Any way to vent without drilling holes?

Hiya there

Long time lurker and grower, first time poster.

Ok so heres the deal. Just moved into a lovely new house and found the previous owner had done up the loft with floor panels and had a loft hatch hidden in the walk-in wardrobe etc making for a great and discreet grow room. The room has power and lighting and I have roughly 400sq feet to work with.

Problem is the loft is completely sealed with several layers of wood panels and even if I wanted to drill through them all I'm actually next door to a school. Getting fresh air into the loft is a major problem and it's come across rather stale every time I go in. Circulating the air back into the house wouldn't be too much of an issue but I'm concerned about the smell (and ballache) and whether or not recirculated air would be good for the plants.

Should I bite the bullet and start drilling holes in my nice new loft or do you think an ozone generator and venting their air back into the house is a reasonable option?

Thanks for your time.

wouldnt recirculating the air be defeating the purpose? you would be recurculating oxygen and they need co2 right. dont you have an attic that you could vent into? what about removing one of the wood panels.

personally i would just get a carbon filter and recirculate into your loft some pics would be good of your grow space but i would have a fan pulling air in and one going out through your carbon filter of course to mask the smell of the exhaust going out plants breath CO2 and out oxygen so they need what we breath out so a in vent i think is necessary but if you want the CO2 go out and grab a CO2 sys lol sure you wont be disappointed.