Results 1 to 10 of 10

Thread: Too small autos, probably not enough airflow?

  1. #1

    Join Date
    Jan 2018
    Location
    Europe
    Posts
    114
    Thanks
    232
    Been Thanked: 234 Times

    Default Too small autos, probably not enough airflow?

    I am growing Cheese XXL and Moby Dick XXL autos and its 2 months and the plants look pretty short and small ... just 60cm. Probably because I don't have enough airflow? I have a small intake fan and outtake is just a hole in the chimney.

    One more question. Do I understand right that 1000 m3/h fan is good to use, if length 4.80 meters, width 2.80, and height 2.20? I don't use any filter.

  2. The Following 4 Users Say Thank You to THC Prince For This Useful Post:

    GEORGE (25-05-20), Jingo (26-05-20), Krofam (27-05-20), Mac (26-05-20)

  3. #2

    Join Date
    May 2018
    Location
    Chillin' in a tree
    Posts
    4,640
    Thanks
    66,644
    Been Thanked: 25,492 Times

    Default

    4.8x2.8x2.2= 29.568m3

    to make it hourly x60 minutes = 1774m3/hour

    That will replace all the air in the space once a minute.

    NO SELL, NO SMELL, NO TELL!!!


  4. The Following 4 Users Say Thank You to Mac For This Useful Post:

    GEORGE (26-05-20), Jingo (26-05-20), Krofam (27-05-20), THC Prince (26-05-20)

  5. #3

    Join Date
    Sep 2012
    Location
    Out Of The Box
    Posts
    3,710
    Thanks
    31,625
    Been Thanked: 10,588 Times

    Default

    Quote Originally Posted by Mac View Post
    4.8x2.8x2.2= 29.568m3

    to make it hourly x60 minutes = 1774m3/hour

    That will replace all the air in the space once a minute.
    thats if you want to exchange the air one every min. this can cause high neg pressure depending on size of in/out takes.
    i would get an extractor with temp controller to kick in at this speed when in high temps. essentially this is the max rating you will need

    if not running a temp controller then get one that will exchange the air once ever 2 mins instead. so 900m3/ph.


    something to consider is the size of your out take and in take. then look at fans for that.
    for your space i would probably do a 10inch out with 2 passive 8 inch ins.
    or
    an 8inch out and 2 passive 6inch ins.


    in my groom, i exchange the air once every 3mins and have the fan min speed so it does this(roughly 65%). when temps go over my set high temp, its kicks in at full speed. exchanging once every 1-2 mins

  6. The Following 4 Users Say Thank You to Krofam For This Useful Post:

    GEORGE (26-05-20), Jingo (26-05-20), Mac (26-05-20), THC Prince (26-05-20)

  7. #4

    Join Date
    Jun 2018
    Location
    Dark side of the moon
    Posts
    3,852
    Thanks
    3,789
    Been Thanked: 16,454 Times

    Default

    Thats a huge space for 2 little autos

  8. The Following 5 Users Say Thank You to Silkadin For This Useful Post:

    GEORGE (26-05-20), Jingo (26-05-20), Krofam (26-05-20), Mac (26-05-20), THC Prince (26-05-20)

  9. #5

    Join Date
    Nov 2017
    Location
    De Pijp
    Posts
    10,915
    Thanks
    28,179
    Been Thanked: 46,725 Times

    Default

    I wonder how the sealed room guys do so well with little puffs of CO2 here and there

  10. The Following 4 Users Say Thank You to gardro For This Useful Post:

    GEORGE (26-05-20), Krofam (26-05-20), Mac (26-05-20), THC Prince (26-05-20)

  11. #6

    Join Date
    Jan 2018
    Location
    Europe
    Posts
    114
    Thanks
    232
    Been Thanked: 234 Times

    Default

    Thank you for all the replies.

    Do these calculations above are without the odor filter?

  12. The Following 3 Users Say Thank You to THC Prince For This Useful Post:

    GEORGE (26-05-20), Krofam (26-05-20), Mac (26-05-20)

  13. #7

    Join Date
    Sep 2012
    Location
    Out Of The Box
    Posts
    3,710
    Thanks
    31,625
    Been Thanked: 10,588 Times

    Default

    Quote Originally Posted by THC Prince View Post
    Thank you for all the replies.

    Do these calculations above are without the odor filter?
    with mate. and taking into consideration a couple meters of ducting

  14. The Following 3 Users Say Thank You to Krofam For This Useful Post:

    GEORGE (26-05-20), Mac (26-05-20), THC Prince (26-05-20)

  15. #8

    Join Date
    Jan 2018
    Location
    Europe
    Posts
    114
    Thanks
    232
    Been Thanked: 234 Times

    Default

    Quote Originally Posted by Krofam View Post
    with mate. and taking into consideration a couple meters of ducting
    Ok, but what would be the calculation without the odor filter?

  16. The Following 3 Users Say Thank You to THC Prince For This Useful Post:

    GEORGE (26-05-20), Krofam (27-05-20), Mac (26-05-20)

  17. #9

    Join Date
    Sep 2012
    Location
    Out Of The Box
    Posts
    3,710
    Thanks
    31,625
    Been Thanked: 10,588 Times

    Default

    WxLxH. multiply the result by the amount of air exchanges you want per hour. either 20, 30 or 60. (ever 3,2 or 1mins)

    if using carbon filter and ducting. add 10-15% to the WxLxH calculation you made earlier then times by number of exchanges

  18. The Following 3 Users Say Thank You to Krofam For This Useful Post:

    GEORGE (27-05-20), Mac (27-05-20), THC Prince (28-05-20)

  19. #10

    Join Date
    Jan 2018
    Location
    Europe
    Posts
    114
    Thanks
    232
    Been Thanked: 234 Times

    Default

    Quote Originally Posted by Krofam View Post
    something to consider is the size of your out take and in take. then look at fans for that.
    for your space i would probably do a 10inch out with 2 passive 8 inch ins.
    or
    an 8inch out and 2 passive 6inch ins.
    If I would have 900m3/h outtake fan and intake would be 180m3/h fan, then would this intake would be enough? Probably not because of the physics

  20. The Following User Says Thank You to THC Prince For This Useful Post:

    GEORGE (28-05-20)

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


THCtalk.com Disclaimer - You must be over 18 years old to view/use this site .THCtalk.com does not encourage growing Cannabis or possessing Cannabis. Learning how to grow Cannabis instructions should be for educational purposes only. All Information contained in this web site is for: Historical reference, Scientific reference and Educational purposes only. Visitors to this website are advised against breaking the law as It is illegal to smoke, grow, or possess cannabis in the UK and some US States