Effective ventilation duct design is the science of moving the maximum volume of air with the minimum amount of energy and noise. In Malaysia’s high-humidity climate, a poor design doesn’t just lead to high electricity bills—it causes "dead zones" where moisture accumulates, leading to mold growth and poor Indoor Air Quality (IAQ).
At EKG, we utilize Equal Friction and Static Regain methodologies to ensure your "Air Path" is balanced from the fan outlet to the furthest terminal.
A well-designed system functions like a tree, where the trunk size reduces as air is "shed" into various branches.
Velocity Limits: To prevent excessive noise (whistling), we design main ducts for velocities between 7.5 to 12.5 meters per second (m/s) for industrial areas, while keeping office branch ducts below 4 to 6 m/s.
Aspect Ratio Control: We aim for an ideal aspect ratio of 1:1 (square) or 2:1. When a duct is too "flat" (e.g., 8:1), the internal friction increases dramatically, requiring a much larger fan to push the same amount of air.
Turning Vanes: In tight KL ceiling plenums where sharp bends are unavoidable, we design internal airfoil vanes to guide the air. This prevents "flow separation" and turbulence at the corners.
Depending on your building's scale, we apply specific mathematical models to the design:
Equal Friction Method: Best for constant volume systems. We size the duct so that the pressure loss per meter is the same throughout. It’s simple and reliable for standard retail or warehouse layouts.
Static Regain Method: The gold standard for high-rise offices and VAV systems. As the duct reduces in size, the "velocity pressure" is converted back into "static pressure."
The Result: This ensures that the vent 50 meters away receives the exact same airflow as the vent 5 meters away, eliminating "Hot Spots" in the building.
The most critical part of duct design is minimizing "Static Pressure Drop." Every Pascal of resistance is a permanent tax on your operational budget.
The Math: According to the Cube Law, a design that reduces system resistance allows the fan's Variable Frequency Drive (VFD) to slow down. A 20% reduction in fan speed results in a nearly 50% reduction in power consumption.
Smooth Transitions: We avoid abrupt "T-Junctions." Our designs use 45-degree entries and "boot" transitions to maintain laminar flow, which is essential for achieving 2026 energy efficiency benchmarks.
| Feature | Commercial Office | Industrial/Laboratory |
| Primary Material | G.I. / Pre-Insulated Phenolic | Stainless Steel 316 / PP-H |
| Design Velocity | 5 - 8 m/s | 12 - 18 m/s (High Velocity) |
| Leakage Class | SMACNA Class A | Fully Welded / Zero Leak |
| Noise Target | NC 30 - 35 | NC 45 - 50 |
| Acoustics | Internal Lining / Silencers | External Lagging |
3D BIM Coordination: We don't design in 2D. We use Building Information Modeling (BIM) to identify "clashes" with fire sprinklers, cable trays, and structural beams before a single piece of metal is cut.
Psychrometric Analysis: In Malaysia, we must design for Latent Heat (moisture). We ensure your duct insulation thickness is calculated against the local Dew Point to prevent "Ceiling Rain" (condensation).
Total Air Balancing (TAB) Support: Our designs include "Test Holes" and "Volume Control Dampers" (VCDs) at strategic points. This allows our commissioning team to balance the system to within 5% of the design CFM.
Compliance with MS 1525: Our designs are optimized to meet Malaysian Standards for energy efficiency in non-residential buildings, ensuring your facility passes federal energy audits.
Malaysia
