Detmar Blowers
Detmar In-Line Blowers: Purpose-Built Marine Ventilation
When it comes to keeping a boat's engine compartment, galley, or bilge free of flammable vapors and excess moisture, few names carry as much credibility as Detmar. Marine blowers are not an optional accessory — proper ventilation is a fundamental safety requirement for any inboard-powered vessel, and Detmar has spent decades engineering products to meet that standard with precision.
Detmar Corporation, based in Detroit, Michigan, has been designing and manufacturing OEM and proprietary marine components since 1957. Blowers are among the company's flagship product lines, and the engineering behind them reflects that long-standing commitment to reliability in demanding environments.
The Detmar Tunnel Blower Design
Detmar's in-line blowers use a distinctive tunnel design that sets them apart from conventional units. These blowers place the motor in the center of the airflow, which keeps the motor running cooler and results in a lower amperage draw — a meaningful advantage on a 12V DC marine electrical system. Internal vanes within the blower housing direct airflow to reduce turbulence, increase efficiency, and boost overall output.
At the heart of Detmar's performance advantage is a pioneering impeller design. Detmar raised in-line blower performance standards by engineering a five-blade, bullet-nosed impeller paired with cambered stator vanes that deliver high pressure with minimal air turbulence. The result is some of the highest rated air capacity available in this product category — the 3" blower produces 158 CFM and the 4" blower reaches 240 CFM, both measured at 13.6 VDC specification voltage.
Model Options: 3" and 4" Tunnel Blowers
Detmar offers two primary tunnel blower sizes to accommodate a range of installation requirements. The 7-5-4C and 7-5-1C series provide coverage from 138 CFM for the 3" intake/exhaust configuration up to 223 CFM for the larger 4" models — ideal for ventilating galleys, heads, and engine compartments across a wide variety of vessel types. All models run on 12V DC power and are designed for continuous-duty operation.
The blower housing is molded from tough, corrosion-proof ABS plastic with built-in mounting brackets for simplified installation and quieter operation. Molded tabs on hose flanges ensure positive, secure hose connections even under vibration.
Safety Standards and Compliance
Every Detmar blower is built and tested to rigorous standards that include salt spray corrosion resistance, humidity resistance, vibration and shock resistance, and low- and high-temperature performance. All models are ignition-protected, NMMA Type Accepted, and compliant with USCG Safety Standards including ABYC H-2 and U.S.C.G. 33 CFR sections 183.410, 183.425, and 183.610 — the regulations governing ventilation systems for gasoline-powered boats.
Detmar also offers Water-Resistant models for high-moisture applications where additional protection is needed. Standard models are backed by a one-year limited warranty, while Water-Resistant models carry an extended three-year limited warranty.
Why Choose a Detmar Blower?
- Highest rated air capacity in the in-line blower segment
- Five-blade, bullet-nosed impeller with cambered stator vanes for efficient, low-turbulence airflow
- Ignition-protected, NMMA-approved, and USCG-compliant
- Corrosion-proof ABS housing engineered for harsh marine environments
- Standard and Water-Resistant models available
- Optional custom wire lead connections for OEM boat harness integration
Whether you are replacing an aging blower on an inboard runabout or specifying components for a new build, Detmar's in-line tunnel blowers represent a well-proven, safety-certified choice. Browse the full Detmar brand catalog or explore all marine blowers to find the right fit for your vessel.