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inside radius x inside radius x 3.1415
I think where I messed it up is that it's supposed to be radius and not diameter. Always confuse the two. Macro caught that one.
"A radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length."
Since radius is a line from the center of the circle to the perimeter or edge that would mean the radius of an 8" port would be 4". Using the formula it should be 4" x 4" x 3.1415 = 50.264 sq/in. For a 6" port it would be 3" x 3" x 3.1415 = 28.2735
Each port vent is 72 sq/in. Now that I have the correct numbers that would mean each 8" port is a little less than 2/3 the sq/in of the vent flaps. All 3 vent flaps open would provide 113.094 sq/in of vent capacity. My tent has two 8" and two 6" round ports I can use for input air. Opening them all would give me 157.075 sq/in of vent capacity.
To approximate the same sq/in vent capacity of the tent vents I would have to keep both 6" ports and an 8" port open. This would be for a passive intake system.
I'm trying not to use a booster fan for the inlet but it looks like I may need to to get enough air in the tent.
I have a 6" pole mounted fan and an 8" Honeywell turbo force fan I hung off the roof inside the tent for air circulation. The 6" works fine as an air circulator but I think the 8" would work better as a booster. I'm going to have to rig up something to get the duct to fit around the back of the 8" fan. I guess I can set it on the floor with the duct attached to the rear of the fan and use it as the under canopy fan so that fresh air comes in from the bottom and pulls through the tent up to the fan mounted on the ceiling. Problem is there isn't much room on the floor as I plan on running six 7 gal cloth pots under a screen so there won't be much floor space to set things down on. Honeywell site says the fan can do 185 cfm at high setting so the fan should be more than sufficient at getting air in the tent. I'll need to tweek the speed of the fan to get the slight negative pressure I'm trying to achieve in the tent.
You also will need to close those flaps (or duct them to block light), when flowering, or the light will ruin your grow...
inside radius x inside radius x 3.1415
I think where I messed it up is that it's supposed to be radius and not diameter. Always confuse the two. Macro caught that one.
"A radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length."
Since radius is a line from the center of the circle to the perimeter or edge that would mean the radius of an 8" port would be 4". Using the formula it should be 4" x 4" x 3.1415 = 50.264 sq/in. For a 6" port it would be 3" x 3" x 3.1415 = 28.2735
Each port vent is 72 sq/in. Now that I have the correct numbers that would mean each 8" port is a little less than 2/3 the sq/in of the vent flaps. All 3 vent flaps open would provide 113.094 sq/in of vent capacity. My tent has two 8" and two 6" round ports I can use for input air. Opening them all would give me 157.075 sq/in of vent capacity.
To approximate the same sq/in vent capacity of the tent vents I would have to keep both 6" ports and an 8" port open. This would be for a passive intake system.
I'm trying not to use a booster fan for the inlet but it looks like I may need to to get enough air in the tent.
I have a 6" pole mounted fan and an 8" Honeywell turbo force fan I hung off the roof inside the tent for air circulation. The 6" works fine as an air circulator but I think the 8" would work better as a booster. I'm going to have to rig up something to get the duct to fit around the back of the 8" fan. I guess I can set it on the floor with the duct attached to the rear of the fan and use it as the under canopy fan so that fresh air comes in from the bottom and pulls through the tent up to the fan mounted on the ceiling. Problem is there isn't much room on the floor as I plan on running six 7 gal cloth pots under a screen so there won't be much floor space to set things down on. Honeywell site says the fan can do 185 cfm at high setting so the fan should be more than sufficient at getting air in the tent. I'll need to tweek the speed of the fan to get the slight negative pressure I'm trying to achieve in the tent.
We run 2x 6" AC on a 4x4x7 tent (intake & vent).. @ 20% power, they move plenty of air to meet circulation needs, but we run them at higher speeds for heat/humidity control.
On the tent intake fan, I am running an evaporative cooler I engineered out of a carbon filter (and it must be run on the intakes port of the fan, unfortunately). That said, the coolpad has a much better air flow than carbon, so I don't take as big a cfm hit... and I am willing to make this Faustian bargain to get some "ice" from "fire" (I've gotten 37° temp drops from ambient with it this summer, 3° short of the 40° threshold -- my pump/drip system needs fine tuning).
On the tent vent port, we just duct the exhaust into a 2x4x7 sprouting/veg tent... which also has an additional 6" hooked to a second evaporative cooler I designed.