We have recently moved house and currently have an open fireplace -
something we didn't have before. Our cats are very interested in the
opening and on one occasion one of the cats ran up the chimney - in fright -
and it was a few hours before she finally emerged...filthy!
We are not going to use the fireplace for an open fire and would like to
block off the opening. Does anyone have any experience of chimney balloons
as we have heard that these are quite effective?