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Wrap your ducting with Dynamat then wrap it tight with old cotton sheets and then another layer of Dynamat.

Is your basement vented? Not talking about your grow room here just the basement where the furnace and water heater lives. They use air for combustion and usually older houses leak enough to supply this but is your negative pressure grow room is leaking even slightly, over time this will pull...

I have used this technique for years it works great but has limitations. First of all I'm in Canada and all houses use 4" even for the vent to roof pipe. (newer homes, the older ones use 2") The limitation is trying to cool a room with air movement only will only work with a maximum of 2000 Ws...

You need more intake into the GR. A little negative pressure is good in your room so you don't get smells leaking out but obviously you have too much. Too much neg pressure in you room will pull in dirt, mold and other pollutants so I'm thinking you need to tone things down a bit. Why are you...