Marine Duty Fans and Blowers
Your marine fan spec hits a 14-week lead time from one manufacturer. The vessel schedule doesn’t move.
You need an alternative source that meets the same IEEE 45 and USCG requirements without rewriting your specification.
Knape Associates supplies Hartzell marine duty fans as our primary marine line, with additional sourcing relationships across multiple manufacturers for interior vessel zones and non-classified applications.
You’re never locked into one source when lead times slip.
Our engineering team reviews zone classifications and compliance requirements before sourcing. You get the right fan type for each vessel space, certified to the standards your classification society requires.
One purchase order. One point of contact. No spec compromises.
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Knape Associates' extensive experience and strong manufacturer relationships make them an ideal partner for OEMs seeking fans.
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Hartzell Marine Fan Series by Vessel Zone
Hartzell’s marine duty line (Bulletin A-143) covers 14 series built to meet or exceed USCG and U.S. Maritime Administration standards. Every series ships with IEEE 45 approved motors, inorganic zinc coatings on housings, and watertight conduit boxes.
| Series | Fan Type | Size Range | Flow Range | Vessel Zone |
|---|---|---|---|---|
| 44M / 44VM | Duct Axial | 12″–60″ | 225–92,000 CFM | Engine rooms, cargo holds, below-deck supply |
| 52M | Tubeaxial, Direct Drive | 12″–24″ | 400–12,000 CFM | Medium-high pressure duct runs |
| 39M / 39VM | Adjustable Pitch Duct Fan | 16″–48″ | 2,200–59,000 CFM | Cargo holds, accommodation zones |
| 50M / 56M | Vaneaxial | 12″–79″ | 500–200,000 CFM | Machinery spaces, general ventilation |
| 65M / 65CM | Adjustable Pitch Vaneaxial | – | – | Variable-load machinery spaces |
| 03M | Backward Curved Centrifugal | – | – | Galleys, quarters, high-pressure systems |
| 38M | Direct Drive Duct Fan | – | – | General utility ventilation |
| 25M / 07M | Miniature Vaneaxial and Centrifugal | – | – | Lockers, toilets, stores |
| NST / NSV | Navy Standard Fans | 8″–44″ | 250–40,000 CFM | U.S. Navy vessel specifications |
| 18M | MarAd Vaneaxial Blower | – | – | U.S. Maritime Administration vessels |
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Fan Selection by Vessel Zone
Engine Rooms and Machinery Spaces
Engine rooms require high-volume supply air to remove heat and maintain positive pressure up to +50 Pa per ISO 8861. Duct axial and vaneaxial fans handle these zones. The Hartzell Series 44M and 44VM deliver up to 92,000 CFM in configurations that fit tight below-deck spaces. The 44VM adds a vane section for 30% more static pressure at mid-range flows using the same motor frame.
Cargo Holds
Cargo holds require 10 air changes per hour during transit and 20 during loading and unloading per SOLAS. Tubeaxial and adjustable pitch duct fans (Series 52M and 39M) serve these large-volume, lower-pressure applications. The 39M includes an ultra-quiet option that reduces sound by 5–10 dBA for installations near accommodation areas.
Hazardous Areas
Paint stores, fuel preparation rooms, battery rooms, and cargo pump rooms require ATEX-certified explosion-proof fans. Motors mount outside the exhaust duct in these zones. Air change requirements range from 20 to 30 per hour depending on space classification.
Hartzell offers non-sparking fan construction across all axial and centrifugal lines. A60 fire-rated dampers and explosion-proof heaters integrate with these fan systems in classified zones.
Accommodation Spaces and Interior Zones
Cabins, common areas, and interior zones don’t require full marine-grade corrosion resistance. We source fans from multiple manufacturer lines for these spaces, matching quiet, efficient airflow to the application at lower cost than full marine-duty construction.
Galleys and high-pressure accommodation systems still require marine-rated equipment. Hartzell Series 03M backward curved centrifugal fans serve these areas. Marine duct heaters pair with fan systems for accommodation zone temperature control.
Fan Certifications and Classification Society Approvals
| Standard | Applies To | What It Covers |
|---|---|---|
| IEEE 45 | Below-deck fan motors | Shipboard electrical equipment standards |
| USCG | Fan and motor construction | Coast Guard approval for U.S.-flagged vessels |
| ATEX / IECEx | Hazardous zone fan motors | Explosion prevention certification |
| AMCA | Fan performance ratings | Certified air and sound performance |
| ABS / DNV-GL | Equipment type approval | Classification society structural certification |
Every Hartzell marine series ships with IEEE 45 USCG-approved motors rated for 50°C ambient below-deck operation. Standard coatings include inorganic zinc on housings and epoxy polyamide amine on cast aluminum impellers. Extended electrical leads connect to watertight conduit boxes on the housing exterior.
Our engineering team reviews your zone classifications against these standards before sourcing. This catches specification errors before they become failed audits or rework during classification society review. Explosion-proof actuators and non-return dampers follow the same certification review process for vessel projects.
Why Source Marine Fans From a Multi-Line Distributor
Single-manufacturer distributors lock you into one product line. If that line has a 14-week lead time on a custom vaneaxial, your project stalls.
Knape carries Hartzell as our primary marine fan line with sourcing relationships across additional manufacturers. When one line can’t deliver, we pull from another without rewriting your spec.
Your classification society approval stays intact. Your schedule holds. We source fans, marine dampers, duct heaters, and explosion-proof actuators through one purchase order with one point of contact across the entire vessel project.
75+ years in the Gulf Coast market. Houston Ship Channel and offshore platform experience. Our engineering team reviews area classification drawings before quoting. 713-467-2777