Table B-1. Table of Class Lives and Recovery Periods Table B-1. Table of Class Lives and Recovery Periods Summary: This table lists the recovery periods (in years) for specific depreciable assets used in all business activities except as noted. The table lists the asset class, description of asset, the recovery periods for: Class Life (in years), General Depreciation System (Modified Accelerated Cost Recovery System) and Alternative Depreciation System. This section lists the asset classes of 00.11--Office Furniture, Fixtures, and Equipment to 00.4--Industrial Steam and Electric Generation and/or Distribution Systems.