EPA Tier 2 vs Tier 3 vs Tier 4 Final: Diesel Generator Emission Standards Explained
Few spec-sheet lines cause more confusion — and more failed permit applications — than the EPA tier rating. Buy a Tier 2 generator for a peak-shaving program and you own an expensive paperweight. Pay Tier 4 Final money for a pure emergency standby unit and you may have overspent by 30–50%. This guide explains what each [...]









