signal activates the smoke exhaust fan, creating active airflow through the duct system.
Manual Emergency Operation Under power failure or control system fault, trained personnel can activate the unit manually via the pull-cord or handle. This ensures smoke exhaust capability remains available regardless of electrical system status.
High-Temperature Auto-Close For fire-rated models, the 280°C fusible alloy continuously monitors exhaust temperature. At 280°C, the alloy melts, triggering automatic blade closure and fan shutdown. This prevents flames and extreme heat from traveling further through the ductwork to other building zones.
Post-Fire Reset After the fire event is controlled, the unit must be manually reset to its normally closed position. If the fusible alloy was triggered, a replacement alloy element of identical specification must be installed before reset and return to service.
Section 5: Manufacturing and Quality Standards
Dezhou Pengkai Air Conditioning Equipment Co., Ltd. manufactures the Fire Rated Smoke Vent Damper using cold-rolled steel and stainless steel base materials sourced from qualified domestic suppliers. Each unit passes through the following production quality controls before dispatch:
Raw Material Inspection All incoming steel sheet, sealing materials, and actuator components are inspected against specification requirements before entering production. Material certifications are retained for traceability.
Precision Fabrication Frame components are cut, formed, and assembled using CNC-controlled equipment to ensure dimensional consistency. Blade linkage assemblies are fitted and tested for synchronized movement before installation into the frame.
Surface Treatment All steel components receive corrosion-resistant surface treatment. Standard models are powder-coated for long-term durability in indoor building environments. Stainless steel options are available for high-humidity or corrosive applications.
Function and Seal Testing Each completed unit undergoes actuation function testing, seal leakage verification, and electrical signal feedback testing before leaving the production line. Dimensional inspection is performed against approved project drawings for custom-size orders.
Certification Compliance Products are manufactured in compliance with GB 15930-2024, the national standard for fire Dampers used in building ventilation and smoke exhaust systems. Fire protection certification documentation is available for supply to project fire safety consultants and building authorities.
Section 6: Product Features and Advantages
Rapid Smoke Clearance The synchronized multi-blade opening creates a wide, evenly distributed airflow inlet. This efficiently channels smoke, heat, and toxic gases into the exhaust duct, rapidly clearing the fire zone and maintaining visibility and breathable conditions in evacuation routes.
Dual-Control Reliability Electric actuation via DC24V integrates fully with the building fire alarm system for automatic response. Manual override provides a reliable backup under power failure or control system fault, ensuring emergency smoke exhaust operation at all times.
Automatic Fire Containment at 280°C The integrated fusible alloy provides final-stage fire containment. At 280°C, the Normally Closed Smoke Exhaust Vent blades close automatically, cutting off the duct pathway to prevent flames from traveling between fire compartments.
Low Leakage in Sealed State High-temperature silicone seals maintain low air leakage between building zones during normal operation, supporting HVAC efficiency and fire compartment integrity simultaneously.
Real-Time System Monitoring The micro-switch feedback output reports open and closed status continuously to the fire control room, giving operators real-time visibility of vent status during fire events.
Flexible Installation Options Available in side-wall and ceiling-recessed configurations with a decorative front panel, the unit integrates cleanly with a wide range of building interior finishes, from industrial facilities to hotel and healthcare environments.
Long Service Life Galvanized steel and stainless steel frame options with corrosion-resistant surface treatment deliver long service life with low routine maintenance requirements.
Section 7: Application Scenarios
The Building Fire Smoke Control Vent is specified for locations where natural smoke ventilation is insufficient and mechanical smoke exhaust is required under national fire safety regulations.
High-Rise Residential and Commercial Buildings Stairwells, fire lobbies, pressurization ante-rooms, refuge floors, and fire elevator lobbies in high-rise buildings are mandatory installation locations under national building fire codes. Rapid smoke clearance in these zones is critical to protecting evacuation routes.
Shopping Malls and Retail Complexes Large retail floors, underground shopping levels, enclosed corridors, and food court areas require mechanical smoke exhaust coverage due to high occupancy density and enclosed layouts.
Underground Parking Facilities Underground car parks have no natural ventilation pathway. The Building Fire Smoke Control Vent is installed at zone intervals throughout parking structures to provide compartmentalized smoke control during fire events.
Hospitals and Healthcare Facilities Wards, corridors, operating theatres, and enclosed internal spaces in hospital buildings require dependable smoke exhaust to protect patients with limited mobility. The normally closed daily operation prevents cross-zone air contamination.
Hotels and Hospitality Buildings Internal corridors, windowless guestrooms, conference rooms, and basement service areas require mechanical smoke exhaust. The decorative front panel allows clean integration with high-specification hotel interior finishes.
Industrial Facilities and Warehouses Factory production floors, storage warehouses, electrical equipment rooms, and boiler rooms require mechanical smoke exhaust appropriate to their fire load. Stainless steel frame configurations are available for high-humidity or mildly corrosive environments.
Schools, Cinemas, and Public Assembly Buildings Schools, universities, cinemas, theatres, sports arenas, and transport terminals with high occupancy enclosed spaces require comprehensive mechanical smoke exhaust coverage in corridors, basement areas, and internal rooms.
Section 8: Customer Application Feedback
Our Fire Rated Smoke Vent Damper has been supplied to HVAC contractors and building projects across Southeast Asia and international markets. The following reflects common feedback themes from buyers and project engineers:
"We specified Pengkai smoke exhaust vents for a large mixed-use development in our region. The DC24V actuation integrated cleanly with our fire alarm panel, and the units passed fire authority commissioning inspection without issues. Lead time and packaging for sea freight were both well managed." — HVAC Contractor, Southeast Asia
"We have used Pengkai damper products across several hospital and commercial building projects. The build quality is consistent, documentation for fire certification submission is complete, and the after-sales team responds quickly when we have technical questions during installation." — Fire Protection Engineering Company
"The decorative panel finish on the Pengkai units worked well for our hotel project, where the interior design team required the vents to be visually integrated with the corridor wall finish. The units performed correctly during the fire system commissioning test." — Building Developer, Regional Project
Section 9: Installation Guidelines
Pre-Installation Verification Confirm that the product model, actuation temperature rating, and dimensional specifications match the project fire protection design documents. Verify that the unit carries the required fire protection certification. Inspect the frame, blades, actuator, seals, and accessories for any transport damage before beginning installation.
Positioning Requirements Install the Normally Closed Smoke Exhaust Vent at the designated smoke exhaust duct outlet, ante-room exhaust position, or interior exhaust point as specified in the building fire protection design. Position the unit within 200mm of the wall or floor slab surface where duct penetrations occur.
Structural Fixing and Sealing Mount the unit on an independent structural support bracket. Connect flanges using fire-rated sealing gaskets, tightening bolts evenly to maintain a connection gap of no more than 1mm. This prevents smoke leakage at the installation interface under fire conditions.
Electrical Connection Connect the DC24V supply line and signal feedback line to the fire alarm linkage module. All connections must be reliably grounded and routed through fire-rated protective conduit. Terminal connections must be firmly secured.
Manual Device Positioning Position the pull-cord or manual handle at an accessible height of 1.2 to 1.5 meters from floor level, running vertically without obstruction or twisting.
Commissioning Tests Before Service Perform manual actuation, electric actuation, and signal feedback tests before the system is put into service. Confirm blades open and close without obstruction, feedback signals are correctly received by the fire control room, and smoke exhaust fan linkage operates correctly.
Section 10: Maintenance Schedule
Monthly Inspection Inspect the frame, front panel, and blade assembly for deformation, corrosion, or physical damage. Confirm blades seal fully in the closed position with no visible gaps. Check that the pull-cord or manual handle is free from breakage or obstruction. Test remote actuation from the fire control room and verify feedback signal reception.
Semi-Annual Linkage Test Conduct a full system linkage test in coordination with the building fire alarm system and smoke exhaust fan operators. Simulate fire alarm trigger conditions, confirm the vent opens within 15 seconds, verify fan linkage activation, and confirm all status signals are correctly reported. Reset the unit after testing and record results.
Seal and Lubrication Service Clean dust and debris from the blade assembly and frame interior periodically to prevent actuator mechanism obstruction. Apply a small quantity of high-temperature lubricating oil to actuator pivot points and blade hinge locations. Inspect silicone seals for hardening, cracking, or detachment and replace as needed with components of the same specification.
Fusible Alloy Replacement After any event where the 280°C fusible alloy has been triggered, replace the alloy element with a new component of identical specification before resetting the unit. Non-standard or substitute components must not be used, as this would compromise compliance with GB 15930-2024.
Section 11: Packaging, Shipping, and Lead Time
Packaging Each unit is individually packaged in protective carton packaging with foam corner 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 models are available from warehouse stock with short lead times. Custom sizes and non-standard specifications are produced to order, with lead times confirmed at order placement based on current production scheduling.
Shipping We ship from Dezhou, Shandong Province. Sea freight, air freight, and express courier options are 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 larger project orders.
Sample Policy Product samples are available for pre-order quality inspection. Sample costs and shipping fees are discussed with buyers prior to dispatch. We encourage buyers to request samples before placing full project orders to confirm specification compliance and product quality.
Section 12: After-Sales Support and Warranty
Dezhou Pengkai provides technical support for installation, commissioning, and maintenance of all products supplied. Our technical team is available to assist with product selection for specific project requirements, including custom sizing consultation and specification documentation for fire protection system design submissions.
Replacement components, including fusible alloy elements, sealing gaskets, and actuator assemblies, are available as original parts to ensure continued compliance with national fire protection standards throughout the product service life.
We welcome HVAC distributors, fire protection engineering contractors, building developers, and construction procurement teams to contact us to discuss project supply arrangements and long-term partnership opportunities.
Payment Terms Standard payment terms are available for established buyers. We support T/T bank transfer and other payment arrangements as agreed. Please contact our sales team to discuss terms appropriate to your order volume and procurement process.
Section 13: Product Encyclopedia
What is a Multi-Blade Smoke Exhaust Vent?
A smoke exhaust vent is a mechanical fire protection component installed in building smoke exhaust systems. It consists of a metal frame housing multiple linked blades that remain closed during normal building operation and open automatically or manually during a fire emergency to create a smoke exhaust pathway connected to the building's duct and fan system.
The unit connects to the building fire alarm control system via a DC24V electrical circuit. When the alarm panel detects a fire, it activates the vent, causing the blades to open within 15 seconds. This connects the fire zone to the exhaust duct and fan, drawing smoke and toxic gases out of the building.
Fire-rated models incorporate a 280°C fusible alloy that triggers automatic blade closure when exhaust temperatures reach this level, preventing flames from traveling through ductwork to other building zones.
This type of vent is a mandatory component in high-rise buildings, shopping centers, underground facilities, hospitals, and industrial buildings where mechanical smoke exhaust is required under national fire protection building codes. It is designed for long service life with low routine maintenance requirements, requiring only periodic inspection of seals, the fusible alloy element, and actuator mechanism functionality.
What is a Multi-Blade Smoke Exhaust Vent?
A Multi-Blade Smoke Exhaust Vent is a mechanical fire protection component installed in building smoke exhaust systems. It consists of a metal frame housing multiple linked blades that remain closed during normal building operation and open automatically or manually during a fire emergency to create a smoke exhaust pathway.
The unit is connected to the building's fire alarm control system via a DC24V electrical circuit. When the fire alarm panel detects a fire event, it sends an activation signal to the vent, causing the blades to open within 15 seconds. This opening connects the fire zone to the building's smoke exhaust ductwork and fan system, drawing smoke and toxic gases out of the building.
Fire-rated versions of the Multi-Blade Smoke Exhaust Vent incorporate a 280°C fusible alloy element that triggers automatic blade closure when exhaust temperatures reach this threshold. This prevents flames from traveling through the ductwork to other building zones, maintaining the integrity of fire compartmentalization.
The Normally Closed Smoke Exhaust Vent is the most commonly specified configuration for internal corridors, ante-rooms, and enclosed spaces in high-rise buildings, shopping centers, underground facilities, hospitals, and industrial buildings. It is a mandatory component in buildings required to provide mechanical smoke exhaust under national fire protection building codes.
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