Re: Measuring Attic Space For Fan
To find the volume of a pyramid, multiply the area of the base X height X 1/3.
Can't answer the question about Whirlybirds, the main thing is that you want good convective airflow (cool in from the bottom, hot exhausts out the top ). You will need to add venting at the soffit or base of the walls, if you don't have that already if you want to see benefit from a roof vent. A more attractive option would be to install an eyebrow vent.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!