Eric Aune walks through his decision to add an inline filter box ahead of his ERV's existing intake filter. Living near active gravel mining, he's watching his Merv 8 pre-filter turn black monthly — a sign the ERV core itself is taking a beating. His solution is a six-inch ducted filter box housing a 10x20 Merv 13 filter, roughly doubling the filtration surface area. The larger filter handles finer particulate matter, maintains manageable static pressure longer between changes, and keeps the ERV's internal core cleaner over time. He also covers insulating the box to prevent condensation when drawing in cold outdoor air.

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