I still think the 40x40x10mm dual airflow capacity mod I bought from Wathai isn't bad for the configuration I had in mind. 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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