A rubber isolator is a resilient elastomer element that absorbs vibration through material compression and energy dissipation. These isolators are cost-effective solutions for vibration reduction in HVAC systems. They combine vibration damping with load-bearing capacity in a single component.
Material Properties
Rubber isolators are fabricated from natural rubber, neoprene, or EPDM compounds. Material durometer ratings range from 40 to 90 Shore A, affecting stiffness and damping characteristics. Load capacity varies from 100 to 3,000 pounds per isolator depending on size and rubber composition. Operating temperature limits typically span -20°F to 160°F for standard compounds.
Common HVAC Applications
Rubber isolators support packaged air conditioning units, heat pumps, fan coil units, and mounted ductwork. They are installed under equipment feet or within vibration isolation brackets. Multiple isolators distribute equipment weight and improve isolation effectiveness.
Performance Considerations
Rubber isolators achieve 40 to 70 percent vibration isolation at typical operating frequencies. They provide inherent damping that reduces resonant amplification. Performance degrades gradually with age and ozone exposure; replacement is recommended every 5 to 10 years depending on environmental conditions and equipment vibration intensity.