Too much neg pressure?

Just got my 30x20x63 milliard tent that will be going into a closet and venting into an attic via a 440 cfm ventech fan. I have a variable speed controller on the fan and even at half speed the negative pressure is pretty intense. I'm going to be battling temps so wanted to go big on the fan just to remove as much heat as possible. I have the 4 inch hole open for intake and tent looks like it's being sucked into a black hole.

Any concerns with this amount of neg pressure besides it just stressing the tent and the seems? I know the pressure is good for air replacement just curious what you guys think. Also does your fans hooked up to controllers make a buzzing sound when not run at full/normal speed?

Why don't you switch it around; some positive pressure has been studied causing faster plant growth.

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Make your exhaust side tubing or duct larger. This will slow velocity and decrease the negative pressure. If it is 6" going in then increase to 8" on the exhaust.

440 cfm is for like a 5x5x7, so yes dial it down certain fans buzz when dialed down some don't really.. When venting to an attic you defiantly gotta be careful with negative air pressure I live in a condo and have vented into a big ass chimney shared by 3 other condos, but you gotta open a window otherwise I would start sucken the neighbors cigarette smoke through my outlet plugs and worse of all I would have to open the window enough to wear when I put a cigarette lighter to the gas hot water tank exhaust it would still go uP, and not blow the flame down = carbon monoxide poisoning gotta be careful with that negative pressure from the furnace exhaust too, I've never vented into an attic but I'd watch for mold up there.

Thx for the response guys. Good ideas I'll look into. Just dialing it in for when summer goes back to hell where it came from.