Rank: Forum user 
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Does anyone have any knowledge on dilution fans? This application is for a Fire Sprinkler pump room and will have the extraction system supplemented by a dilution fan. My question surrounds whether the dilution fan has to be linked to the sprinkler pumps (diesel) so that pumps will not run if the dilution fan does not work, in a similar manner to a gas boiler. But the problem is that this is life safety system, so can it be interrupted by such a measure?
Any comments or help would be most welcome.
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Rank: Super forum user 
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I'm guessing that the dilution fan is to supply air to the pump room to balance the extract fan.
It does not seem to me to be correct to have a fire pump fail to operate in the event of a simple electrical fault to a fan, particularly in a life safety setup. In any event if the oxygen level in the pump room falls below that required to support diesel combustion the pump will fail.
This seems to be an unusual arrangement as most pump rooms are sited on the perimeter of sites or structures so have ready availability of intake air.
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Rank: Super forum user
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I agree with david - dilution fans would normally be "diluting" the contaminant but in this instance it appears to be supplementing the extract system - which seems to suggest the current system is not balanced. To be able to effectively extract there must be an equal volume of incoming (clean) air. And you are right too - it does seem odd to link it to the pumps. Is this linked to the recent reclassification of diesel as a carcinogen?
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