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White cylindrical marine blower with flexible mounting bracket and electrical terminals

JABSCO

JABSCO 4" Flexmount Blower 115VAC 250 CFM 36770-0115 accessory

SKU CH-XNMZ-CN5F0

A 115 VAC direct-drive blower delivering 250 CFM at zero static pressure for marine ventilation

  • Delivers 250 cfm airflow at zero static pressure for strong ventilation
  • Maintains 245 cfm at 0.100 in SP for real-world duct runs
  • Provides 238 cfm at 0.400 in SP to overcome filter resistance
  • Supplies 230 cfm at 0.500 in SP for longer duct lengths
  • Still moves 200 cfm at 1.000 in SP under high system restriction

Marine ventilation blower

The Jabsco Flexmount blower delivers 250 cfm at zero static pressure for engine-room and bilge ventilation on commercial and recreational vessels. Direct-drive construction eliminates belt maintenance while the forward-curved wheel maintains output through duct runs. The unit ships fully assembled and operates on 115 VAC supply.

Upgrade from belt-driven blowers

Installers replacing belt-driven units gain a lighter, shorter package that fits existing 4-inch ductwork without pulley alignment. The jump is worthwhile when engine-room access is tight and downtime for belt changes is costly. At 0.500 in SP the blower still moves 230 cfm, covering most retrofit installations.

Capacity and headroom

At 0.100 in SP airflow measures 245 cfm, dropping to 238 cfm at 0.400 in SP and 200 cfm at 1.000 in SP. Heavy duct systems with multiple bends may see output near 100 cfm at 2.000 in SP, so designers should verify total system resistance before specifying.

Highlights

  • Delivers 250 cfm airflow at zero static pressure for strong ventilation
  • Maintains 245 cfm at 0.100 in SP for real-world duct runs
  • Provides 238 cfm at 0.400 in SP to overcome filter resistance
  • Supplies 230 cfm at 0.500 in SP for longer duct lengths
  • Still moves 200 cfm at 1.000 in SP under high system restriction

Specifications

BrandJabsco

Questions about this item

What duct size and mounting clearance does the 4 1/2 in wheel diameter blower require?

The unit uses a 4 1/2 in wheel diameter and Flexmount design; match ductwork to the 4 in nominal size and allow space for the motor housing and vibration movement during operation.

How do I wire the 115VAC direct-drive blower and what step is often missed?

Connect the 115VAC supply to the motor leads following local codes; the commonly missed step is securing the flexible mount brackets before tightening duct clamps so alignment stays true under vibration.

When should I inspect or replace the forward-curved wheel on this 250 CFM blower?

Inspect the forward-curved wheel annually or when airflow drops below the 230 CFM at 0.500 in SP benchmark; replace if blades show cracking, corrosion or imbalance causing noise.

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