SSI exemption for manufacturers availing CENVAT credit permits concessional duty relief on initial clearances subject to conditions. The notification grants an exemption on excise duty for specified goods cleared for home consumption by manufacturers availing CENVAT credit, reducing duty above an amount computed at concessional rates for initial clearances up to an aggregate threshold per financial year, and providing nil duty for specified in factory input clearances. Eligibility requires a written option notified to authorities prior to first clearance and counts prior clearances in the financial year toward the aggregate limit; exclusions, brand restrictions with limited exceptions, valuation rules, and turnover ceilings apply.