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Old 22-06-2010, 10:26   #1
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Engine Room Blower

Hi All,

I have 4 blowers in the engine room 2 are pushing air into the room and 2 sucking air out of the room.

Is this the correct setup?

Thanks,

Mike
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Old 22-06-2010, 11:08   #2
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If there's no other avenue for fresh air to enter, then yes. Usually the air flow is properly managed by removing at the lowest part, fresh air coming in at the highest part just in case there's volitle fumes that are heavier than air and your starter (which is mounted low) sparks it off.
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Old 22-06-2010, 11:28   #3
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Thanks,

This is a diesel engine. I think the 4 blowers are more for maintain room Temp. when motoring but might be wrong.
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Old 22-06-2010, 12:06   #4
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Assuming that the blower (Supply Air) and sucker (Exhaust) fans are roughly equivalent, and you have separate combustion-air ducting, you have a conventional balanced system.

If the fans provide combustion-air in addition to ventilation, you have a negatively pressurized system.

I prefer a slightly negative air pressure in the engine compartment (relative to the living space); which will ensure that pollutants don’t migrate from engine rm. to cabin (living space).

See Caterpillar’s excellent paper on Engine Room Ventilation:
http://www.gregorypoole.com/products...ENTILATION.pdf

See also, some earlier discussions:

Engine Ventilation: Skip it?

Bilge/Motor Room Blower Exhaust Port?

Engine ventilation
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Old 22-06-2010, 14:21   #5
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Thanks Gord, great info.
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Old 22-06-2010, 14:58   #6
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Negative pressure can be a good thing.
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