I still think twice the bandwidth of the 40x40x10mm module I bought from Wathai isn't bad for the configuration I envisioned. But the noise level is probably even more unstable than the 40x40x20 bought from them a year ago? I would recommend a possible 40 x 40 x 15mm modular upgrade, perhaps to overcome some of the vibrations of noise level instability and perhaps also to increase airflow by a few cubic feet per minute.
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