This NRF Heater Matrix, part number 54291, is a high-quality heat exchanger designed for interior heating systems. It features brazed cooling fins and has a core length of 167 mm, a core width of 171 mm, and a core depth of 26 mm. This part is compatible with several OEM references, including Hyundai 9721422900, 9722122000, and 9722122001. It is also listed with cross-references from other manufacturers such as 4SEASONS, AKS DASIS, HELLA, MAHLE, and VALEO. This heater matrix is suitable for various Hyundai models, including the ACCENT I (X-3) and ACCENT LC, with specific engine and production year compatibility noted in the detailed fitment information.