Watertight louvre opening for Emergency Generator

[aungkyawtun]

Dear Gents,
IS there any standard for the sizing the exhaust louvre for the emergency generator's radiator.Now the caterpillar generator personel asking for the 150% of the radiator cross sectional area.

 

[cvg]

if you want Cat to stand behind their warranty on the generator, give them 150% or more. Or better yet, provide an exhaust fan which will provide posative ventilation.