BYD Cabin Air Filter SA-8121211 / 12447996-00 – BYD e5 EV450 (2018), Qin 1.5 (2019), Qin EV450 (2018–2021) delivers EV-optimized airflow with high-efficiency pleats that capture fine particulates without burdening the blower, preserving range and quietness. A sturdy, moisture-stable frame and precise sealing geometry prevent bypass leaks to keep ducts and evaporators clean. Select activated carbon to aggressively reduce urban odors and ozone. Clear airflow arrows and a drop-in design speed up glovebox servicing for a confident DIY swap. Replace yearly or at 15–20k km based on climate and usage. Enjoy cleaner air, faster defogging, and reliably fresh cabins across compatible BYD models.