Intergarted recirculating cooker hood

[tae]

Hello?
I installed an intergrated recirculating hood while repairing the kitchen this time, and I have a question.
I installed a hood in the cabinet, should I make a hole through which air flows out of the cabinet? Some people say they don't need it, and others say they need it.

 

[JohnD]

A recirculating hood is pretty useless, it is just an ornament.

 

[jj4091]

Ditto