wrote:

I need for approximately a 20 feet by 20 feet square.

That's about 6,1m x 6,1m. Assuming you make it 0,15m high, you get about
5,6 cubic meters.

BTW: Don't believe the other posters that do their math in feet and
yard, these are _illegal_ units! :-P


Nick

--
Motormodelle / Engine Models:
http://www.motor-manufaktur.de
Ellwe 2FB * VTM 87 * DLM-S3a * cubic
more to come ...