ISO 9001
SMACNA
Product Code: CEI-BD / BD-GI / BD-AL
Back Draft Registres
Valve منع الارتداد
Gravity-operated dampers preventing reverse airflow in exhaust et supply systems. Spring-loaded ou counterbalanced blade design. Used in kitchen exhaust, bathroom ventilation et emergency generatou outlets.
Frame Material
Product Description
Castle Back Draft Registres prevent reverse airflow in ventilation et exhaust systems. Le blades open to allow airflow in one direction et automatically close by gravity when le fan stops — preventing conditioned air de escaping et outdoou air de entering. Available in single-blade et multi-blade configurations pour round et rectangular ducts.
Technical Spécifications
| Parameter | Value | Unit |
|---|---|---|
| Frame Material | Galvanized steel 1.0mm / Aluminium 1.2mm | — |
| Blade Material | Aluminium sheet — lightweight pour gravity operation | — |
| Blade Seal | Rubber ou neoprene gasket — airtight when closed | — |
| Operation | Gravity-operated — opens avec airflow pressure | — |
| Spring Option | Spring-loaded blades pour houizontal 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 avec counterweight) | Pa |
| Finish | Mill finish / Powder coated | — |
| Compliance | SMACNA / ASHRAE | — |
Fields of Application
Tests & Certificates
ISO Certification
International Quality Certifications
Normes Internationales
SMACNA · DW144 · IGC · UL
Duct Test
Rigouous leakage et pressure testing to SMACNA et DW144 standards.
Air Tests
Vitesse d'air et distribution testing.
