advice needed on odour for 2 plant grow newbie

hi people well basically im going to be starting my 1st ever grow soon with autos to start of. il only be growing 2 at a time as space is limited and i have to be a ninja about it as others in the house must not find out! im just going to use a 40x40x80 chest of draws which im just about done converting and a 300w duel spectrum cfl for light. il also be installing 2 4" pc fans for air flow.

now all i need to figure out is will i get away with using ona block dispenser on a 15min spray cycle or will i need to buy a 4" extractor and filter??

what do yas think? id love to know now rather then panic trying to sort it out later on.

thinking of starting out with Buddha Seed Bank White Dwarf

any tips or pointer to help me out?

thanks guys

4" is loud as hell and not stealthy in any way. Even with the variable control it's still makes some serious noise. If you want stealthy think more micro less cab.