If the holes are very large, then ordinary plasticine will come to the rescue.
Also if there is a large distance between the frames, then it can be filled with the same cotton wool or, at worst, rags. This will greatly reduce heat loss.
If the holes are very large, then ordinary plasticine will come to the rescue.
Also if there is a large distance between the frames, then it can be filled with the same cotton wool or, at worst, rags. This will greatly reduce heat loss.
