Makeup Air Units for Cruise Ships With Galley, Engine Room, and Custom Configurations
Most commercial makeup air units fail prematurely on cruise ships. Salt air eats through galvanized cabinets. Humidity kills controls. Standard powder coating won’t pass an ASTM B117 salt spray test, the 10,000-hour corrosion benchmark that marine-grade equipment must meet.
The problem isn’t finding a makeup air unit. It’s finding one that holds up in a salt-laden engine room, clears DNV or ABS inspection before the vessel leaves dry dock, and fits a machinery space below deck where every square foot is already claimed.
Knape Associates has supplied marine ventilation equipment for 75 years.
We source from manufacturers hundreds of documented cruise ship installations, galley exhaust systems with classification society approvals, and custom-configured units for hull-mounted HVAC compartments and topside equipment rooms.
Have questions? Need a MUA quote?
Galley Ventilation Systems That Meet Classification Society Standards
Cruise ship galleys run 100% exhaust. Every cubic foot of air pulled through hoods must be replaced with conditioned makeup air. SOLAS Chapter II-2 requires galley ventilation to be completely separate from other ship systems on passenger vessels carrying more than 36 passengers. If your equipment doesn’t carry DNV or ABS approvals, inspectors will flag it before the ship leaves dry dock.
Knape sources galley makeup air units with classification society approvals already in place.
That eliminates the back-and-forth that delays shipyard schedules. We also supply demand-controlled systems that adjust airflow based on actual cooking load rather than running at constant volume.
The energy difference is significant.
Demand-controlled galley ventilation can cut energy consumption by up to 40% compared to traditional constant-volume systems. Less makeup air volume means smaller duct runs, lower installed electrical load, and reduced hotel energy draw over the life of the vessel.
Corrosion Resistant Construction for Long Service Life at Sea
Standard commercial makeup air units aren’t built for salt air. Galvanized cabinets corrode. Powder coatings flake. Fasteners rust through.
The US Navy’s Pacific HVAC standards exist because this problem is well-documented. Their coastal installations require equipment that meets 10,000-hour ASTM B117 salt spray testing, E-coating with UV-resistant topcoats, and stainless steel fasteners.
Cruise ships face the same environment, often worse. The cost of getting it wrong compounds quickly. When condenser fouling reaches just 1.5mm, compressor power consumption increases by approximately 9.8%. That’s before unplanned maintenance, replacement parts, and dry dock labor rates.
Knape supplies makeup air units with configurable corrosion packages built for cruise ships and other maritime vessels. The equipment we source uses marine-grade coatings, coated or stainless coils, and corrosion-resistant fasteners.
For facilities managers replacing units that failed early or procurement teams specing equipment for a 20-year service life, the material choices matter more than the sticker price.
Custom Configurations for Tight Machinery Spaces and Shipboard Power
Off-the-shelf makeup air units rarely fit cruise ship machinery spaces. The problems stack up fast. Dimensions don’t clear hatches or corridors. Voltage and phase requirements don’t match shipboard power. Standard motor mounts fail ABS/DNV vibration criteria.
The Novenco Flying Clipper project proved this point. Lack of space forced the integration of fully tailored, compact AHUs into tight envelopes. That’s the reality of retrofit work and newbuild machinery rooms where every square foot is already claimed.
Knape sources custom-configured makeup air units built to your specs.
Options include non-standard voltages and phase configurations, variable frequency drives for shipboard power systems, modular construction sized for hatch and corridor clearances, and vibration-isolated fan and motor assemblies meeting classification society criteria.
For HVAC contractors facing an unusual marine RFQ or engineers working on a retrofit with zero room for error, the answer isn’t forcing a commercial unit into a space it wasn’t designed for.
It’s specifying equipment built for the constraints from the start.
Makeup Air Solutions for Ferries, Shipyards, and Offshore Platforms
The same equipment that handles cruise ship galleys and engine rooms works for other maritime applications.
Knape supplies makeup air units for passenger ferries and ro-ro vessels, shipyard fabrication facilities, offshore platforms and support vessels, MODUs and drillships, and oil and gas production facilities.
We’ve worked on Gulf of Mexico oil and gas projects for decades. Our team understands hull ventilation requirements, ISO 15138 standards for offshore installations, and the corrosion challenges that come with any marine environment.
If your application doesn’t fit neatly into a product catalog, that’s the kind of project we handle. Contact Knape Associates to discuss your specs.