Under the 2026 HFC leak repair rules, an industrial process refrigeration appliance with 15 pounds or more of covered refrigerant triggers repair obligations when its leak rate exceeds 30%. The normal deadline to find, repair, and run the initial verification test is 30 days. If the repair requires an industrial process shutdown, the deadline is 120 days. Neither case needs an EPA request; the regulation states both windows directly. A follow-up verification test is due within 10 days after that.
The "extension" in this article's title is often misunderstood. In 40 CFR 84.106, the 120-day window isn't one of the extensions. It's the base deadline when a shutdown is needed. True extensions are separate. They require an electronic request to EPA and are limited to three grounds: radiological contamination, conflicting regulations, and unavailable components. For the components case, the cap is 180 days from the exceedance, or 270 days when a shutdown is involved. If the owner writes a retrofit or retirement plan instead of repairing, IPR gets its own extension track beyond the normal one-year completion deadline, most often for custom-built equipment with long lead times.
The sections below cover which systems count as IPR, how the two clocks run, how to use the extensions correctly, and the inspection, monitoring, and reporting obligations that follow a repair.
Which Systems Count as Industrial Process Refrigeration
The classification decides whether the trigger is 30%, 20%, or 10%, so it comes first. 40 CFR 84.102 defines industrial process refrigeration as "complex customized refrigerant-containing appliances that are directly linked to the processes used in, for example, the chemical, pharmaceutical, petrochemical, and manufacturing industries."
Two parts of that definition matter in practice:
- "Directly linked to the processes." A chiller cooling a reactor jacket, a condenser recovering solvent, or a refrigeration skid holding a production step at temperature is IPR. The same plant's office air conditioning is comfort cooling, and a finished-goods freezer warehouse may be commercial refrigeration under the cold storage warehouse subsector.
- "Complex customized." IPR equipment is typically engineered to a process specification rather than bought off a catalog. This matters again later, because the retrofit extension depends on equipment that meets the regulation's separate definition of custom-built.
The scope rules are the same as for other categories. The program applies to appliances with a full charge of 15 pounds or more of an HFC or substitute with a GWP above 53, and took effect January 1, 2026, according to EPA's leak repair fact sheet. Ammonia systems, common in industrial refrigeration, are outside this HFC program because of their GWP.
EPA Leak Rate Thresholds: 10%, 20%, 30%
IPR has the highest trigger of the three categories.
| Category | Leak rate trigger | Found in a typical plant |
|---|---|---|
| Industrial process refrigeration | 30% | Process chillers, reactor and solvent-recovery cooling, custom skids |
| Commercial refrigeration | 20% | On-site cold storage warehouse equipment |
| Comfort cooling and other appliances | 10% | Office and occupied-space air conditioning |
Thresholds per EPA's January 2026 fact sheet on leak repair under 40 CFR Part 84; category definitions per 40 CFR 84.102. Equipment examples are illustrative.
The higher trigger reflects how these systems are built: long field-assembled circuits, many mechanical joints, and operating conditions set by the process. It does not relax any other requirement. Once an IPR appliance passes 30%, it follows the same repair, verification, and inspection sequence as any other covered appliance, with the timing differences described below.
Older IPR systems still running on ozone-depleting refrigerants fall under a separate program. EPA's Section 608 leak repair requirements apply a 30% industrial process trigger to ODS appliances of 50 pounds or more and provide the same 120-day window when an industrial process shutdown is required.
Calculating the Leak Rate on a Process System
The trigger is tested by a leak rate calculation at every refrigerant addition, using either the annualizing or the rolling average method. Get Freon's guide to calculating an appliance leak rate under the 2026 HFC rules covers both methods, the 365-day cap, and the rolling-window reset, with worked examples.
Three points are specific to IPR:
- Full charge on custom systems. Manufacturer figures rarely match a field-built process system. The regulation lets you determine full charge by calculating component and piping volumes, by weighed measurements, or by using the midpoint of an established range. On a skid with large receivers and long interconnecting runs, the calculation method is usually the only defensible one.
- Process load changes charge. The regulation defines "normal operating characteristics and conditions" as the temperatures, pressures, flows, and full charge expected "for a given process load and ambient condition." A system whose operating charge moves with process load needs that range documented, or ordinary load changes will look like leaks.
- Seasonal variance. Where refrigerant is removed and re-added because of a seasonal change in ambient conditions, the same seasonal variance exception applies, and so does the requirement to record both the removal and the addition.
The Standard Clock: 30 Days
When a calculation shows an IPR appliance above 30%, 40 CFR 84.106 requires the owner or operator to identify and repair the leaks within 30 days. A certified technician performs the leak inspection. The repairs must bring the leak rate below the threshold, not just fix the first leak found.
The initial verification test must also be completed inside that window. The regulation defines it as a leak test "conducted after the repair is finished to verify that a leak or leaks have been repaired before refrigerant is added back to the appliance." A follow-up verification test comes within 10 days of the successful initial test, or within 10 days of the appliance returning to normal operating characteristics and conditions.
For process equipment that can be isolated and repaired while the plant keeps running, such as a failed valve packing or an accessible flare, 30 days is usually workable. When the leak is somewhere that can't be reached with the process running, the second clock applies.
The Shutdown Clock: 120 Days
Throughout 84.106, the 30-day deadline carries the same parenthetical: "(or 120 days if an industrial process shutdown is required)." That applies to repairing the leak and to completing the initial verification test.
This is the provision the article title calls an extension, and three points about it are worth being precise on:
- It isn't requested. Unlike the extensions in the next section, the 120-day window is the applicable deadline whenever a shutdown is required. There's no EPA approval step. The owner still needs a documented basis for saying a shutdown was required.
- It depends on the repair, not the system. The question is whether this specific repair requires shutting down the industrial process. A leak on an isolatable accessory line of a process chiller may be repairable within 30 days even though a leak on the main heat exchanger of the same chiller would not.
- It counts from the exceedance. The window runs from the date the leak rate was exceeded, not from the next scheduled turnaround. If the plant's next planned outage is six months away, the 120 days don't stretch to meet it.
The practical value of the 120-day window is that the repair can line up with a production shutdown the plant can plan, rather than an emergency stop. Getting that benefit depends on recording the exceedance date immediately and starting the outage planning the same week.
Extensions to the Repair Deadline: Three Grounds Only
Beyond the 30- and 120-day windows, 84.106(f) allows additional time on exactly three grounds:
- Radiological contamination. The appliance is "located in an area subject to radiological contamination or shutting down the refrigerant-containing appliance will directly lead to radiological contamination." Additional time is allowed as needed to complete repairs safely.
- Other regulations. "Requirements of other applicable Federal, State, local, or Tribal regulations make repairs within 30 days (or 120 days if an industrial process shutdown is required) impossible." Additional time is allowed as needed to comply with those rules. This comes up in plants where permits, process safety management, or hot-work restrictions control when a system can be opened.
- Unavailable components. Parts that must be replaced "are not available within 30 days (or 120 days if an industrial process shutdown is required)." The regulation then allows "up to 30 days after receiving delivery of the necessary components, not to exceed 180 days (or 270 days if an industrial process shutdown is required) from the date the refrigerant-containing appliance exceeded the applicable leak rate."
The components cap is the one most often misread. It's a hard ceiling measured from the exceedance date, not from the order date or the delivery date. On a shutdown repair, a part that arrives on day 250 still leaves only 20 days, not 30, because day 270 is the limit.
Requesting the extension
Extensions aren't automatic. The owner or operator "must request an extension from EPA electronically, using the Agency's applicable reporting platform, within 30 days (or 120 days if an industrial process shutdown is required) of the refrigerant-containing appliance exceeding the applicable leak rate." Under 84.106(f)(4), the request includes facility and owner information, the leak rate and calculation method, the date of exceedance, where the leaks are, repairs already made, the reason more time is needed, an estimated completion date, and the signature of an authorized official.
A request filed after the base window closes doesn't recover the time. The notice deadline is the same date as the repair deadline, so the decision to seek an extension has to be made early, usually as soon as a vendor quotes a lead time longer than the window.
| Ground | Repair deadline extension | Retrofit or retirement extension |
|---|---|---|
| Radiological contamination | As needed to repair safely | When a safe working environment needs more than 30 weeks |
| Other regulations | As needed to comply | When they make completion within one year impossible |
| Parts or equipment lead time | Delivery + 30 days; cap 180 days (270 with shutdown) | Custom-built with a quoted delivery over 30 weeks; install within 120 days of delivery |
Per 40 CFR 84.106(f) and (i). Retrofit extensions apply to industrial process refrigeration; all extensions must be requested from EPA.
When Repair Isn't the Answer: Retrofit or Retirement
Instead of repairing, the owner can write a plan to retrofit the appliance to another refrigerant or retire it. EPA's fact sheet requires the plan within 30 days and completion "within one year of the plan's date." The regulation defines retirement as removing the refrigerant and disassembling or impairing the circuit "such that the appliance as a whole is rendered unusable by any person in the future."
For a production-critical process system, one year is often not enough to design, procure, and commission a replacement. The IPR-specific provisions in 84.106(i) address that. Owners of industrial process refrigeration may request more than one year when:
- other federal, state, local, or tribal regulations make completion within one year impossible;
- the new or retrofitted equipment is custom-built and the supplier of the appliance or a component "has quoted a delivery time of more than 30 weeks from when the order is placed," in which case the equipment must be installed within 120 days after the parts arrive; or
- the equipment is in an area with radiological contamination and creating a safe working environment will take more than 30 weeks.
The custom-built route has a follow-on step: after receiving that extension, the owner may request more time if needed, but the request "must be submitted to EPA before the end of the ninth month of the initial extension."
What "custom-built" means
The regulation defines it narrowly: the IPR equipment or a component "cannot be purchased and/or installed without being uniquely designed, fabricated and/or assembled to satisfy a specific set of industrial process conditions." A catalog chiller with a long backorder doesn't qualify. A purpose-designed skid does. Keep the supplier's written lead-time quote, because the 30-week figure has to be supported.
A Planning Timeline for an IPR Exceedance
The dates in the regulation are fixed, so the plant's internal process has to be faster than the regulatory clock. A workable sequence:
| When | Action | Why it can't wait |
|---|---|---|
| Day of the addition | Calculate the leak rate; record the exceedance date | Every deadline counts from this date |
| First week | Leak inspection; decide whether a shutdown is required and document why | Sets whether the 30- or 120-day clock applies |
| As soon as lead times are known | Decide repair versus retrofit or retirement; get written supplier quotes | Extension requests and plans share the same deadline |
| Before day 30 or 120 | Repair and initial verification, or file the extension request, or sign the plan | Late requests don't recover time |
| Within 10 days of initial test | Follow-up verification at normal operating conditions | Confirms the repair holds under process load |
Deadlines per 40 CFR 84.106; the internal sequence is a planning recommendation.
Verification Under Process Conditions
Follow-up verification on process equipment has one complication commercial systems don't: the definition of normal operating characteristics includes process load. The follow-up test is supposed to confirm the repair "after the appliance has returned to normal operating characteristics and conditions," and on an IPR system that means running at a representative process load, not just being energized.
If the plant restarts in stages after a shutdown repair, the 10-day window can be keyed to the appliance reaching normal operating characteristics rather than to the initial test date. Record when that happened and on what basis, such as a load percentage, flow rate, or process temperature at target. That record is what supports the timing if anyone questions it later.
Leak Inspections After the Repair
A successful follow-up verification starts a period of ongoing inspection. Under 84.106, commercial and industrial process refrigeration appliances with 500 pounds or more of charge are inspected "once every three months" until they go four consecutive quarters without exceeding the leak rate. Those under 500 pounds are inspected once a year until they go one year without exceeding it.
Many process systems are well above 500 pounds, so an exceedance usually commits the plant to at least four quarterly inspections. Schedule them into existing maintenance windows at the time of the repair. A certified technician performs them, and each is documented. For budgeting, Get Freon's guide to pricing leak repairs under the new rules shows how to scope the full sequence as defined line items, not just the repair visit.
Automatic Leak Detection on Large Process Systems
The largest IPR appliances need continuous monitoring. The International Code Council's summary of the program states that new commercial and industrial process refrigeration appliances with a full charge of 1,500 pounds or more must have automatic leak detection installed within 30 days of installation, starting January 1, 2026. Existing systems of that size installed between January 1, 2017 and January 1, 2026 must have it by January 1, 2027.
That leaves about three months for existing large process systems. Two points apply to industrial sites:
- Sensor placement follows the process layout. Custom skids, enclosed process areas, and long piping runs need detection designed around where leaks can collect, not a single sensor in a machine room.
- ALD can replace periodic inspections. On systems below 1,500 pounds where it isn't required, a compliant system can stand in for the quarterly or annual inspections, which is worth pricing on any process system that has already been put on quarterly inspections.
Mothballing a Process System
When a line is idled, mothballing pauses the clock. The regulation defines it as evacuating refrigerant from the appliance, "or the affected isolated section or component," to at least atmospheric pressure and temporarily shutting it down. Deadlines are suspended while the appliance is mothballed and resume when refrigerant is added again.
The "isolated section or component" wording is useful on process systems. If a leaking section can be isolated, evacuated, and shut down while the rest of the circuit keeps running, that section can be mothballed on its own. Record the date and the evacuation level, because the clock resumes when the section is recharged.
Reporting a Chronic Leaker
Separate from the 30% trigger, EPA's fact sheet requires a report for any appliance that leaks "125 percent or more of the full charge in a calendar year," due by March 1 of the following year. Trinity Consultants' review of 40 CFR 84 notes that the first reports under the new program are due March 1, 2027, covering calendar year 2026.
The 125% figure is a calendar-year total of refrigerant added divided by full charge, not the leak rate at a given addition. A large process system that has been topped off repeatedly while a shutdown repair was scheduled can cross it even if every individual calculation was handled on time. Check the running total monthly on any system under an open repair clock.
Records to Keep
The owner or operator keeps records for three years, on paper or electronically, per EPA's fact sheet. For an IPR exceedance, the file should include:
- the full charge and the method used to determine it;
- every refrigerant addition, with its leak rate and calculation method;
- the exceedance date and the basis for any claim that a shutdown was required;
- leak inspection findings and the repairs made;
- initial and follow-up verification tests, with the date and basis for reaching normal operating conditions;
- any extension request and EPA correspondence;
- supplier lead-time quotes supporting a components or custom-built extension;
- retrofit or retirement plans, signed and dated, kept on site;
- mothballing dates and evacuation records;
- quarterly or annual inspection results, and ALD records where applicable.
For the general program structure that applies across categories, Get Freon's overview of the HFC leak repair rules and the 20% commercial refrigeration threshold covers the steps shared by all categories.
Frequently Asked Questions
What is the leak rate threshold for industrial process refrigeration?
30% under the AIM Act program for HFC appliances of 15 pounds or more, and 30% under Section 608 for ozone-depleting refrigerants in appliances of 50 pounds or more. Commercial refrigeration triggers at 20%, and comfort cooling at 10%.
Do I need EPA approval to use the 120-day window?
No. The regulation sets 120 days as the deadline whenever the repair requires an industrial process shutdown. You do need to document why a shutdown was required. EPA requests apply only to the separate extensions.
Can the 120-day window be extended further?
Yes, on three grounds: radiological contamination, conflicting regulations, or unavailable components. For components, the maximum is 30 days after delivery and no more than 270 days from the exceedance when a shutdown is involved. The request must be filed electronically within the 120 days.
Does a long lead time on a standard chiller qualify for the custom-built retrofit extension?
No. Custom-built means the equipment or component can't be bought or installed without being uniquely designed, fabricated, or assembled for specific process conditions. The supplier must also have quoted a delivery time of more than 30 weeks.
Which systems in a plant count as IPR?
Appliances directly linked to the production process, such as reactor, solvent-recovery, and process-cooling systems. Office air conditioning is comfort cooling, and on-site cold storage may be commercial refrigeration, each with its own trigger.
Are ammonia systems covered?
No. The program covers HFCs and substitutes with a GWP above 53, and ammonia's GWP is below that line.
Where does monitoring fit?
Automatic leak detection is required on new IPR appliances of 1,500 pounds or more within 30 days of installation, and on existing systems of that size installed from 2017 through 2025 by January 1, 2027. On smaller systems it's optional and can replace periodic inspections.
When is the first chronic-leaker report due?
March 1, 2027, for appliances that leaked 125% or more of their full charge during calendar year 2026.
Keeping the Clock Ahead of the Process
The IPR provisions don't give a system more time because it's industrial. They give it time proportional to what a repair actually requires: 30 days when the process can keep running, 120 when it can't, and documented extensions when parts, other rules, or custom engineering stand in the way. Each of those windows starts on the day refrigerant goes in and the leak rate is calculated, so the plants that use them well record that date immediately and plan the shutdown before the deadline is close.
