Rule 3" In-Line Blower

The Rule 3" In-Line Blower is a high-output ventilation solution designed for engine bays, bilge spaces, and enclosed automotive compartments where moisture and fumes accumulate. This blower is essential for boats, RVs, and vehicles with sealed or partially sealed engine compartments that trap humidity and exhaust vapors.

Built by Rule, a trusted name in marine and automotive ventilation, this 3-inch inline blower delivers consistent airflow through flexible ducting or hard-pipe installations. Its design allows for flexible positioning, enabling installation anywhere along your ventilation path, whether as intake, exhaust, or circulation.

This blower is particularly valuable for custom automotive builds, engine swaps, and restoration projects where original ventilation systems prove inadequate. Technicians commonly use it to prevent heat soak in engine bays after high-load driving and manage moisture in sealed fuel cell compartments.