One specifically for marine use is blue sea s atd automatic timer disconnect.
Boat engine room vents.
Forced ventilation should include both inlet supply and exhaust air.
Ensuring your engine room equipment is free from salt mist and spray is just the starting point of a better engine room ventilation solution for your boat.
Boat engine blowers are a great place to start since they are made to push a huge amount of air out of the engine room but it can also help to position boat engine vents in strategic locations to help cool the engine room off after the boat has arrived at its destination.
A time delay relay will do this automatically.
It is important that these systems are designed and installed to minimize the possibility of water intrusion.
Engine air intake vents.
Marine air flow is an australian company that specialises in engine room ventilation equipment for vessels of all sizes and operating conditions.
Many power boats feature a ducted system to moves fresh air from outside the hull through louvered grills dorade boxes air duct hoses and then directly to engine air intakes.
In the ideal installation inlet air will be ducted into the engineroom low near the sole and away from heat sources while exhaust air will be drawn from the top of the space directly over heat producers such as engines.
When a boat is under power the engine can create an amazing amount of heat so it s important to ensure the marine engine room ventilation system is doing its job.
The blowers should be wired to start when the engines do and stay on for 15 minutes or so after shut down that will cool the engine room much faster than by passive ventilation.
Having the correct ventilation setup will ensure better operating costs conditions and an extended lifespan of your equipment.