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A2L Refrigerant Safety Check

Tool · 03 of 07 · IEC 60335-2-89:2019
Step 1

Refrigerant & equipment

A2L refrigerants only — these are the ones with charge limits.
Evaporator
Pick a class-typical evaporator profile, or enter pumpdown manually from your datasheet.
Step 1b

In-room piping

Liquid + suction line lengths inside the conditioned space — between the safety shut-off valves outside the room and the evaporator inside. Sets how much extra refrigerant is at risk on a leak.

m
m
Step 2

Room geometry

m²
The actual room being checked.
m
IEC default 2.2 m. Higher ceiling = larger volume = lower risk.
Step 3

Occupancy class

ASHRAE 15 class

How this calculator works

The A2L minimum room area calculator determines the smallest floor area (m²) of a machinery room or occupied space that satisfies the flammable-gas concentration limit for mildly flammable (A2L) refrigerants under IEC 60335-2-89:2019. The method: (1) identify the leakable charge from the entered system charge (kg) — IEC defines leakable charge as the full system charge for field-assembled systems; (2) divide by the LFLroom concentration limit for the selected refrigerant (in kg/m³, from IEC 60335-2-89 Annex T); (3) divide by the entered room height to get minimum floor area. ASHRAE 15 occupancy classes A (low-density public), B (high-density public), and C (machine room / restricted access) apply different LFL fractions — typically 25 %, 50 %, and not-limited respectively. Supported refrigerants: R-32, R-454A, R-454B, R-454C, R-455A with correct LFL and molecular weight values per ASHRAE 34-2022. This tool is a pre-design screening check; the final safety assessment must be made by a suitably qualified engineer per EN 378-1 or local DRAP/NEPRA requirements.

References: IEC 60335-2-89:2019 §7.4 and Annex T; ASHRAE Standard 34-2022; EN 378-1:2016+A1:2021; ASHRAE 15-2019.

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