secret/disguised vent??

anyone got any ideas? I exhaust into a crawl space. There's a hatch in the bathroom leading to the crawl space I wanna turn this hatch into a secret vent, to passively exhaust some of the crawl space, It needs to allow quite abit of airflow through it. It also needs to be disguised as something other than a vent as there's no reason for a vent to be there.

size of the hatch is 60x60cm

thanks guys

So your venting into your crawl space and want to allow crawlspace air to blow back into your bathroom?

Well I guess you'll have air freshener in your bathroom

yeah but the crawl space is used as sort of a lung room, half the air that is exhausted from the grow is dehumidified and sent back to the grow room. The other half has been going straight through the open hatch until now. I cant have an open hatch in my bathroom, it looks ridiculous and friends and family could twig on, or at least wonder why i have an open hatch in my bathroom.

All odor and humidity is taken care of before the air leaves the crawl space

If your sink is an enclosed vanity, maybe instead of the hatch, cut a hole underneath it and vent up through that instead?

nah its not but that's a cool idea, I wish I had a regular radiator cos I'd just vent behind it. Almost makes me wanna move and change My towel rail style radiator.