A spring isolator is a mechanical device using compressed steel or elastomer springs to suspend HVAC equipment and absorb vibration energy. Spring isolators provide superior vibration damping compared to passive pads by maintaining consistent performance across varying load conditions. They are engineered for specific frequency response and load ratings.
Technical Characteristics
Spring isolators use nested coil springs or elastomer springs with adjustable stiffness rated in pounds per inch (lb/in). Deflection typically ranges from 0.5 to 2.0 inches under rated load. Common load ratings span 300 to 10,000 pounds per isolator. Natural frequency is calculated between 2 and 5 Hz, matching isolation efficiency to typical HVAC vibration frequencies of 50 to 120 Hz.
Installation Applications
Spring isolators are mounted under equipment feet or suspended from structural beams using hanger brackets. They are preferred for rooftop units, large fans, and chillers requiring precise vibration control. Isolation effectiveness improves with proper load distribution and spring selection matching equipment weight and characteristics.
Performance Benefits
Spring isolators achieve 80 to 95 percent vibration isolation at operating frequencies. They reduce noise transmission, protect structural components, and accommodate equipment movement during operation. Regular inspection ensures springs maintain rated deflection and equipment stability.