Why Standards Matter for Heat Recovery
Energy-recovery equipment is only as good as the test that proves it. Buyers, specifiers and code officials do not take effectiveness numbers on faith - they rely on published standards that define how recovery performance is measured, what minimum thresholds apply, and which certification marks confirm compliance. This hub indexes the standards that govern air-to-air heat recovery and turns them into a practical compliance checklist you can hand to a design team.
Start from the fundamentals in our heat exchanger basics hub, then return here for the regulatory layer that sits on top of the physics.
The Standards Landscape at a Glance
| Family | Region / Scope | What it governs | Key reference |
|---|---|---|---|
| EN 308 / EN 13053 / EN 16798 | Europe (CEN) | Test method for heat transfer, rating of air-handling units, ventilation & building energy performance | EN 308 test method |
| ASHRAE 62.1 / 84 / 90.1 | USA / global reference | Ventilation rates, thermal performance test, energy-standard recovery requirements | ASHRAE 62.1 |
| ISO 9229 | International | Thermal-insulation vocabulary - the language every other standard uses | ISO 9229 vocabulary |
| AHRI 1060 | North America | Performance rating of energy-recovery ventilators (ERV/HRV) | AHRI 1060 rating |
| ErP Lot 6 / Eurovent | EU market + certification | Ecodesign requirements for ventilation; third-party certification of recovery units | ErP Lot 6 |
European Standards (CEN)
The EU stack is the most complete and is the de-facto baseline for exported equipment.
- EN 308 - Heat Exchanger Test Methods - the lab procedure that turns a measured temperature rise into a rated effectiveness. Our EN 308 testing explainer walks through how that rating maps to field performance.
- EN 13053 - Rating of Air Handling Units - covers AHUs including the integrated heat-recovery section, so the core is rated inside the unit, not in isolation.
- EN 16798 - Energy Performance of Buildings (Ventilation) and EN 16798 building energy performance define the ventilation and indoor-environment criteria that drive when recovery is mandatory.
ASHRAE Standards (USA & Global Reference)
- ASHRAE 62.1 - Ventilation for Acceptable Indoor Air Quality - sets the outdoor-air rates that make recovery economically necessary in tight buildings.
- ASHRAE 84 - Measuring Thermal Performance of Energy Recovery - the North American counterpart to EN 308 for rating recovery devices.
- ASHRAE 90.1 - Energy Recovery Requirements - the energy standard that mandates recovery above defined airflow and climate thresholds.
International Vocabulary & Certification
- ISO 9229 - Thermal Insulation Vocabulary - the shared terminology (effectiveness, recuperator, regenerator) that keeps every other standard unambiguous.
- Eurovent Certification for Air-to-Air Heat Recovery Units - independent verification that a unit performs as rated, increasingly required by European specifiers.
- AHRI 1060 - Performance Rating of Energy-Recovery Ventilators - the certification basis most North American ERV/HRV data sheets quote.
- ErP Ecodesign Lot 6 for Ventilation - the EU ecodesign regulation setting minimum efficiency for ventilation units with heat recovery.
How to Read a Test Report
A compliant datasheet should state the test standard, the airflow, the entering temperatures, and whether the figure is sensible-only or total (latent included). Compare the vendor's claim against the method in EN 308 or ASHRAE 84 - if the standard is not named, the number is not comparable. Our effectiveness ratings guide explains how to interpret the percentages.
Compliance Checklist by Market
- European Union - confirm ErP Lot 6 minimums, reference EN 308/EN 13053 ratings, and prefer Eurovent-certified units for public tenders.
- United States - verify ASHRAE 90.1 recovery thresholds are met, quote AHRI 1060 ratings, and design ventilation to ASHRAE 62.1.
- Global / Export - anchor on ISO 9229 terminology, then map local code back to EN or ASHRAE equivalents.
Frequently Asked Questions
Is EN 308 the same as ASHRAE 84? They are separate standards but measure the same thing - recovery effectiveness under defined conditions. A unit rated to one can usually be re-rated to the other; what matters is that a named method is used.
Do I need Eurovent certification? Not legally everywhere, but many EU public and commercial specs require it as proof the claimed effectiveness is real.
When does ASHRAE 90.1 force recovery? Above specific airflow and climate-index thresholds; our ASHRAE 90.1 recovery requirements article details the cut-offs.
Related Hubs
Heat exchanger fundamentals · Compare technologies · Sizing and selection
Need a Compliant Specification?
If your project must meet EN, ASHRAE or ErP requirements, our engineers can supply units with the correct ratings and certification. Use the sizing and selection guide to scope duty, then send us your airflow, temperature and humidity data for a standards-ready recommendation.