JAS Siphonic Roof Drain System
A siphonic rainwater system functions only when the entire system is engineered correctly. The siphonic effect is achieved through correct pipe sizing, routing, k‑factor calculations, and full-bore flow behavior. The roof drain is one critical component within a larger hydraulic design. The JAS Siphonic Roof Drain is engineered to stabilize inflow, limit air entry, and reduce turbulence. When combined with proper system design, it helps ensure safe, efficient, and professional protection for your building during high‑intensity storms.
1. Flow‑Optimized Inlet Geometry
The JAS outlet profile is engineered to reduce air entrainment and turbulence at the entry point, helping the pipeline reach full‑bore conditions quickly.
2. Self‑Cleaning Drain Gap
A precise drain gap allows small debris to pass through without obstruction, maintaining system reliability and reducing maintenance needs.
3. Product Models for Different Roof Types
Models for Metal Sheet Roofs:
JAS Primary Outlet
Max Flow Rate : 60 lps
Mini JAS Primary Outlet
Max Flow Rate : 30 lps
Micro JAS Primary Outlet
Max Flow Rate : 12 lps
Models for Concrete Slab Roof:
JAS Concrete Outlet
Max Flow Rate : 60 lps
Mini JAS Concrete Outlet
Max Flow Rate : 30 lps
Micro JAS Concrete Outlet
Max Flow Rate : 12 lps
4. System - Level Engineering Support
JAS provides engineering services to ensure the entire siphonic system is designed correctly:
– Hydraulic design & flow simulation
– Pipe sizing and k‑factor validation
– Coordination with architects & MEP engineers
– Installation consultation and after‑sales support
5. Global Experience and Engineering Heritage
JAS originated from a UK siphonic engineering company with decades of international project work. After acquiring the company over 15 years ago and relocating operations to Thailand, JAS has expanded its global track record while strengthening its engineering capability.
6. Proven Worldwide Performance
JAS siphonic systems operate in airports, malls, factories, data centers, logistics hubs, public buildings, and commercial developments around the world. With thousands of outlets installed and more than 50,000 engineered systems, JAS solutions have been proven under diverse climates, rainfall conditions, and construction methods. When you choose JAS, you choose a system with British engineering heritage, Asian manufacturing capability, and a global record of successful performance.
