Gas Detection Tools & Calculators
Free engineering reference tools for gas detection and refrigerant safety.
Gas Concentration Converter
Convert between ppm, %vol, %LEL, and mg/m³ for common industrial and HVAC gases. Includes exposure limits and alarm threshold references.
Open ToolASHRAE 15 Refrigerant Detection Guide
Look up ASHRAE 15-2022 refrigerant detection requirements based on refrigerant type, system charge, and space volume.
Open ToolA2L Refrigerant Transition Guide
Find the recommended A2L replacement for your current refrigerant, with detection requirements and EPA AIM Act compliance timelines.
Open ToolAdvisory Disclaimer
This tool is provided for educational and reference purposes only. It summarizes requirements from published standards as of their most recent edition date and does not replace the full text of the applicable standard, local code, or the judgment of a qualified design professional. Values shown here must be verified against the current edition of the relevant standard (ASHRAE 15, ASHRAE 34, IIAR 2, etc.) and the Authority Having Jurisdiction for the project location. Critical Environment Technologies assumes no liability for decisions made using this tool. Always consult a licensed mechanical engineer for system design and compliance determinations.