co2 dispersement?

Whats the best way to disperse the co2 in a sealed environment with a controller? Ive had mine hooked to an oscilating fan at just under lamp level set to 1500ppm. It seemed to work fine but i moved the sensor up to the top of the garden near the colas and the controller read 690 for a whole day session.

any ideas...maybe a couple small tilt fans below the canopy pointing upwards?

Yup. Co2 is heavier than air, so it naturally goes to the floor.

I point the fan towards the ground a little and I get a pretty constant number.

I was going to say thats the best way, or do the opposite and suck it off the floor and push it up, but a cheaper fan will probably do as good a job as any pushing towards the floor..