Hey all. I don’t see this done often on people’s grow videos. Not trying to reinvent the wheel here but here’s a little hack I do. Really you only need the carbon canister later in the grow. But you still want air flow thru the room. I use the carbon pre-filter pads and just hose clamp them on. Keeps the fans clean and you still get good air circulation. When the time comes when the things start to smell slap the canister filter back on. Why burn up those canister filters when you don’t need to??