All the filtering in the world doesn't help when the grow op keeps popping the fuse of a local distrribution transformer.
If you're dragging that much juice out of the grid, you're either doing it on an industrial scale, or doing it wrong.
There's people out there running grow tents for their own personal, on less than 150 watts. Why have a 400w or 1000w High Pressure Sodium bulb + ballast combo (and associated heat) when a 100w or 200w cluster of CFL grow-lamps does the job? You can even switch between high-K veg lamps and low-K bud lamps, if you're not just using feminized autos. Even the ventilation fan you'll typically run through an £80-£90 variac at 80-100 volts or so (assuming a 230v supply) to keep the noise level down. All it needs to do is slowly cycle the air out of your tent and through the filter, and you use negative pressure to keep the stink where it belongs.
Google "autoflowering" versus "photoperiod" if you're wondering what I mean by "feminized autos". If you're on this site and don't know what a variac is... oh just google it. Also known as a variable transformer. Think Steampunk Dimmer Switch, only minus the awful hum that dimmers induce in a circuit.
Me? Well, I'm quite legally clean, otherwise I wouldn't dare make comments like these on a web site. I just happen to know a thing or two.