I will give a dissonant voice on it i guess.
The air flow in the space where the plants are living is more important than we usually think. By default, you must be able to chill one hour in the zone without any discomfort. Under the lights. Simple tricks, no complex science involved. Without any pity with environmental errors, but universal (even for fem factories) in the great results you can get.
We're all used to read than a negative pressure is a security question, but in fact this is the absence of positive pressure that must be aimed. Not the same thing.
The enemy with negative pressure is the aerodynamics rules involved. With a high pressure, it virtually draw a direct line from the intake to the extra for the airflow, and everything outside this thin line is turbulence. Like the old plane wings, it's a bunch of "micro-tornado" of old and saturated air that turn on themselves. No need to say than in this conditions, ventilators only create more turbulences and don't help much for the air exchange around the plants.
In the case than you absolutely want this negative pressure (because short to set an active intake or limited on the optimization for a bunch of reasons), the miracle product is this one :
The yellow tubes are called airsocks, it's just a textile tube but builded for an optimal distribution of the intake. It's used for active intake, but with a crazy negative pressure (like walls of the tents "bended") it work with passive intake.
You place it on the ground (instead on the roof like the photo) on a "circuit" that cover all the perimeter of the space. it will slow down a lot the air exchange (your plants will thank you both in yield, time and disease/pest costs for that) and it will broke enough the thermodynamics effects created by the negative pressure/lights heat. In bonus : it filter your fresh air, it's cheap, easy to set, "machine-washable" and most of the time (EU) growshops have versions for us.
Optimally and with the "airsock perimeter", you will cut a (mostly) centered holes for the outake/carbon filter in the roof of the tent (pain in the ass to do on some tents).
But i repeat, if you're feeling in your crop like on holiday in a Caribbean island in winter with a nice breeze on the whole body : you win the battle. Specially if you're close to ear the ocean with your imagination and a fat blunt lmao.
best vibes for your plants