Request for quotation and technical documentation for wind driven turbine ventilators:  
? Product Specifications: 350mm size with flashing and roof membrane accessories  
? Required Certifications: Test report confirming suitability for 280 km/h application (if available)  
? Material Requirements: Technical datasheets and specifications sheet  
? Quantity: 9 pieces  
? Delivery Requirements: Availability confirmation and lead time details  
Suppliers must provide:  
1. Commercial quotation with FOB terms  
2. Material compliance documentation  
3. Performance certification for high-speed applications  
4. Production timeline and shipping schedule  
Please exclude pricing in initial technical response. Priority given to manufacturers with railway/aerospace material experience.