Round Multi-Blade Backdraft Damper
Round Multi-Blade Backdraft Damper - Image 2
Category

Round Multi-Blade Backdraft Damper

Round Multi-Blade Backdraft Damper for HVAC Ventilation Duct Systems

Round Multi-Blade Backdraft Dampers are designed to prevent reverse airflow in HVAC and ventilation duct systems. With multiple gravity-operated blades and a reinforced frame, they provide stable performance, good airtightness, and reliable non-return protection for round duct applications.

Send Inquiry

Product Description

The Round Multi-Blade Backdraft Damper is designed to prevent reverse airflow in round HVAC and ventilation duct systems. It features multiple gravity-operated blades that open automatically when air flows in the intended direction and close when airflow stops or reverses. Compared with single-blade models, the multi-blade structure provides more stable operation, improved closing performance, and better suitability for larger duct diameters.

This damper is widely used in residential, commercial, and light industrial ventilation systems to block outside air, dust, insects, and unwanted backflow from entering the duct line. The reinforced frame construction improves overall strength, while the multi-blade arrangement helps maintain good airtightness and dependable non-return performance.

Manufactured from galvanized steel, aluminum, or other optional materials, the damper offers durability, low maintenance, and easy installation in round duct connections, exhaust outlets, and fan systems.

Key Features

  • Multi-Blade Design  Multiple blades provide stable opening and closing performance
  • Backdraft Prevention  Effectively prevents reverse airflow in round duct systems
  • Gravity Operated  Blades open automatically under airflow and close when airflow stops
  • Reinforced Frame  Strong frame structure improves durability and installation stability
  • Good Airtightness  Multi-blade arrangement helps reduce leakage and improve shut-off performance
  • Low Maintenance  Simple mechanical structure without motor or complex control parts
  • Round Duct Compatibility  Suitable for circular duct and pipe connections
  • Durable Construction  Available in galvanized steel, aluminum, or stainless steel optional

Applications

  • Residential ventilation systems
  • Commercial HVAC systems
  • Exhaust air duct systems
  • Inline fan outlets
  • Wall or ceiling exhaust terminations
  • General building ventilation
  • Air extraction systems
  • Round duct reverse airflow protection

Technical Specifications

Parameter Value / Option
Product Name Round Multi-Blade Backdraft Damper
Type Gravity Operated Non Return Damper
Shape Round / Circular
Blade Structure Multi-blade
Material Galvanized Steel / Aluminum / Stainless Steel optional
Frame Type Reinforced circular frame
Operation Automatic opening by airflow, gravity closing
Installation Round duct connection / exhaust outlet installation
Function Prevent reverse airflow
Feature Good airtightness / stable operation
Application HVAC / Ventilation / Exhaust systems
OEM / ODM Available

Related products