Building dust is visible inside the heat exchanger as the filter doesn’t fit properly – this will damage the heat exchanger Published 8 May 2019 at 2048 × 1536 in How the price of an MVHR relates to quality and performance Building dust is visible inside the heat exchanger as the filter doesn’t fit properly – this will damage the heat exchanger Building dust is visible inside the heat exchanger as the filter doesn’t fit properly – this will damage the heat exchanger Next →