Balancing air quality improvements with noise control for healthier indoor environments

As the heating season begins, sealed buildings and increased time indoors heighten the importance of indoor air quality (IAQ). Many facilities are adopting portable air purifiers to minimize airborne particulates. However, the fan noise from these units can interfere with communication in classrooms, offices, and other shared spaces.

Two University of Minnesota students conducted separate studies to address this challenge:

Study 1: Airborne Particle Reduction in Patient Care Rooms

Researcher: Thang Nguyen, Environmental Health Science MPH Student
Focus: Effectiveness of Honeywell 300 Series portable HEPA units at various fan speeds.

  • Key Findings:
    • Fan speed 1 reduced particle counts by 44.74%.
    • Medium speed increased reduction to 53.66%.
    • Maximum speed achieved 59.6% reduction, but with minimal additional benefit over medium speed.
    • Optimal performance: Fan speed 2 offered significant air quality improvements without unnecessary noise.

Download the full study PDF

Study 2: Noise and Particulate Control in Larger Spaces

Researcher: William Barford
Focus: Balancing air filtration and noise impact in conference rooms using Medify 113A and Austin Air Health Mate units.

  • Key Findings:
    • Significant particulate reduction at fan speeds 1 and 2.
    • Fan speed 2 was audible but not disruptive, while higher speeds created noticeable noise.
    • Optimal solution: Use multiple units at moderate speeds for effective filtration and minimal noise.

Download the full study PDF

Practical Recommendations for Facilities

  1. Operate purifiers at middle fan speeds for a balance of air quality and quietness.
  2. For larger spaces, consider using multiple units at moderate speeds.
  3. When purchasing a purifier, select one rated for a larger room to reduce the need for higher fan settings.
  4. Conduct basic particulate and noise assessments in your facility for confidence in your IAQ solutions.

Take Action

Enhance your facility’s IAQ while maintaining a comfortable environment. Download the studies or contact IEA to learn more about optimizing indoor air quality for your space.