Answers in red below
What type of lighting are you running? 400 watt Metal Halide non air cooled open reflector I ask because how much heat we have to deal with is key. Also how long are your duct runs?
Exhaust: 7 ft 6 in duct to outside, 4 bends
Intake 1 : 5 ft 5in duct to outside, 3 bends
(maybe, but most probably not) intake 2: 13 ft or 157 in duct outside, 5 bends
Air cooled reflector? No
Carbon filter? Yes
Will you be using flex duct or the snap seam galvanized for long runs? Flex ducting, as the runs are small and i want the flexibility.
Do you care about noise? Yes, but I am okay with keeping the fan in the tent in the garage. I'd cap the noise at 40 DB. I don't think I will ever run the fan on max though.
What temperature is the air that will be cooling the tent? it will start getting cold now. I am in Vancouver, BC. Day time temps in the tent currently range from 22 C/72 F to 28 C/82.4 on the plant canopy are already. It is starting to get colder now. I am guessing I will probably need a heater in the winter.
I love the Vortex brand. If noise is an issue, you can oversize the blower and run it on a variac to slow it down so it moves the right amount of air without any noise. Their VTX series is what you want. Their 6 incher is 497 CFM. cool, i looked into it, but these are expensive on amazon canada. How do you feel about the Tjernlund M-6 Inline Duct Booster Fan? Would it satisfy my needs? It is selling for 128 CAD without the variable speed controller. What controller would you recommend to go with this fan?
If you are venting for heat from a HID light the general rule is tent volume in cubic feet times 2 or 2.5 to get the CFM required. Thats a really general rule. If the air you are using to cool is cold you won't need as much. If you have a lot of ducting and bends and other restrictions like a carbon filter and such then you need to add some CFM to account for the static pressure loss. Understood, I don't know how my current duct configuration compares but please take a look above and let me know for the Tjernlund M-6 fan.
If you are running a LED light that doesn't put out much heat then you only need to vent for humidity and CO2, in that case a smaller blower would suffice. Not running an LED but I will most probably upgrade to an LED to maximize a 4x4x7 tent
A speed control is handy, some cheap ones make the motor groan because it chops up the wave form and it's no longer a sine wave. I am running a 10 inch vortex on a 2x4 tent with a variac set to 35 volts, trys to suck the tent inside out so I put two high cfm kits on the tent. You can't hear the blower though lol. High CFM kits, those are handy. When you say HIGH CFM kit, do you just mean a high CFM fan?
I hope all that info helps in your decision making.
at the end of the day, I can add another 190 CFM 4 in inline mixed axial fan for intake 1 in case my plan to use 1 460 CFM fan doesn't work, but if ot works, than I can just use that money towards something else
Thank you for your responses. Centrifugal blowers were not on my radar. A lot of youtube videos and posts on the microgrowery reddit do not emphasize blower fans. They highly tout the mixed axial fans like the AC infinity cloudline T6.
