Exhaust fans are the "lungs" of a building’s specialized zones—removing heat from kitchens, moisture from toilets, and toxic fumes from laboratories or car parks. Because they pull contaminated air through the fan assembly, they suffer from faster degradation than supply fans. Grease buildup, chemical corrosion, and carbon soot can quickly lead to unbalance, motor overheating, and fire risks.
As part of a Mechanical Fan Overhaul, EKG’s servicing protocol goes beyond a basic wipe-down; we restore the aerodynamic and mechanical integrity of the entire exhaust path.
The primary enemy of an exhaust fan is "Accretion"—the buildup of foreign matter on the blades.
Kitchen Exhausts: Solidified grease acts like a "glue," trapping heat and creating a severe fire hazard. We use industrial-grade alkaline degreasers to return the impeller to bare metal.
Car Park & General Exhaust: Carbon soot and dust create an uneven "crust" on the blades. Even 50 grams of uneven soot can cause a vibration that destroys bearings.
Chemical/Lab Exhaust: We inspect for "Stress Corrosion Cracking" caused by acid vapors. If the blades are pitted, we apply Corrosion-Resistant Coatings.
Exhaust fans often run at high static pressures to pull air through long duct runs. This puts immense strain on the drive components.
Bearing Extraction & Replacement: Exhaust air is often hot (especially in kitchens). We replace standard bearings with High-Temperature Rated Pillow Blocks and use synthetic "Non-Drip" grease that won't melt out of the housing.
Belt & Pulley Alignment: Heat causes belts to stretch and pulleys to expand. We use Laser Alignment and Sonic Tensioning to ensure 100% torque transfer without energy-wasting slippage.
Motor Insulation Audit: We perform a "Megger Test" to ensure that humidity and heat haven't compromised the motor's electrical windings.
A "choked" or "dirty" exhaust fan is an energy thief. When grease or soot changes the blade profile, the fan loses its "bite" on the air, moving less volume while drawing more current.
Optimizing the Flow: A clean, balanced fan moves more air ($m^3/s$) per revolution.
The Math: Restoring the fan’s efficiency allows the Variable Frequency Drive (VFD) to maintain the required negative pressure at a lower speed. According to the Cube Law, a 20% reduction in fan speed results in a nearly 50% reduction in power consumption.
| Service Level | Basic Cleaning | EKG Mechanical Overhaul |
| Impeller | Surface Brush | Chemical Degreasing & ISO G2.5 Balancing |
| Bearings | External Greasing | Full Replacement (High-Temp Grade) |
| Housing | Visual Check | Internal Coating & Leak Sealing |
| Drive System | Visual Check | Laser Alignment & Sonic Tensioning |
| Compliance | None | BOMBA / OSHA Airflow Verification |
Fire Safety Compliance: For kitchen and smoke-spill systems, we ensure your fans meet local fire department (BOMBA) regulations, providing documented proof of restored airflow.
In-Situ Dynamic Balancing: We don't just clean the fan; we balance it while it’s installed. This eliminates the "rumble" that can be felt through the building's structure.
Advanced Material Protection: For corrosive exhausts, we apply Fluoropolymer or Epoxy coatings to the housing and blades to prevent the metal from thinning and leaking.
Vibration Signature Analysis: Every service ends with a digital vibration scan to ensure the unit meets ISO 10816 standards for "Smooth Operation," protecting your long-term investment.
Malaysia
