ISO 9001
SMACNA
Product Code: CEI-BD / BD-GI / BD-AL
Back Draft Dampers
صمامات منع الارتداد
Gravity-operated dampers preventing reverse airflow in exhaust and supply systems. Spring-loaded or counterbalanced blade design. Used in kitchen exhaust, bathroom ventilation and emergency generator outlets.
Frame Material
Product Description
Castle Back Draft Dampers prevent reverse airflow in ventilation and exhaust systems. The blades open to allow airflow in one direction and automatically close by gravity when the fan stops — preventing conditioned air from escaping and outdoor air from entering. Available in single-blade and multi-blade configurations for round and rectangular ducts.
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Frame Material | Galvanized steel 1.0mm / Aluminium 1.2mm | — |
| Blade Material | Aluminium sheet — lightweight for gravity operation | — |
| Blade Seal | Rubber or neoprene gasket — airtight when closed | — |
| Operation | Gravity-operated — opens with airflow pressure | — |
| Spring Option | Spring-loaded blades for horizontal mounting | — |
| Shapes | Rectangular / Round | — |
| Rectangular Sizes | 150×150 to 1200×600mm | mm |
| Round Sizes | Ø100 to Ø630mm | mm |
| Mounting | Duct inline / Wall / Ceiling | — |
| Opening Pressure | 2-5 Pa (adjustable with counterweight) | Pa |
| Finish | Mill finish / Powder coated | — |
| Compliance | SMACNA / ASHRAE | — |
Fields of Application
Tests & Certificates
ISO Certification
International Quality Certifications
International Standards
SMACNA · DW144 · IGC · UL
Duct Test
Rigorous leakage and pressure testing to SMACNA and DW144 standards.
Air Tests
Air velocity and distribution testing.
