Silent dr90 1st time

Hey peeps i need my setup as silent as possable and am not using air cooled lighting. I have sj dr90 with 400 w duel spec hps,400 watt digital hacienda ballast, euro reflector and a plug n grow timer (i have been told its fine to use on 1 400 watt bulb). As for venting????? I was thinking 5" rvk A1 with matching rhino filter. Would i be best off with the 5" rvk L1 an use a 0.75a variable transformer, or 6" like i say hav'nt bought venting part yet so any help would be great. So in short dr90 400 hps euro reflector best an most silent fan to get with. uk climate. On the note of intake fan if my room is well vented any need for a intake fan, If so i know to buy the 1 smaller than main thanks guys an girls

get a 4" 150 cfm fan minimum...... and you dont need a intake fan just use passive intake.......also you must exhaust your air OUTSIDE the room the dr90 is in......... so you cant just let your fan exhaust back into the room your tent is in it must be exhausted ether ouside or in attic .......

Soler&Palau make a silent line now. I think a silent td-150 would do you well.

And yes as footclan says exhaust outside, bring it fresh co2 for your plants to eat up. Plus good ventilation is key for healthy, disease-free plants. Get a fan in the room to blow air around in the room.

Theres also a thread in the sound area that shows you how to make a box that goes over the fan, for extra noise dampening.

Yea am gonna cut hole directly above tent into loft just put a thread of what i mean. So you think 5" rvk A1 will be gd with filter an no passive thanks

i rap blankets or foam padding around my fan.... it wont over heat it cools from the inside out.....