Marine Air Flow International
+61 428 301 700

Engine Room Air Intake Grilles

Salt spray and mist in your engine room has traditionally been one of the most difficult issues to control. Now with Marine Air Flow moisture reducing air intake grilles, you can remove the problem altogether.  Damage such as blown turbo's, blocked air filters, wide spread corrosion and degradation of your valuable engine room equipment can now be avoided. 

Features include, reduced damage to valuable plant and engine room components, custom made to suit your unique vessel requirements, no moving parts for affordable maintenance and they are supplied with a full installation kit and instructions.

Using engine induction or engine room fans, the moisture laden external air supply is drawn through our grille, passing through a complex system of vanes in the process. This action removes the moisture laden molecules from the air, leaving behind a considerably fresher air supply inducted into your engine room. 

How Mist Eliminator Grilles Work:

  • Air is drawn into the face of the grille. 
  • The moisture laden air then passes through a system of vanes which trap the moisture in the air and cause it to run vertically down the face of the vanes and then be expelled via the external drain. 
  • The moisture reduced air is then fed into your engine room for use by your engine and other components. 
  • The vanes are sufficiently complicated to trap the moisture, but not so complicated that they significantly slow the air flow.

Flange Info:

We have three flange options the details of which are below.  All these options have a fixing flange of 40mm & a face flange of 25mm. 

Flush Flange

 With this option the fixing flange is flush to the outside face of the grille. Once installed only the 3mm thickness of the flange protrudes outside of the vessel. 100mm of the grille thickness extends into the air ducting, reducing the airway by 100mm. The drain slots on this assembly are totally visible to the exterior face. 

Limited Flange

With this option the grille extends 70mm to the exterior of the vessel and only 30mm protrudes into the air ducting. This achieves the least restrictive passage within the air ducting. It is recommended that this arrangement is utilised in any restricted airway so as to maximise air flow.  

Stepped Flange

With this option the grilles extend 30mm to the exterior of the vessel and 70mm protrudes into the air ducting. On this assembly the drain slots maybe mounted on the underside edge and thereby are not easily visible. This achieves a more aesthetic external appearance. 

Fixing Flange

The fixing flange is 40mm.

Performance Data

Performance - Single Stage Grille

Water handling 250 litres /min over 1m 2 area
Max face velocity 5.9 metres / sec
Efficiency 100% visible 

Download the Spec Data Sheet for our Air Intake Grilles

Performance - Two Stage Grille

Water handling 250 litres /min over 1m 2 area
Max face velocity 9 metres / sec
Efficiency 100% visible 

Finished Product Details

Fins / Vanes Extruded aluminium vane section welded into position.
Surround Aluminium to 6106T6 grade. Fully Welded.
Supplied finish Acid stripped and dipped. Fully immersed chromated & powder coated to chosen colour.
Painting Can be painted to suit, however we don't supply the grilles painted.

What Info Do I Need For A Quote?

  •  The number of main engines in your vessel. 
  • The make and preferably model of your engines.
  • The shape of your grille penetration
  • The area of your grille penetration - or - the height & length measurements of the penetration
  •  The total horsepower of these main engines
  • The horsepower of generators in your engine room
  • The volume of your engine room -   or   - the height, width & length measurements so our web site can calculate this area. 

Once your grilles are installed in your vessel they require very little maintenance. Our Grille Maintenance page will show you the steps to maintaining your grille in the best possible condition. 

One of the common challenges with inferior Intake Separator Grilles is salt mist bypass causing challenges further down the line resulting in out of warranty equipment failures. IE: salt mist damaging fans, dampers, engines, generators, insulation, corrosion and electronics.


Often to meet the engine manufactures needs you will require large volumes of air to ensure the operating temperatures are below the manufacturer's requirements. This can mean higher intake velocity resulting in the need of quality Intake Separator Grilles to ensure the best possible outcome with regard to eliminating salt mist and spray in you engine room.


Don't be the only boat heading out to sea without the protection of Marine Air Flow air intake grilles.

Air intake grilles are available starting from $1200 + gst, however the average price of a grille is between $2200~$3000 + gst. The price of the grilles is dependent upon varying factors, and of course the size required to ensure accurate operating air supply is the governing factor in our pricing structure. 

We can also manufacture the grilles in almost any shape and offer complete engine room ventilation systems. Before getting in touch, it would be great if you had the following info on hand. 

Contact Us

Get in touch via phone, email or through our contact form and we will be pleased to assist with all your engine room ventilation needs. 


33-37 Paradise Avenue

Miami QLD 4220

6am to 4:30pm. Mon ~ Thurs


Mark:  office[at]

Brad:   info[at]


Mark:  +61 428 301 700

(Chief Estimator)

Brad:      +61 400 714 803