Are my passive intakes enough?

Hi I have an RKW 150 460m3 for extraction and then for intake I have a vents TT 4inch 187m3/h blowing at my 600w hps and then in the door I have 2 of those black 90degree pipes that are 3 1/2inch each. When light is on my extraction switches between full speed and second speed most of the time and the neg pressure is quiet strong but not too strong and when lights are off I turn the vents TT off and the extraction sits on the lowest speed the whole time. My question is if my passive intakes Are enough? of do I need more. The pressure is enough to pull the door shut when its an inch or 2 open and fans on full speed I'm growing in a cupboard 8x4x3 foot
Thanks for any help

as long as its negatve it wont matter there wont be any smell outside the room

but the fans are fighting hard to retrieve more air so premature failure will be inevitable you can always tell by the sound from them when they are high negative.
i always like to have a little pull on the door that way you know its negative but you can fine tune them by using a gas lighter flame near a small hole or crack on the outside and you will see the flame being sucked in when it is negative.

you can put a disc over your passive hole that is slightly larger, with a screw that holds it quite tight so you can turn it to open and close the passive opening a bit like the little flap you get on the spyhole on the inside of a front door.