I think that theory is from the old days of big brick chimmneys?
Sparrows would be doing bloody well to fly virticaly up 6m of 5-6inch flue?
Type: Posts; User: veitnamcam
I think that theory is from the old days of big brick chimmneys?
Sparrows would be doing bloody well to fly virticaly up 6m of 5-6inch flue?