Ya, sorry that I forgot to keep it tent-specific. The simplest version of a positive pressure system in a tent would be intake fan-->lights-->open air inside tent. Additionally, but separately, filter-->outside of tent. (Another option would be to, instead, bypass the lights and intake directly into the open air inside the tent) A majority of the air will still flow through the filter in this setup, but it will almost certainly leak air out of what I assume are a good number of small gaps in even a nice tent's construction. Some variation of this may work in a tent, but it's possible you'll run into heat issues as it's an intentionally inefficient circulation of the air. I've only run environments like this in garage-sized rooms. It might not work for you, but I think it's an important concept to understand for environmental control generally.
Alternately, you could pressurize the room that your tent resides within, but you would obviously need two fans minimum. One to move air through the tent and the other to pressurize the room. This just gave me a thought too; maybe it would be possible to pressurize a tent within a room of negative pressure. This could allow you to fully filter your exhaust but also may lead to condensation in the outer room. Sorry if I'm gettin off track, hope some of this is applicable.