Carbon Filter Placement - Question - stealth box inside a cupboard.

in a nutshell ive built this box inside my cupboard so its self contained box within my cupboard.

ive ordered a 4" fan/carbon filter/ducting etc...

my plan is have two grills on either side of the box near the bottom, with pc fans acting as intake while the carbon filter/fan kit sucks it all out the top.

my question is as the fan sucks all the air out the top and into the cupboard would the odour still be around? ive researched and planned and thought about it but several sources say it needs to be vented outside, now this may be me misunderstanding since they did use HPS/MH and this may be a way to extract the warm air...but im in a relatively clod climate so cooling down isnt that much of an issue.

ill have a few ona blocks or maybe the gel sitting by the duct at the top of the box

anyone know what i should i do?

Thanks

anyone?

bump

You would have to provide a schematic drawing or blue prints to say.

i dont think i would, i am asking if i vent a carbon filter into a room rather than out of a window would the odour still be present?