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The original was posted on /r/crboxes by /u/jhsu802701 on 2023-09-22 17:57:16.

The Corsi Rosenthal box is a genius idea that I wish I had thought of.

In my opinion, some details should be changed:

• Painter’s tape should be used instead of duct tape. Duct tape leaves a sticky residue. Painter’s tape can be removed much more easily and cleanly, which will make it much easier to replace the filters.
• The cardboard piece at the bottom should be wrapped in a layer of tape. (I use clear packing tape to distinguish it from the painter’s tape.) This layer of tape protects the cardboard from damage when it’s time to replace the filters.
• Pre-filters should be added on top of the MERV-13 filters. This outer layer consists of the cheapest and lowest grade filters available (MERV 8 or lower) and protects the inner layer from larger particles. This minimal investment saves money because it means that the more expensive MERV-13 filters last longer before having to be replaced.