Home | Community | Message Board


World Seed Supply
Please support our sponsors.

Cannabis, Marijuana, Ganja & Greens >> Cannabis Cultivation

Welcome to the Growery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

Amazon Shop: HPS

Jump to first unread post. Pages: 1
InvisibleKenInVic
Tuk U 4:20/24/7/365
Male


Registered: 06/04/17
Posts: 67
Loc: 3rd Rock from the Sun Flag
Cooling and Exhaust Fan Run Time
    #827573 - 07/22/17 03:03 PM (4 months, 24 days ago)

I will be running 400W MH and HPS bulbs in a 3 x 3 x 5.25 tent.  I have a 4" 165cfm duct fan for exhausting the tent and bring in cool air through a 4" filtered passive intake.  My primary concern is cooling while the light is on but I am also worried about the secondary role, which is air exchange in the tent.  Reflector is wing type with no cooling (cheap).

In an effort to keep noise and operating costs down, I am considering putting the fan on the same timer as the lights and have them run parallel to each other.  My rationale is that I don't need to cool things down that I'm not heating up.  My concern then becomes whether the fan down time will cause a problem air quality wise for the plants?

Tent volume without hardware in it is ~47 cu. ft.  In an effort to play along with our government's proposed guidelines on personal grows in the upcoming legislation, it will be confined to accommodating four plants at any one time.

This needs to be thought of in the context of both veg and flower light cycles, which would have fan off periods of 6 and 12 hours respectively.  Thanks for looking.


Post Extras: Print Post  Remind Me! Notify Moderator
OfflineTheman
Stranger
 User Gallery

Registered: 10/06/16
Posts: 328
Last seen: 16 days, 16 hours
Re: Cooling and Exhaust Fan Run Time [Re: KenInVic]
    #827575 - 07/22/17 03:31 PM (4 months, 24 days ago)

Will be fine esp if still has some passive exchange and have fans running inside. Putting it on 1 or 2 times a night couldnt hurt as its not just humidity but co2 but prob wont make much of a dif since not tottaly air tight and not pushing alot of plants


Post Extras: Print Post  Remind Me! Notify Moderator
InvisiblephychotronM
Medicated


Registered: 02/17/11
Posts: 1,895
Loc: Earth (mostly) Flag
Trusted Cultivator
Re: Cooling and Exhaust Fan Run Time [Re: KenInVic]
    #827579 - 07/22/17 09:27 PM (4 months, 24 days ago)

Humidity tends to go up at night and is a good source of powdery mildew. I like to always have an exhaust fan on at night to avoid any of those problems.

I liked my last setup, where I had a booster fan blowing from the veg tent to the flower tent 24/7, then the exhaust fan tied to temperature/humidity device. That way it had a constant flow of fresh air without having to run the larger exhaust fan at night.

You can reduce noise by using a larger size fan and running it on low. An 8" fan on low is quieter than a 4" on full blast.

Hanging the fan with bungee cords from the ceiling helps a lot.


--------------------
Any help given is for educational purposes only. Its your responsibility not to break any applicable laws
Bamboo Bongs I make | Perfect Dry and Cure | Grapegod under LED
“Human beings, vegetables, or cosmic dust, we all dance to a mysterious tune intoned in the distance by an invisible player.” ~ Albert Einstein


Post Extras: Print Post  Remind Me! Notify Moderator
Jump to top. Pages: 1

Amazon Shop: HPS

Cannabis, Marijuana, Ganja & Greens >> Cannabis Cultivation

Similar ThreadsPosterViewsRepliesLast post
* Circulation fans run time? BluntguY 207 1,238 11 11/21/13 08:02 PM
by hamloaf
* exhaust fan MudaFuka 500 3 07/26/15 09:19 PM
by dmtcorey
* Need some help with what exaust fan to get erikm 1,976 7 09/04/09 02:50 PM
by Dr. Penguin
* exhaust fan muffler caseyjones 1,101 2 02/15/12 12:02 AM
by KaptKid
* Exhaust fans skullhuman 1,667 9 02/21/10 11:31 AM
by skullhuman
* Q about using HID lens without exhaust fan ethnoguy 534 0 06/15/09 11:06 PM
by ethnoguy
* Thermoelectrically Cooled Grow Box? camelslaper13 3,964 3 08/08/11 09:12 PM
by camelslaper13
* question about air exchange *DELETED* Pandor 889 7 02/04/11 04:51 PM
by coda

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: FurrowedBrow, Magash, Data, Dr. Siekadellyk, phychotron, Miscusi
201 topic views. 0 members, 105 guests and 88 web crawlers are browsing this forum.
[ Toggle Favorite | Print Topic | Stats ]
Search this thread:
High Mountain Gold Compost
Please support our sponsors.

Copyright 1997-2017 Mind Media. Some rights reserved.

Generated in 0.015 seconds spending 0.002 seconds on 19 queries.