I used to grow in a solid room and I used a 6-in exhaust at first. I ended up doing what you're talking about and switching to a 10-in exhaust and put the 6-in on the intake. I would only run my 6-in fan during the summer.
The best thing I ever did was upgrade my filter to one that had massive area of charcoal exposed to the air. It was also a very easy setup to replace the filter.
The filters are individual flat panels that pull out through the side, I can't be arsed with trying to hang a massive filter every year.
J
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