Technical Library > A60 Marine Fire Damper with electrical actuator - IOM Instructions


1.1 The actionair Marine Fire Damper is tested and approved for fitting to class A-0 A-15 A-30 A-60 divisions (bulkheads and decks), when suitably insulated (see 15 for details). A-0 does not require any insulation to the casing.

Tests and Approvals

2.1 Fire tested to the IMO FTP code In compliance international convention for the safety of life at sea (SOLAS).

2.2 Lloyds Register of Shipping Approved. 

2.3 Marine Equipment Directive Compliant.USCG Approved.

2.4 Germanischer Lloyds Approved Det NorskeVeritas Approved.

2.5 American Bureau of Shipping Approved tomax size of 750mm x 750mm for single dampers,1580mm x 750mm for 2x1 multiple dampers.

2.6 Corrosion Tested.

2.7 Vibration Tested.

Health and Safety

3.1 Care must be taken when installing and inspecting dampers, as they are likely to close without warning due to loss of electrical power, or a temperature rise in the ductwork. This is their prime function.

Do not introduce any items, fingers or limbsbetween the blades.

3.2 Larger dampers are heavy and must be handled in accordance with current local regulations and good practice.

3.3 All wiring should be carried out in accordance withthe wiring details provided, to the IEC regulations.

General Information

4.1 The actionair Marine Fire Damper is suitable for both vertical and horizontal applications, with airflow in either direction.

4.2 The dampers which are tested to IMO fire test procedures Code, Annex 1 Pt 3, are normally open, and fail-safe to the closed position. The actionair Marine Fire Dampers are supplied with the blades in the fully interlocked closed position to avoid damage during transit and installation. It is recommended that the dampers remain closed until actual date of commissioning. All fire dampers are life safety products and should be treated with care during handling, storage and installation. 

4.3 Actionair Marine Fire Dampers are designed for applications in normal dry filtered air systems and should be subjected to a planned inspection programme.


See 15

Maintenance & Cleaning

6.1 Dampers are supplied in 2 casing and blade material options:-

430 Stainless steel blades. Galvanised Steel casing- only suitable for installation in dry filtered systems.

316 Stainless steel blades casing and drive - more suited for corrosive conditions, but even this will rapidly corrode and fail if not properly maintained, when used in air intake systems at sea. The addition of a mist eliminator is highly recommended and access must be provided for maintenance.


Two levels of testing exists.

7.1 Routine testing - Monthly, or in accordance with maintenance programme, release and reset damper (via control system or ETR test switch). Check remote indication or visual check of mechanical pointer as appropriate.

7.2 Visual check at damper - At commissioning and at least once a year, check damper operation by removing and re-applying power to actuator. (via ETR test switch).

7.3 Visually check blades for damper closed and open positions. Prove remote indication if applicable.

Routine Testing

8.1 Depending upon environmental conditions, each damper will merit its own cleaning regime. Particularly hostile areas.

8.2 ‘Frequency of maintenance’ should be determined by collecting historical data from previous visits, and for this reason, commence maintenance programmes.

8.3 Dampers in ‘Dry Filtered Air’ require very limited maintenance. When exposed to fresh air intakes and/or inclement conditions this may require monthly cleaning and lubrication maintenance to be performed


9.1 Using light lubricant, clean all exposed surfaces, using a cloth. Remove all traces of surface staining, as this will deteriorate further causing deeper material corrosion.

9.2 For 316 stainless steel blades and case, pay specific attention to the blade rivets where crevice corrosion will cause rapid failure of blades if not kept in check.

9.3 If damper is stiff to operate lubricate blade ends,open and close damper successively until the damper moves with ease. (This may necessitate removal of the actuator and operating the blades manually by the drive shaft).

9.4 Refit actuator and re-test. 

9.5 Clean off excessive lubricant.

Control Modes (3 positions)

Two sizes of Control Mode (Compact and Universal) are utilised. Correctly sized Control Modes are designed to fit only to the relevant sized damper. (See ‘Control Mode Standard Parameters’ figure) (Refer to figs 1 and 2)

10.1 Remove transit plate from damper mounting plate, and recycle.

10.2 Fit adaptor plate to Control Mode.

10.3 Position Control Mode onto mounting bracket. Secure with screw & washer provided. Tighten to 5Nm. It is important that the Control Mode is fitted with the product label denoting “fail safe close” is facing outermost; otherwise the assembly will not operate as designed.

Mechanical Operation Check

As an interim check, the damper should be manually reset and released using the manual reset key provided, (refer to Control Mode label) to ensure that correct mechanical operation is achieved. This feature may be used for system commissioning when electrical power is unavailable. Note however, the ETR is not operable without electrical power, and the damper will not close automatically should a temperature rise or fire occur.

Electrical Thermal Release (ETR) Installation

Select a suitable position for the ETR on the duct as follows:

12.1 Deck Installations - Must be anywhere below the damper.

12.2 Bulkhead installations - Ideally this should be anywhere in the top half of the duct.

12.3 Position the self-adhesive fusible link drilling template label provided in the appropriate position on the duct.

12.4 Using a 3.0mm ø bit, drill the two ETR fixing holes.

12.5 Using a 10mm ø drill, drill the central hole.

12.6 Remove sharp edges.

12.7 Push the ETR through the duct and ensure thatboth screws are used to hold it securely in position.

12.8 The ETR cable must not be shortened, and care must be taken not to damage it, as this will render the actuator inoperable. This is a built in safety feature.

Electrical Connection and Final Operational Test

The unit must be wired as described in the Application and Wiring section. When power is available, the unitmust be checked for electrical operation. Power on to motor open, power off to spring close. The unit must also be checked by moving and holding the test switch on the ETR to confirm that the damper closes. When pressureis removed from the switch the damper will re-open.This may be done after the initial installation test, to provide periodic operation of the damper to simulate actual fail-safe closure under fire conditions.

Note: Application of supply voltage will automatically override the manual locking mechanism


14.1 Fail-safe is by means of a unique and patented Electrical Thermal Release (ETR) which operates at 72°C or if power supply is interrupted. The ETR incorporates a safety feature, that ensures the fail-safe status of the damper if the ETR is not fitted on to the ductwork. 14.2 Additionally a green LED lamp is built into the ETR housing. This gives the user a simple and clear visual check that the Actuator is receiving power, the ETR is correctly fitted, and the thermal fuse is intact.

14.3 A manual test switch allows periodic operation ofthe damper for testing purposes, simulating actual failsafe release under fire conditions.

14.4 The associated electrical Control Modes areavailable in 24V, 120V or 230V versions. Also available with 95°Probe as an option. Probe section only available as a spare replacement part.

Damper Installation

15.1 All installations must be carried out in accordance with the relevant Marine/Offshore.

15.2 Authority requirements. The damper should be installed in accordance with Insulation details (as shown) that represent a typical installation.

15.3 Bolt holes are provided as standard on the damper flanges (unless otherwise stated) at 150mm maximum centres. Matching hole positions are necessary on mating coaming/duct flanges.

15.4 Apply approved fire resistant sealant/gasketto mating flanges and position damper.

15.5 Bolt A60 square/rectangular dampersusing suitable steel bolts minimum M8 diameter and minimum M6 diameter on A60 circulars.


Multiple Assemblies

Standard Application & Wiring

Control Mode 5 - 24V A.C. or D.C.24V - AC (19.2 - 28.8V) - 50/60Hz24V - DC (21.6 - 28.8V)

Control Mode 120 - 120V A.C.120V A.C. (96 - 132V) - 50/60Hz

Control Mode 6 - 230V A.C.230V A.C. (196 - 264V) - 50/60Hz

Supply On - Damper motors open.Supply Off - Damper springs closed.ETR Operates - Damper springs closed.

12W (Maximum Motoring)4W (Maximum Reset)

End Switches2 x S.P.D.T. 6(3)A, AC 250V

Mode 5 24V System


To isolate from main power supply, the system must incorporate a device, which disconnects the phase conductors, with at least 3mm contact gap.

Mode 6 230v System(Also 120V typical)

2x1 metre of halogen free, low smoke and fume electric cables are included with each control mode. The ETR is also pre-wired with 0.5 metre halogen free low smoke and fume cable.

Faults and Problems