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Hi thanks, thats the sort of thing i was thinking of doing, the old system entry point for the air was through the ground under where the HVAC system originally sat so I'm left with a large hole in the floor in a cupboard, just wondering if you had the same and if you filled with concrete as i...

Just after some advice, i have inherited my granddads house which has now got central heating but the old air vents for the warm air heating which has been removed are still there, just wondering how is best to fill and seal the ducting as it runs throughout the ground floor under concrete and...