AirSelect3D Blog
AHU engineering, selection
and compliance — explained.
Practical articles on air handling unit selection, Eurovent ECP-05-2026 certification, ErP compliance, specific fan power, heat recovery and acoustics — written by the team building AirSelect3D.
AHU Technical Data Sheet — What Consultants Check (Free PDF Example)
The exact data a bureau d'études expects on an AHU technical data sheet — ErP 1253/2014, ECP-05-2026 class, EN 1886, acoustics — with a full 15-page example PDF to download.
Octave-Band Sound Power in AHUs — How LwA Totals Are Really Summed
How octave-band sound power levels are logarithmically summed and A-weighted into the LwA figure consultants ask for - with a full worked example.
Plate vs Rotary Heat Recovery: Efficiency, Leakage, Frost Strategy
Plate vs rotary heat recovery compared on EN 308 efficiency, EN 13053 leakage classes and frost risk — a climate-based selection guide for AHU sales engineers.
AHU Filter Classes After ISO 16890 — ePM1, ePM2.5 and ePM10 Explained
ISO 16890 replaced EN 779 - what ePM1, ePM2.5 and ePM10 really measure, and which filter class to specify for offices, hospitals and industry.
Face Velocity — the One Number That Sizes Your AHU Casing (and Your SFP)
Face velocity (v = q/A) drives casing size, coil selection, filter life and SFP in AHUs - target ranges per component and the real trade-offs.
Regulation (EU) 2024/1834: Fan Ecodesign Rules for AHUs, 2026–2027
Regulation (EU) 2024/1834 replaces 327/2011 - new fan efficiency minimums, fewer exemptions, and the 2026/2027 deadlines that decide AHU fan selection.
How to Choose AHU Selection Software in 2026 — a Buyer's Checklist for OEMs
A practical 2026 checklist for OEMs choosing AHU selection software - vendor data fidelity, live Eurovent/ErP compliance, 3D design and export formats.
Eurovent ECP-05-2026 and ErP for AHUs — the Compliance Guide Sales Engineers Actually Need
A practical guide to Eurovent energy classes, winter and summer fs-Pref ratios, ErP/NRVU requirements and what an auditable AHU dossier must contain in 2026.
Specific Fan Power (SFP) Explained — EN 16798, SFP_int and Why Your AHU Quote Depends on It
SFP = fan power / airflow in W/(m3/s). How SFP_int is calculated under EN 16798 and ErP, typical class values, and how to stay under the threshold.
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