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Thread: Ventilation Explained

  1. #21

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    Beware of using this method to calculate the ventilation for high-Wattage lamps in smallish spaces (such as tents) — It is insufficient and you will almost certainly end up with temperature problems.

    Example: A 90 cm x 90 cm x 1.8 m (3' x 3' x 6') tent with a 400 Watt lamp, which is fairly typical...

    Step 1:
    3' x 3' x 6' = 54 ft³

    Step 2:
    Every three minutes = 54 / 3 = 18 CFM

    Step 3:
    Lamp + 10 % = 1.8 CFM
    Filter + 20% = 3.6 CFM

    Total = 23.4 CFM

    That's going to lead to a temperature rise of more than 20°C above ambient, which really isn't going to work (unless the ambient temperature is around 5°C or lower).

  2. The Following 2 Users Say Thank You to Anonymiss For This Useful Post:

    121beale121 (09-01-13), GEORGE (07-05-20)

  3. #22

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    What would you say for 1.2 x1.2 x3 H. 600 watt du master blast bulb.

  4. The Following User Says Thank You to 121beale121 For This Useful Post:

    GEORGE (07-05-20)

  5. #23
    flyplane Champion!
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    15.173217024cfm for hot humid for my area haha. I don't think that's going to quite cut it!


    Current diary: Sunshine Daydream, Ugorg#1, BBC multi-strain scrog with lucas formula test
    Previous Stealth Wardrobe Diaries: 1/2/3/4
    Ongoing projects: (PC Veg/Clone Box with 8w T5's)

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    GEORGE (07-05-20)

  7. #24

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    great info
    hope I get to use it if I ever get an indoor setup ready

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    GEORGE (07-05-20)

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