AHRI 1060 at a Glance
AHRI Standard 1060, Performance Rating of Air-to-Air Exchangers for Energy Recovery Ventilation Equipment, is the North American rating method that lets engineers compare energy recovery devices on a level playing field. It applies to fixed-plate, enthalpy-wheel, heat-pipe, and run-around-coil air-to-air exchangers used in commercial and institutional ventilation.
What the Standard Rates
Rather than quoting a single marketing number, AHRI 1060 defines a family of performance metrics measured at standard rating conditions:
| Metric | Meaning |
|---|---|
| Sensible effectiveness | Temperature energy transferred ÷ ideal temperature difference |
| Latent effectiveness | Moisture transferred ÷ ideal humidity difference |
| Total (enthalpy) effectiveness | Combined heat + moisture recovery |
| Pressure drop | Fan energy penalty on supply and exhaust sides |
| Sensible / enthalpy leakage | Unwanted cross-contamination between streams |
Standard Rating Conditions
The standard defines a summer and a winter condition so that both cooling-dominated and heating-dominated climates are represented. Typical inputs include supply and exhaust airflows (often 1,000 cfm per side in the laboratory), entering dry-bulb and wet-bulb temperatures on each airstream, and face velocities consistent with field practice. Effectiveness is reported at the rated airflow, not at the single most flattering point.
Why a Single Rating Method Matters
- Apples-to-apples comparison – a plate exchanger and an enthalpy wheel are scored the same way.
- Bypass and leakage quantified – the standard reports how much supply air leaks to exhaust (and vice-versa), which is critical for lab, hospital, and kitchen applications.
- Fan penalty visible – pressure drop is part of the rating, so the net energy balance is honest.
Certification and the AHRI Directory
Manufacturers may certify their equipment through the AHRI certification program. Certified ratings are published in the AHRI directory, giving specifiers confidence that the unit they select matches the unit that ships. When a project references "AHRI 1060 certified," it means the published effectiveness and pressure drop were verified against this method.
Using AHRI 1060 in Selection
Start from the building's design outdoor-air load, then read the winter sensible effectiveness to size heating recovery and the summer total effectiveness to size cooling recovery. Always add the rated pressure drop to the fan brake-horsepower calculation. For humid climates, weigh latent effectiveness heavily; for clean, dry exhaust, a fixed plate may beat a wheel on first cost and maintenance.
Relationship to Other Standards
AHRI 1060 provides the numbers; ASHRAE 90.1 decides when recovery is required; and ASHRAE 62.1 sets how much outdoor air the system must deliver. Together they form the decision chain for specifying an energy recovery ventilation unit.
Worked Example: Comparing Two Wheels
Suppose a specifier evaluates two enthalpy wheels for a 5,000 cfm per side unit. Wheel A is rated at 78% sensible / 68% latent effectiveness with 0.7 in. w.g. pressure drop. Wheel B is rated at 72% sensible / 60% latent with 0.5 in. w.g. pressure drop. Using AHRI 1060 numbers:
- Wheel A recovers more energy but costs more to run in fan power (higher drop).
- Wheel B saves fan energy but recovers less conditioning energy.
- In a humid climate the latent gap (68% vs 60%) often outweighs the fan saving, so Wheel A wins on total energy.
The point of AHRI 1060 is that both are quoted the same way, so the choice is a real engineering trade rather than a brochure comparison.
Frequently Asked Questions
Is AHRI 1060 the same as ASHRAE 84? They are different documents but measure the same quantities; AHRI 1060 is the North American rating standard, ASHRAE 84 the test method. Ratings are broadly equivalent.
What does "certified" mean? It means a third party verified the published effectiveness and pressure drop against the standard, and the model appears in the AHRI directory.
Does pressure drop matter? Yes — it is part of the rating and directly adds fan horsepower, so a device with great effectiveness but high drop may save less net energy.
Should I trust the catalogue number? Only at your design airflow and condition; effectiveness falls as face velocity rises, so match the rating point to the operating point.