R-290 — commercial-grade propane — has a GWP of 3, an A3 flammability classification, and a charge limit measured in grams. Here is what the 150g limit (and the recently raised 300g limit for some categories) actually allows, and what changes in service.
The AIM Act technology-transitions rule caps new commercial refrigeration at GWP ≤ 150 in most end uses on the 2026–2027 phase-in. R-290 has a GWP of 3.
R-290 is also a hydrocarbon and is classified A3 by ASHRAE 15 — “higher flammability.” Equipment using R-290 must be UL-listed and built to the relevant standards (UL 60335-2-89 for self-contained commercial refrigerating appliances, UL 60335-2-40 for HVAC).
The combination drives R-290 toward small, factory-charged, self-contained equipment where the charge can be physically limited and the equipment can be built and certified as a unit.
Historically, EPA SNAP listed R-290 as acceptable subject to use conditions in self-contained commercial refrigeration up to 150g per circuit, mirroring the original IEC 60335-2-89 standard.
Updates to UL 60335-2-89 (Edition 2) increased the permissible charge for some self-contained commercial refrigerating appliances up to 500g per circuit, depending on the specific category and equipment design. EPA SNAP has been progressively updated to align with the revised charge limits for various end uses.
For an operator the practical answer is to read the data plate. The factory-charged unit will state the refrigerant type and the charge weight. If it says R-290 and lists a charge under the applicable limit for that equipment’s category, the unit is legal under SNAP for that use.
Self-contained reach-in coolers and freezers under the charge limit — single doors typically fit, multi-doors increasingly fit under the revised UL/IEC standard.
Beverage merchandisers, ice merchandisers, and small ice machines.
Self-contained prep tables, undercounters, and worktops within the equipment category limit.
Vaccine refrigerators, blood-bank cabinets, and pharmacy fridges — most purpose-built medical refrigeration uses R-290 in 2026 model years.
Some self-contained ULT freezers operate on R-290 / R-170 cascade systems built to the relevant equipment standards.
Walk-in coolers and walk-in freezers (built up architectures, charges always exceed the per-circuit limit).
Supermarket racks and remote condensing systems (charge by definition exceeds the limit).
Most commercial split systems and rooftop A/C — commercial HVAC is on the GWP-700 cap, not GWP-150, and uses R-454B or R-32 in the volume.
Large remote refrigeration in c-stores, cold storage, and food manufacturing — typically R-454C, R-455A, or operator choice of R-744 (which we don’t service).
EPA 608 certification covers R-290 service — although for most R-290 self-contained equipment, the service is at the unit level (replacement of an entire unit or a sealed component) rather than open-circuit refrigerant work.
Equipment design specifies sealed circuits, factory charge, and limited field service. Most R-290 self-contained units are not field-rechargeable in any practical sense — a leak is a unit replacement.
When open-circuit work is required, A3-rated tools and procedures apply. Hydrocarbon-rated leak detection. Spark sources and ignition controls. Ventilation requirements per the equipment manufacturer service manual and per applicable fire code.
Tampa Bay AHJ interpretation of A3 self-contained equipment install: typical c-store and foodservice installations sit comfortably within standard listings; specific installation conditions (mechanical room placement, basement use, multiple-unit accumulations) require engineering review.
C-store: new reach-ins and beer-cave self-contained units shipping in 2026–2028 are largely R-290. Mixed-fleet stores during transition — some R-404A units running through end-of-life, new units arriving on R-290.
Foodservice: prep tables, undercounters, reach-ins. New equipment on R-290 in most categories. Service mostly unit-level on sealed-system equipment.
Pharmacy and veterinary: Helmer, Thermo Scientific, Migali, So-Low, and similar manufacturers are largely R-290 in 2026 catalogs. Sealed-system service; calibration, alarms, and door seals are the field-serviceable items.
Floral, ag, schools, senior living, hotels, stadiums: same pattern wherever self-contained equipment is the architecture.
R-290 is propane. It is also legally and chemically the same molecule as the propane in a barbecue tank. The grade required for refrigerant use is purer (typically 99.5%+), but the molecule is the same.
R-290 is not a drop-in for R-22 or R-404A. Equipment listings, charge limits, and ASHRAE 15 classification all preclude field conversion.
A unit charged with R-290 is safe to operate under its listing. The charge limit is set so that worst-case leak into the surrounding space remains under the lower flammability limit by design margin.
R-290 service is not particularly dangerous to a trained, certified technician with appropriate tools. It is dangerous to an untrained tech treating it like an HFC.
Maximum refrigerant charge in a single sealed self-contained refrigeration circuit. Some applications under updated UL/IEC standards now allow higher charges (up to 500g for certain commercial refrigerating appliance categories). The data plate on the unit states the actual factory charge.
Equipment listings and applicable fire code govern installation locations for hydrocarbon-charged equipment. Most self-contained R-290 commercial equipment is listed for general installation; specific locations may require engineering review.
At the unit level for sealed-system R-290 equipment, service is largely component replacement (compressor, fan, control board) without opening the refrigerant circuit. When circuit work is required, A3-rated tools and procedures apply.
Yes, EPA 608 Universal covers R-290 work and we carry the appropriate hydrocarbon-rated tools. Most R-290 self-contained service is unit-level.
Equipment listings address worst-case-leak scenarios. Properly listed and properly installed R-290 equipment poses minimal fire hazard relative to other kitchen ignition sources.
Suncoast Cold Systems services commercial refrigeration and HVAC across Tampa, St. Petersburg, Clearwater, Brandon, Riverview, Temple Terrace, and Wesley Chapel. 24/7 dispatch. Specific response targets are agreed in writing for service-contract customers, by site tier and severity. State Certified Class A Air Conditioning Contractor (FL #CAC1824642), EPA 608 Universal, OSHA 30 Construction.
Flammability classes, charge limits, and install code.
By industry: where R-290 fits, where it doesn’t.
The other low-GWP path: A2L blends instead of A3 hydrocarbon.