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I have a floor to ceiling glazed porch that's closed and there's an air brick inside that leads to the cellar. During the winter when it's cold, the glazing facing the air brick is always most steamed up. The rest of it gets slightly steamed up too but no where near as much. Is the air from the cellar causing this? Does anyone know if it's ok or recommended to cover this?

Hi angelfish,
The air coming out of the cellar will be relatively warm and certainly damp in comparison to that in the porch.
You could duct the air to outside the porch or form a new air vent outside the porch and seal up the one in the porch.
Regards S