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Carbon dioxide concentrations in unventilated IVC cages
Thomas C Krohn1, Axel Kornerup Hansen
1Scanbur A/S, Lellinge, Denmark. tkr@kvl.dk
Laboratory Animals
|April 12, 2002
Summary
Individually ventilated cage (IVC) systems can develop high carbon dioxide (CO2) levels when unventilated. CO2 concentrations may reach 2-8% within 2 hours, depending on cage seal and animal density.
Area of Science:
- Laboratory animal science
- Environmental monitoring
- Animal welfare
Background:
- Individually ventilated cage (IVC) systems are increasingly used globally.
- Sealed IVC systems enhance protection for animals and staff but pose ventilation challenges.
Purpose of the Study:
- To investigate the potential for problematic carbon dioxide (CO2) accumulation in unventilated IVC systems.
- To determine the impact of cage seal tightness and animal density on CO2 levels.
Main Methods:
- Experimental setup involving IVC systems with varying seal tightness.
- Monitoring of CO2 concentrations within cages over a 2-hour period.
- Varying the number of animals housed per cage.
Main Results:
- CO2 levels increased significantly in unventilated IVC systems.
- Concentrations ranged from 2% to 8% within 2 hours.
- Higher CO2 levels were observed with tighter seals and greater animal density.
Conclusions:
- Unventilated IVC systems can rapidly develop hazardous CO2 concentrations.
- Cage seal integrity and animal stocking density are critical factors influencing indoor air quality.
- Proper ventilation protocols are essential for maintaining a safe environment in IVC systems.