So you want to know about odour control in the grow room. This is just a list of the things you can use to control the odour. Ideally, use a 2-prong approach for the best results. This entails running an ozone generator and an exhaust fan with a carbon filter.
EXHAUST FAN AND CARBON FILTER:
There are several ways to run the carbon filter. First, pre-exhaust the area where you need to exhaust heat (and/or humidity) from the grow room. In this setup, the carbon filter goes into the grow room, where air is drawn first through the filter, then exhausted out of the room. The size of the filter has to be matched to the size of the fan so that the air going through the filter has enough contact time with the carbon to do the thing. If you pump the air through the filter too fast, the carbon can’t do it’s job. So, based upon the amount of heat you’re going to remove, you first determine the necessary fan size, then pick the correct filter for the fan. Don’t confuse with the order.
With the right fan/filter combo, all of the air being exhausted will be clean enough to blow directly outside (or into your house in the winter to utilize the heat and high quality oxygen rich air).
The other way to run a carbon filter is to simply connect the fan to the filter and put it into the area that you’re concerned about with no ducting. In this way, a larger fan with more air movement can be used because the air is being repeatedly drawn through the carbon filter. With this approach, the larger the filter and fan you choose the better.
Ozone use for odour control has a debate of pros and con’s, but one of the benefits is that it kills bacteria, not only in the growroom, but in the exhaust fan and carbon filter. So, if you’ve got an ozone generator treating the air in the room before it enters the carbon filter, it will kill the bacteria that can shorten the life of the carbon.
This dual approach, using ozone and carbon filter to deal with your organic fertilizer odour issues is probably the best overall approach.