$50 · Hydrofarm Active Air 4 Inch in-Line Fan with 4" x 18" Filter

I am not the original owner of these but can confirm that the fan works properly with strong pull and low noise. I am not sure how much use the filter has had but it looks to be in good condition, not clogged or soiled. Fan is, per the title, the Hydrofarm Active Air 4" and the filter is a "Can-Filter" and I believe a charcoal with pre-filter.