5 Blade Nova BB Fan...
The 'howl' as you call it is standard equipment for these fans...they all do it.
Back in the day the noise was the reason a lot guys went with a flex-a-lite unit...the noise got to them.
No need to worry...if folks ask about the noise, just tell them you have a mini-blower installed and don't open the hood 
-wilma
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02 Berger 380hp #95
Lots of L78 Novas
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70 Orange Cooler
69 Camaro
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