Let me tell you this much.
I use a 250CFM fan in my 180CF room.
I use a 500CFM filter on my 250CFM fan.
I always overspec my filters compared to my fan.
The numbers for your filter should ALWAYS be higher than your fan.
If you increased the intake fan speed, this would simply push more air into your grow and would not help smell issues.
Have you tried turning off your intake fan and only running your exhaust?
This would be classed as a passive intake setup (I run my own room passive intake) by turning off the intake fan would make sure that all air is going through the exhaust filter/fan setup and then you could confirm whether your filter is effective enough by smelling the exhaust air.
J
Yes, I have. I have been funneling the air into the house, and the smell outside the house has disappeared. However, the smell in the house persists, even without an intake. I had to leave the door to the grow room open for intake, of course, otherwise there would be no intake, so again, it's not 100% correct.
But it does seem like the carbon filter isn't up to the task.. which is unfortunate. That, or the fan is too strong, as you have pointed out.. which I suppose still means that the carbon filter isn't up to the task.
So, I have decided to go out and buy a bigger carbon filter today. I looked online for Rhino and Can Lite, but they just don't seem as good to me.. they have a lower amount of carbon and a thinner layer of carbon compared to other manufacturers. Perhaps the carbon is higher quality, but I just don't trust it.. the Rhino 500M3h filter is the exact same size as my Max Filter 240M3h. I don't trust Max Filter now either so I'm going for a Dutch company.. I forget their name.
Either way, I'm going to keep the Delta fan and see what happens. Maybe I'll even get a 760M3h filter, because it's a similar price, but I'm afraid the fan won't be able to handle it.
And that's another thing.. if the fan isn't able to handle it.. is that really so bad? I mean it will still evacuate enough air out of the room, and that air will have plenty of time to travel through the carbon, right?
If the big filter won't cut it, I guess I can always use both filters instead of selling the small one, but two Delta fans at the same time is going to be suspiciously noisy..