Hello neophyte and thank you for your question.
Installation guidelines for the Generac 7kW Automatic Backup Power System can found here: http://www.homedepot.com/catalog/pd...
Clearance from the ends and front of the generator should be 36” minimum per NFPA 37. This includes shrubs, trees and any kind of vegetation. Clearance at the top should be a minimum of 60 inches from any structure, overhang or projections from the wall. The generator should not be placed under a deck or other structure that is closed in and would limit or contain air flow.
No windows or openings in the wall are permitted within 5 feet from any point of the generator. Place the unit so air vents won’t become clogged with leaves, grass, snow or debris. Make sure exhaust fumes will not enter the building through eaves, windows, ventilation fans or other air intakes.
Power derating may occur depending upon the cabling used - local codes will prevail – please contact a local professional installer for more specific information about your area.
Best wishes on your project.