ON 20100812@10:14:54 AM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/other/solar/chimpower.htm#40177.7420601852 James Newton[JMN-EFP-786] published post 40177.7420601852 alahly_stars@yahoo.com asks: " how can i make difference in temperature between the top and bottom of the chimney" |Delete 'P-' before: '' but after: '