Best Grow Tent for keeping down the smell

I am looking for the best Grow Tent for 1-4 plants that will help reduce the amount of that awesome smell my plants should have when they are maturing. I have looked at the Diamond Shade, the Darkroom Street, and the Bud Box, etc., my question; which one will with the proper ventalation keep the smell to a minimum? I intend to have a fan at the bottom blowing in fresh air and a fan at the top blowing the air through a vent system up out through to the outside at the highest vent in my house which is at a level of a 4 story house. The only worry I have is when I have friends over, I dont want them smelling what I have stashed away growing. I know quite well the smell of bud and indoor growing; a buddy of mine had some plants in his closet without a grow tent and the smell was evident as soon as I knocked on his front door. Once the door was open, there was no denying what he had been up too.

Any help with the best grow tent out there would be greatly appreciated!
Thanks!

The tent doesnt really matter for smell. What you want is an inline fan connected to a carbon filter, suck air from inside the tent and exhaust outside the tent, this will cause a negative pressure inside the tent which will cause air to passively flow into your tent. The smells wont be able to escape the tent(except the exhaust) because air is flowing in. The carbon filter will get rid of the smell of the exhausted air.

Just get a good carbon filter and fan

Thanks for the reply. That makes sense...if you can picture an inline fan on the top inside of the tent with the carbon filter on the other within a 4" tubing that leads up to a vent; I should be alright I am hoping. All the air gets sucked out with the smell goes out the fan, pass the filter, and out through the tubing out the vent. The next worry is keeping the fan on 24/7 for such a long time, I'll have to invest in 2 or 3 fans (2 to be on standby in case the 1st one fails). Question: how often do you have to change out the carbon filter? For a single grow tent, having a fan run 24/7, thinking the carbon filter will have to be changed out often...once every 3 or 4 weeks?

^ good answer.

I 'm looking into going indoor and have read good things about Secret Jardin. I plant to go with the Dr240.

You'll only need to use your carbon filter during flowering, so having it removed during veg should extend the filter's life expectancy.