The pad only extends very slightly beyond the dimensions of the generator itself. The dimensions of the unit (with the pad) are 48.3" long x 25.3" wide. Regardless of whether you are installing the unit on pea gravel or on a concrete pad (the selection of which depends upon your local building codes), you can keep the generator on the composite pad.
For additional information about site preparation, please see the installation guide (http://goo.gl/IRJDj
answered 2 years, 8 months ago