Martin J
Guru
Attached are links to interesting articles and Caterpillars recommendations on proper engine room ventalation. As I mentioned before I've done this twice, and i'd rather walk into a engine room at (110-120F) 25-30f above the outside ambient than over a 140F engine room when things go wrong on a long passage. The Caterpillar manual is very informative to siting of the fans, blowers etc.
https://mvdirona.com/2015/05/engine-room-cooling/
https://www.powerandmotoryacht.com/maintenance/how-to-properly-ventilate-your-boats-engine-room
https://www.proboat.com/2015/06/venting-the-engineroom/
https://www.passagemaker.com/technical/the-holy-place-let-it-breathe-engine-compartment-ventilation
And the last Caterpillars recommendations
http://s7d2.scene7.com/is/content/Caterpillar/CM20160713-53120-44971
https://mvdirona.com/2015/05/engine-room-cooling/
https://www.powerandmotoryacht.com/maintenance/how-to-properly-ventilate-your-boats-engine-room
https://www.proboat.com/2015/06/venting-the-engineroom/
https://www.passagemaker.com/technical/the-holy-place-let-it-breathe-engine-compartment-ventilation
And the last Caterpillars recommendations
http://s7d2.scene7.com/is/content/Caterpillar/CM20160713-53120-44971