Scrubber or exhaust? using C02 with a/c

Hello everyone I have my room pretty close to finished. My lights are on air cooled hoods and I'm using a/c and co2 with perfect temps. I know odor is going to be a problem soon so I was looking for some opinions.

1. Should I just use a scrubber in the room?

2. I don't think I should vent all my precious c02 out of the room as soon as its pumped in. I only have the cash for a fan/filter, a automated greenhouse controller is too expensive right now.I also have a small squirrel cage blowing in fresh air.

any opinions or experience?

thanks