The March 2022 paper, published by UL Solutions, investigates the role of door clearance in mitigating refrigerant concentration buildup in spaces experiencing a leak. The study involves a full-scale refrigerant release test with various room tightness configurations to compare gas concentration profiles during and after the release. The research highlights a substantial effect on the amount of refrigerant flowing out of the room due to the clearance under the door. Therefore, the paper concludes that the clearance below the door can serve as a mechanism to reduce the likelihood of refrigerant leaks into adjacent spaces. The findings also underscore the challenges of constructing a tightly sealed room interior.

Keywords: Control & Monitoring Equipment/Sensors, HVAC & Indoor Air Quality (IAQ), Protocols/Standards