Carbon filter optimal airflow 240 m3/hI've read with too much airflow/fan speed the smell doesn't get scrubbed out properly.
Filters are rated @ single pass thru. This means that your filter @ 240 cfm is not enough for your 197 cfm fan. You need double the filter cfm compared to your fan cfm in order to work well and block odor.Carbon filter optimal airflow 240 m3/h
My fan 197 m3/h