Marine Air Flow International

Engine Room Air Dampers

Marine Engine Room Air Dampers (Fire Flaps)

Air Dampers can now be purchased directly in our new Marine and Industrial Fans Online Store

Air Dampers are a necessary requirement for the engine room of any commercial in-survey vessel, and are also a good idea on non survey craft.

Typically Air Dampers are either triggered automatically or manually, and effectively close the air supply to the engine room to allow fire suppression equipment to work. We can manufacture and supply Air Dampers (Fire Flaps) either in conjunction with our Air Intake Grilles, our Fans or supplied on their own.

They can be mounted immediately rear of the grilles, within the duct work itself, on the bulkhead or deck head penetration, or any penetration that serves air into or out of the engine room.

Our Air Dampers come with a control cable that runs from the damper to an external location outside of the engine room space. This manual control is easily operated by disengaging the pull ring from the keeper bracket. This action trips the spring loaded damper louvre which closes off the air supply to your engine room. This is also a semi auto control. If there is fire or intense heat in the vicinity of the control cable (which is a synthetic material), the cable will melt and trigger the flap automatically.

For a fully automatic system, we can supply the dampers with a 24V DC actuator. This actuator works via a temperature probe mounted in the air out stream , and once the probe reaches 72°C it will shut the damper automatically. The actuator will also trip if the power supply to the system is turned off. These automatic controllers are a great option for a set and forget situation ensuring full piece of mind.

If you use an Air Damper system, you will need to test and prove the system annually for a surveyor. To reset after this test simply re-pull the cable and re-engage the ring into the keeper bracket. It's very easy. 

If your vessel is in survey and you need to meet a certification level, we can also supply A-60 class certified air dampers

Marine Air Flow Stainless Steel Air Damper

About Our Air Dampers (Fire Flaps)

  • 11 Stock sizes ready to be picked off the shelf
  • Manufactured to size and shape.
  • Could be easily installed by an owner operator.
  • Manual or Automatic release.
  • Easy to reset after testing.
  • Can be supplied singly or in conjunction with air intake grilles or our AC or DC Fans.
  • Meets NSCV & USL code.
Buy Online!

Our Stainless steel air dampers can now be purchased online in our new Marine and Industrial Fans online store. Use the button above.

Air Damper Details:

Finished Product Details

Footprint:Matches High Vol Ac/Dc Fan housing footprint
Materials:Stainless Steel 316 marine grade, fully welded.
Supplied Finish:Stainless steel is electropolished to better increase its protection from corrosion.
Action:Spring loaded louvre / Automatic 24v DC Actuator
Cable:Synthetic stretch proof high tensile. Melting point of 120 degrees celcius.
Sizes:We have the following stock sizes. (length x width x depth)
200|200|100    200|730|100    200|970|100
280|280|100    280|590|100   
390|390|100    390|730|100    390|1070|100
Accessories Available:
24V Damper actuator / Finger guards
Stainless Steel Air Dampers - Spec Data Sheet

Click on the link below to download our SS Air Dampers Specifications  Sheet (Spec Data Sheet).

SS Air Dampers

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Damper Activation Installations Instructions

Damper Activation installation directions.

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Air Damper Pricing (Stainless Steel Dampers)
Size: (height | width | depth)Cost:
200|730|100    &   390|390|100$1280.00
200|970|100    &   280|590|100$1380.00

NB: These prices are list prices. If you are a boat builder or interested in bulk quantities, please contact us for trade discounts.

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