ISO 13348:2007

Overview - ISO 13348:2007 (Industrial fans)

ISO 13348:2007 specifies performance tolerances, methods of conversion and technical data presentation for industrial fans of all types. It clarifies how fan performance is declared and transferred between test conditions and contract/operating conditions, improving consistency and reducing dispute between suppliers and purchasers. The standard excludes low‑volume household circulation fans (ceiling, table, extractor fans) and refers jet fans to ISO 13350. It also notes an upper practical limit of fan work per unit mass (normally 25 kJ/kg, ≈30 kPa at mean density 1.2 kg/m3) unless otherwise agreed.

Key topics and technical requirements

• Scope and definitions: Terms, symbols and units for fan performance (pressure, flow, power, sound, Mach factor, etc.).
• Installation categories: Uses the four ISO 5801 installation categories - A (free inlet/outlet), B (free inlet/ducted outlet), C (ducted inlet/free outlet), D (ducted inlet/outlet) - which affect performance declaration.
• Performance tolerances:
  • Rules for purpose‑designed fans and for series‑produced (catalogue) fans.
  • Separate treatment for series‑produced fans in certified ratings programmes, referencing AMCA rules for certified data verification.
  • Tolerance grades and the concept of tolerance zones and characteristic error for contractual clarity.
• Methods of conversion:
  • Procedures to convert air performance and sound power measured under test conditions to stated contractual operating points (including fan laws and correction methods).
• Technical data presentation:
  • Requirements for fan performance charts, essential and additional information, documentation and marking (Annexes cover documentation and marking).
• Related measurement standards referenced (normative): ISO 5801, ISO 5802, ISO 13347‑1, ISO 14694, ISO 14695.

Practical applications - who uses ISO 13348

• Fan manufacturers: to declare catalogue performance and set contractual tolerances for bespoke fans.
• System designers and HVAC engineers: to interpret fan curves, convert test data to in‑system performance and select appropriate installation categories.
• Procurement/specification writers: to write clear performance and tolerance clauses into purchase contracts.
• Test laboratories and certification bodies: to apply conversion methods and check‑test procedures, and to verify data under certified ratings programmes.
• Facility operators and consultants: to compare declared vs expected performance and resolve disputes.

Related standards

• ISO 5801 (fan performance testing using standardized airways)
• ISO 5802 (performance testing in situ)
• ISO 13347‑1 (fan sound power determination)
• ISO 14694 / ISO 14695 (balance, vibration and measurement)
• AMCA certified ratings programme (referenced for certified catalogue fans)

ISO 13348:2007 is essential when clear, auditable fan performance data and contractual tolerances are required - improving reliability of fan selection, procurement and in‑service performance verification.