I always keep a minimum of 2 12" fans in my 4x4 tents one wall mounted blowing over tops and a cheap 12" desk fan on the floor angled upward a bit I am thinking of adding a third but I'm scarred from a pwm outbreak awhile back
I am able to have some good air flow from a vent hole i cut in a closet door at the bottom, this creates a wind effect from the negative pressure created by the exhaust fan, I also have a small fan directed midway up the plants and then another fan directed at the lights to diffuse the heat.
Yeh I used to have a 10" in the centre blowing at the vertical bare bulb and under the canopy but also did a trim of the underskirt so to speak
I had a small fan in the flower tent..
I do appreciate the posts although it's not quite on the same track. The space isn't a tent and to cut a long story short it has a volt stepped intake/outake system, negative pressure in a meaningful amount isn't there (again saving you details).
I'm wondering if a tower fan at the middle of the space (3x10) and two floor fans, one on each end of the space would cover me for canopy airflow. I realise this would take a certain amount of loli pop to work, in order for the fans to be able to blow the moisture up and out of the canopy.
Alternatively I had another idea. I already use some under canopy ducting with ''intake'' center canopy to circulate pot height humidity into the de-heuy/airflow. What I was thinking of doing was blocking off the end hole of the ducting and then cutting some 1 inch circular holes into the ducting down the length of it. Those holes would be covered with some cheese screen. Then I will use a mid height scrog net to rest the ducting on, it will sit on level with the canopy at first flip. During stretch another net will be used about 8 inches above the first, tops will fill and be woven into the top net. The idea would be, the ducting is resting on the bottom net, running down the center length of the canopy with holes in it that can suck excess moisture directly out of the mid canopy. The out-take from that again will be pushed toward the de-heuy/tower fan where it is mixed and circulated.
Any further thoughts or ideas welcome. Logistically, the roof shape and optimal light layout does not leave much flexibility for traditional air circulation methods.
The key factor for me is any fans have to be metal. I have 0 faith in plastic circulation fans.