What is the typical relative humidity range allowed in animal research facilities?

What is the typical relative humidity range allowed in animal research facilities?

• A. 10-50%.
• B. 40-60%.
• C. 30-70% +/- 5%.
• D. 20-80%.

Answer: (C)

Maintaining stable relative humidity in animal housing is essential for both animal welfare and experimental consistency. Humidity levels impact respiratory mucous membranes, comfort, and stress responses, and they also influence microbial growth and dust. If humidity is too high, condensation, mold, and microbial proliferation can occur, while if it’s too low, animals can experience drying of mucous membranes, increased airway irritation, and more static electricity. Because of these effects on physiology and data quality, facilities aim for a moderate range that works across common lab species and protocols, with a tight control tolerance. A widely accepted target is roughly thirty to seventy percent relative humidity, with about a five percentage point allowance. This range is commonly cited in guidance for laboratory animal care and is achievable with standard HVAC systems, allowing consistent conditions across rooms and over time. If conditions wander outside this band, the environmental controls are adjusted to bring them back in range.

Maintaining stable relative humidity in animal housing is essential for both animal welfare and experimental consistency. Humidity levels impact respiratory mucous membranes, comfort, and stress responses, and they also influence microbial growth and dust. If humidity is too high, condensation, mold, and microbial proliferation can occur, while if it’s too low, animals can experience drying of mucous membranes, increased airway irritation, and more static electricity. Because of these effects on physiology and data quality, facilities aim for a moderate range that works across common lab species and protocols, with a tight control tolerance. A widely accepted target is roughly thirty to seventy percent relative humidity, with about a five percentage point allowance. This range is commonly cited in guidance for laboratory animal care and is achievable with standard HVAC systems, allowing consistent conditions across rooms and over time. If conditions wander outside this band, the environmental controls are adjusted to bring them back in range.