Profile: Marley HVLS Fans specializes in providing gear fans and exhaust fans. Our heavy-duty exhaust fans are designed with an Energy Efficient engine and dynamically balanced impellers for smooth and vibration-free operation. The turbo profile blades increase air supply, while the aluminum pressure die-cast motor housing with fins improves heat dissipation and results in a cooler motor. For maintenance, they have a pre-lubricated double ball bearing. Exhaust Fan removes contaminated air from the environment and replaces it with fresh air. When there is a high concentration of hot air, moisture, carbon dioxide, vaporized chemicals, dust, fungus spores, and unpleasant scents in the air, it is deemed polluted.