Announcement

Collapse
No announcement yet.

Ventilation 101

Collapse
This is a sticky topic.
X
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    a quick question here, for a 4x4x6.6 tent, how much CFM recommended at day and at night, in a cool temps enviorment. it has an AC Infinity 6" duct fan with speed regulator. I use it at settings 2, 3 and 4. Wich are 88, 132 and 176 CFM respectively. depending on the temps. It has a Vivosun 6" filter attached to it inside the tent with negative pressure pushing clean air outside. The light is a sp250 Led wich runs cool, and had to install a secondary light, a HPS 250 for dialing temps and for better yield.

    how much CFM at day and night when temps arent an issue? 4x4x6.6 tent. thanks

    Comment


      Originally posted by Erliqin View Post
      a quick question here, for a 4x4x6.6 tent, how much CFM recommended at day and at night, in a cool temps enviorment. it has an AC Infinity 6" duct fan with speed regulator. I use it at settings 2, 3 and 4. Wich are 88, 132 and 176 CFM respectively. depending on the temps. It has a Vivosun 6" filter attached to it inside the tent with negative pressure pushing clean air outside. The light is a sp250 Led wich runs cool, and had to install a secondary light, a HPS 250 for dialing temps and for better yield.

      how much CFM at day and night when temps arent an issue? 4x4x6.6 tent. thanks
      If you pull 96 cfm thru the tent, you would replace/exchange all of the air 1 time a minute. I would say that would be the minimum I would recommend.

      Really though, since your temps are pretty low, I would just use the speed controller on the fan to dial the temps in where you want. I believe for LEDs you want 82F lights on and around 72F lights off. Since you do have a hps in there, you might be able to get away with lower temps because of the infrared coming off the hps.

      Comment


        thanks for the advice
        Last edited by Erliqin; 07-19-2020, 03:32.

        Comment


          I've a question regarding ventilation noise.I am venting a 4x4x6 Apollo tent,using a 4" Vortex.My only available vent to the outside is a from a front window facing the street.It can be heard from the front door as well as from the neighbors.I am planning on buying a muffler to reduce the noise.Is there any advantage to buying a 6" muffler?I have been told that increasing the diameter of the exhaust can also help reduce noise,but unsure if there would be any benefit to buying an oversized muffler.

          Anyone have experience with this?
          .
          .

          The longer I spend trimming,the broader my definition of "Larf" becomes.
          .
          .
          .
          .
          I Blue my mind.
          .
          .
          .

          Comment


            A larger exhaust will definitely help reduce air noise and if it is a major concern use a muffler as well.
            sigpic
            Motherless Goat Farms

            Comment


              I want something to monitor and record the CO2 in the tent, and alarm at high/low levels.

              I got 2 of these for $150 shipped: Autopilot APCEM2



              They'll at least me know trends in CO2 with activity. Readings of CO2 are within 50 of each other, at 600 PPM. Alarm is OK f you are looking right at the meter
              Last edited by flylowgethigh; 01-09-2021, 04:22.
              ______________________________ __________________________
              Dr. Tuggle's Compound Syrup of Globe Flower

              https://youtu.be/x0BinEFCp38?t=74

              https://youtu.be/NUmIO_MG5IU?t=87

              Comment


                Awful lot of reading to do. What size extraction fan would be needed for a 12 x 600w hps grow room

                Comment


                  The tent environment is quite a challenge, given the requirements for humidity and temperature. I have two possible air replacement streams in the summertime, hot humid outside air, or inside not-so humid cool air from the house. Then there is the room the tent draws air from through the vents, in which room the temp and humidity can be different from the rest of the house. An tent inlet fan can be controlled by temperature inside the tent, and it can draw from inside the cold dry house or the hot humid outside.

                  Gonna be interesting setting up and getting these tents running in a steady-state condition.

                  Of course, the first thing I will try is opening the window just enough to get the lung room air close to right with the room door closed, and the passive draw from the exhaust fan of house and outside air, so the tents are good inside. But it may need some more than that...

                  Anyways, how about an inlet air box? I have dedicated 12" on the side of my tents to an air box. The air box will have a HEPA 3M 1900 filter, be painted glossy so it is cleanable, and may house an inlet air control fan that would work with the main fan.

                  Post up pics of your filter boxes.

                  This one not only filters, but it hits the air with "plasma", and has a fan.

                  https://growershouse.com/agriair-100...e-speed-blower A little spendy IMO.



                  Here's another:

                  https://hydrobuilder.com/airbox-air-...10-intake.html

                  I think even these, duct taped into a 8" connector pipe, and sealed to a duct openong, would be better than just an open vent.

                  https://www.amazon.com/LEVOIT-Purifi...0324454&sr=8-7
                  Last edited by flylowgethigh; 01-11-2021, 01:09.
                  ______________________________ __________________________
                  Dr. Tuggle's Compound Syrup of Globe Flower

                  https://youtu.be/x0BinEFCp38?t=74

                  https://youtu.be/NUmIO_MG5IU?t=87

                  Comment


                    I have a 9x22 lean to has insulated walls and ceiling. Ceiling is seven foot. It has concrete floor. I have kept a thermometer and humidity monitor in there for a couple of weeks. It runs at 50° and 50% humidity.
                    I can build one wall with a door and it will keep the grow hidden. There are no Windows but I can cut a hole and install a window banger AC unit that I already have. It never gets extremely cold here.
                    I just ordered a six inch veeosun fan with humidity and thermal switches, I understand I can only use one or the other. I ordered another fan for six inch ducting and a charcoal inline filter.
                    I plant to paint the walls, will I also need to cover them with plastic? Would it be best to buy a tent or can I hang a walk of plastic sheeting to shut the back part/grow room from them bring part where I mix nutrients, hang plants, trim etc?
                    How much area will the six inch fans and filter take care of? I plan on using low heat LED and florescent lighting

                    Comment


                      6" fans (depending on make and model) generally move around 400 cubic feet per minute. I'm not sure if that helps, you might be metric. Carbon filters, duct length, and turns or bends in duct all effect the final amount of air removed.

                      Lots of growers just use white paint, no plastic. Then it can be repainted fresh when needed. Use a mildew resistant paint or additive for extra protection.
                      You can use plastic for a wall but it needs to be well attached to a frame so it won't suck into the grow area due to negative air pressure from fans. Needs to be light proof plastic so plants hang in dark. They make a panda plastic white on the grow side, black on the back.
                      Or you could build a wall with studs and Azek pvs panels. It's more expensive, but the pvc is mold resistant, rot resistant, and already bright White.
                      "I have only read fragments of your posts. But I have read enough to know that you can grow some mean herb."
                      --- CVH
                      _____________________________
                      "we growing.
                      till the fucking zombies show."
                      --- Useless.Gardens

                      My current thread

                      Comment


                        That 7' ceiling will limit you to a 7 'tent, which is what it is. When you lose 12" for a flat LED light and fan/filter, then need 9-18" to the tops, and need 6" for drain, and add the height of dirt in the pot, there isn't much left for the plant to grow in.

                        I bit the bullet and made the decision to vent to outside, and deal with the tent conditions during the grow cycle using the return make-up air that goes into the tent, from the inside the lung room, which is a bedroom in the house. The AC Infinity fans I have will control on temp or humidity, but not both. With no CO2 supplementation, venting the tent is the fan's #1 job, so I think I am going to get the airflow constant, and see what lights on / off do with the temp / Rh.

                        VPD chart for pot. I think tent pressure affects this too:

                        https://www.globalgarden.co/knowledg...vpd-explained/

                        Then there is leaf temp to consider:

                        https://www.blackdogled.com/lst#Results

                        Is the washer /dryer in there also? That dryer sure makes some warm moist air!
                        Last edited by flylowgethigh; 01-10-2021, 17:31.
                        ______________________________ __________________________
                        Dr. Tuggle's Compound Syrup of Globe Flower

                        https://youtu.be/x0BinEFCp38?t=74

                        https://youtu.be/NUmIO_MG5IU?t=87

                        Comment


                          If I build a wall will
                          fiberglass panels and white paint designed for wet environments work like a tent? There's no dryer or other appliances
                          It's a separate building from my home. I am in the country so the odor is not really an issue
                          I just want to control the humidity and heat. An oil filled electric heater and my windo banger should do that. I can hang a reflective curtain to bounce the light back on the plants. I can vent to the outside and use the fan to provide fresh air.

                          Comment


                            My tents are up, fans running, lights burning. I have a lot of work to do to be able to control the temp down while maintaining VPD. Those LEDs do put out heat, and one tent opening isn't enough to vent the heat from the LED down. Plus, drawing more dry air in the tent kills the humidity. For now I am using a couple wet tee shirts hanging up as moisture adders. They take the 21% ambient air to 50% @70*F

                            Edit. The height of the LED light is the key. I have small plants that don't absorb much of the energy. Lowering the lights allowed me to reduce the power and still get the umoles I wanted, while keeping the heat down. The tee shirts are working, but need to be wet down too often.
                            Last edited by flylowgethigh; 02-20-2021, 04:30.
                            ______________________________ __________________________
                            Dr. Tuggle's Compound Syrup of Globe Flower

                            https://youtu.be/x0BinEFCp38?t=74

                            https://youtu.be/NUmIO_MG5IU?t=87

                            Comment


                              what's the best way to vent an airconditioned room without losing all the cool dry air? i live in the tropics so keeping the room cool and dry is a must to stop mould. do i vent slow and steady to allow the aircon to keep up or is there another way to achieve air exchange?
                              Neem has been used extensively by humankind to treat various ailments before the availability of written records which recorded the beginning of history.

                              We are not criminals - they are the criminals for criminalising cannabis horticulture -Gypsy Nirvana

                              Comment

                              Working...
                              X