How to specify cleanroom FFU noise—dB distance, duty-point speed, EC vs AC, filter loading, and inquiry language that prevents “quiet on paper, loud on site.”
Compare HEPA H13/H14 vs ULPA in cleanroom FFUs—EN 1822, MPPS efficiency, pressure drop, ISO class pairing, and how to avoid low-airflow failures after a filter upgrade.
Compare external-rotor vs internal-rotor FFU fans—compact depth, airflow, noise, DC 310/400 platforms, and how to select by duty point rather than architecture labels.
Step-by-step FFU selection for ISO cleanrooms—coverage ratios, ACH, module size, EC vs AC, HEPA/ULPA, and an inquiry checklist that gets accurate quotes.
Compare AC vs EC/DC motors in cleanroom FFUs—efficiency, speed control, noise, group control, and when EC payback typically lands in the 2–3 year range for large fleets.
Compare cleanroom FFU sizes—1175×575, 1175×1175, 1175×875, and 615×615—by ceiling grid, airflow, DC 310/400 fans, and ISO coverage needs.
An FFU (Fan Filter Unit) is a ceiling module with a fan and HEPA/ULPA filter that supplies filtered laminar air to cleanrooms. Learn how FFUs work, how they differ from AHUs, and what to compare when you select one.
Calculate how many FFUs you need using ACH or ISO coverage ratios—worked examples for 1175×1175 and 615×615 modules, plus margin for filter loading.
