How to get rid of smell?

get a carbon filter, I believe your tent is a 2foot x 2foot so you wont need a very big fan or carbon filter. Make sure the tent has negative pressure once you have your unit installed. Otherwise smell can leak, you want all the air going out of your tent through the carbon filter :) Also the Xiaomi air purifier would probably cost more then just getting a carbon filter 💪

Just my sure you get the exhaust fan as well. And seal up the box as best you can.