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

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

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