Histogram correction. You may notice that the histogram and bell curve is a little out of sync, this is due to the way the bins widths and frequencies are plotted. If you have a bin width of 20, and the bin value is 40, the corresponding frequency is all values between 20 and 40.
I had my replaced for $150 last year (It is my third Radiator). Here is the JC Whitney Catelog for Radiators (Please note Installation will be extra): http://www.jcwhitney.com/webapp/wcs/stores/servlet/Prod...
A contractor will charge $308 to install a 14-inch power ventilator which includes the labor and material; you can do it for more than half and pocket a 57 percent savings.or about $130 you can buy what you need: a power ventilator, an electrical box and cover, a short piece of three-wire BX or Romex cable, a package of wire nuts and a quart of roofing cement.