The base makes the entire setup a lot more sturdy while the top improves that and help with sealing for even better airflow.
The exact filters I used are https://www.amazon.com/Komashr-Replacement-Defense-Comparable-1500-1900-11-75x11-75x0-75/dp/B0FGJFHV97
The exact fan I used https://www.amazon.com/Meozri-Ventilation-High-Speed1460-Industrial-Commercial/dp/B0DCDTQ24V
Filters last somewhere around 6 months with continuous use.
One nice trick once you slot the filters in the base is to use some masking tape to align them to each other on top and to seal any cracks between them (see the pictures).
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