Rule 240 Inline Bilge Blower - 102mm

The Rule 240 is a 12V inline marine ventilation blower for 102 mm (4 in) ducting, delivering 235 CFM (6.7 m³/min) open airflow with a 4.3A draw and 7A recommended fuse.

The Rule 240 inline blower is designed to move air through marine ventilation ducting in bilges, engine compartments, galleys and heads. It uses slip-on duct connections, a sealed motor shaft and corrosion-resistant nickel-plated motor housing for permanent boat installations.

Product Identification

• Brand: Rule
• Product name: Rule 240 Inline Bilge Blower - 4"
• Model / part number: 240
• Marine Scene SKU: CW-240
• Product category: Inline marine ventilation blower
• Voltage: 12V DC
• Open airflow: 235 CFM (6.7 m³/min)
• Duct size: 102 mm (4 in)
• Current draw: 4.3A
• Recommended fuse: 7A
• Ignition protection: Yes; USCG 183.410 compliant
• Quantity supplied: One blower

What Is the Rule 240 Bilge Blower Used For?

This blower is used to ventilate enclosed marine spaces and help remove accumulated vapours, heat and stale air through a correctly designed 102 mm duct system. It moves air only and must not be used as a liquid pump.

What Is Included?

• One Rule 240 inline marine blower

What Is Not Included?

• Ventilation ducting, clips and outlet grilles
• Control switch, cable extensions and waterproof connectors
• 7A fuse and mounting hardware not supplied in the retail package

Which Marine Ventilation Systems Is the Rule 240 Compatible With?

• For 12V DC marine electrical systems.
• Connects to 102 mm (4 in) ventilation ducting.
• Mount on a secure flat surface in the direction of the required airflow.
• Use switching, cabling and a fuse rated for the 4.3A blower load and total cable length.

How Should the Blower and Ducting Be Selected?

Match the blower to the complete ventilation system rather than using airflow alone:

• Supply voltage: 12V DC
• Duct diameter: 102 mm (4 in)
• Published open airflow: 235 CFM (6.7 m³/min)
• Current draw: 4.3A
• Recommended fuse: 7A
• Installed space: 102 x 152 x 106 mm (H x W x D)

Construction and Design

• Motor housing: Corrosion-resistant nickel-plated housing
• Shaft protection: Front and rear shaft seals
• Ignition protection: Yes; USCG 183.410 compliant
• CE compliance: Yes
• Dimensions: 102 x 152 x 106 mm (H x W x D)

Installation and Safety

Install the blower and ducting in accordance with the vessel manufacturer’s ventilation plan and applicable marine regulations. Keep duct runs as short and unrestricted as practical, orient the airflow correctly, protect the circuit with a 7A fuse and test airflow before operating an engine or equipment that may produce vapour. The blower is ignition protected but is not a substitute for correct fuel-system maintenance or vapour checks.

Maintenance

Check the ventilation system regularly to confirm that air can move freely through the intake, blower and ducting.

• Remove obstructions from grilles and ducts.
• Inspect the blower housing, mounting, fuse and wiring.
• Check duct joints for collapse, leakage or detachment.
• Replace a blower that is noisy, damaged or fails to deliver normal airflow.

Key Features

• 235 CFM (6.7 m³/min) open airflow
• 12V DC operation
• 4.3A current draw and 7A recommended fuse
• 102 mm (4 in) slip-on duct connections
• Sealed motor shaft for moisture protection
• Corrosion-resistant nickel-plated motor housing
• Ignition protected and CE compliant

Frequently Asked Questions

Is the Rule 240 a bilge-water pump?
No. It is an air blower for ventilation ducting.

What duct size is required?
Use 102 mm (4 in) ventilation ducting.

Can it be used on a 24V electrical system?
This listing is for model 240, the 12V version. Use the separately specified 240-24 model for 24V systems.

Does the quoted airflow account for duct resistance?
No. The 235 CFM figure is an open-flow rating. Long, narrow or sharply bent ducting reduces installed airflow.

Specifications