Hi DaDuck,

I'm not sure if this will help but let me walk you through my situation and how I am going to tackle it. Odor is of particular concern to me. Note that in my situation it is going to be quite difficult for me to vent externally. In this regards I believe our situations are similar. I'm willing to spend a little money on this if needed. However, my grow room will be enclosed such that I will be able to vent and scrub which is different than your situation.

My solution involves redundancy and dual technologies - I will cap the 6" intake duct with a carbon scrubber and I will deploy an ozonator in the vent room to deal with anything that gets past the carbon filter. I'm going to start with the carbon scrubber. If it is not able to keep pace with the odor then I'll deploy the ozonator. Thoughts appreciated. Will the carbon scrubber alone do the job? Are there better options?

I've looked at the odor boxes (ONA and that stuff) but seems to me that that is just a mask and nor really applicable to my situation except as perhaps triple redundancy. I want the odor killed. DaDuck, you many want to also look at an odor mask like the ONA stuff. You could situate it close to the front of the house thereby providing a first line of defense. There are a bunch of DIY kits you can pull together yourself.