# Exhaust fan,can I turn it off? **URL:** \ **Category:** Lighting\ **Created:** [June 1, 2017, 7:45pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639 "2017-06-01T19:45:21Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Laurap](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/laurap/32/41181_2.png) [@Laurap](https://ilgmforum.com/u/Laurap)\ **Post date:** [June 1, 2017, 7:45pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/1 "2017-06-01T19:45:21Z")
Hubby wanted me to ask if during the girls night time with two fans inside and a duct fan on bottom pulling air in do we need exhaust on,? ---
**Author:** ![Wishingilivedina420state](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/wishingilivedina420state/32/115327_2.png) [@Wishingilivedina420state](https://ilgmforum.com/u/Wishingilivedina420state)\ **Post date:** [June 1, 2017, 7:48pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/2 "2017-06-01T19:48:03Z")
Mine is set to the timer to turn off when the light does. But that’s me.👽 You should be ok if you have desktop fans in the tent. ---
**Author:** ![Wishingilivedina420state](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/wishingilivedina420state/32/115327_2.png) [@Wishingilivedina420state](https://ilgmforum.com/u/Wishingilivedina420state)\ **Post date:** [June 1, 2017, 7:49pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/3 "2017-06-01T19:49:18Z")
Please post pic of plant to be safe…lol 😆😉😄 ---
**Author:** ![Hogmaster](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/hogmaster/32/619897_2.png) [@Hogmaster](https://ilgmforum.com/u/Hogmaster)\ **Post date:** [June 1, 2017, 7:58pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/4 "2017-06-01T19:58:39Z")
I guess it would depend on the temperatures with the fans off if it’s within range I see no harm depending on if it’s flowering to and you’re using a carbon filter or not but you should be fine as long as your temperatures are within range ---
**Author:** ![Hogmaster](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/hogmaster/32/619897_2.png) [@Hogmaster](https://ilgmforum.com/u/Hogmaster)\ **Post date:** [June 1, 2017, 7:59pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/5 "2017-06-01T19:59:30Z")
Might’ve been running for almost a year I don’t shut them off but I have to keep them running for my temperatures to stay where they need to be Hope that helps happy growing 🕶 ---
**Author:** ![Laurap](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/laurap/32/41181_2.png) [@Laurap](https://ilgmforum.com/u/Laurap)\ **Post date:** [June 1, 2017, 8:11pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/6 "2017-06-01T20:11:06Z")
![](https://global.discourse-cdn.com/growingmarijuana/original/3X/4/9/49503e6d4b872f8c94e7af38ac6aa251eb543620.jpg)thanks so much. I as well wish for the same maybe 2019. Yikes ---
**Author:** ![Laurap](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/laurap/32/41181_2.png) [@Laurap](https://ilgmforum.com/u/Laurap)\ **Post date:** [June 1, 2017, 8:12pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/7 "2017-06-01T20:12:45Z")
Since I’m in SW USA you’re absolutely right. Wasn’t thinking exhaust did much during sleep, but as temp are already 90+ here, think I’ll keep it on. ---
**Author:** ![Zombo](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/zombo/32/33053_2.png) [@Zombo](https://ilgmforum.com/u/Zombo)\ **Post date:** [June 1, 2017, 9:14pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/8 "2017-06-01T21:14:28Z")
@Laurap @Hogmaster… I have had no issues w/ temps, during the day I leave my tent open with fans inside blowing, but when I close it at night, I put on my exhaust at half because the RH goes up… Lately at night when lights go off and tent is zipped, temps drop and RH goes up! ---
**Author:** ![McLovin777](https://avatars.discourse-cdn.com/v4/letter/m/73ab20/32.png) [@McLovin777](https://ilgmforum.com/u/McLovin777)\ **Post date:** [June 1, 2017, 9:27pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/9 "2017-06-01T21:27:19Z")
Humidity will rise also with the exhaust fan off, mine goes to high 80s at lights out, very annoying, just something to keep in mind. ---
**Author:** ![Ron330](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/ron330/32/39831_2.png) [@Ron330](https://ilgmforum.com/u/Ron330)\ **Post date:** [June 1, 2017, 9:27pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/10 "2017-06-01T21:27:36Z")
I always keep my exhaust fan on, and my intake, just to keep fresh air moving in and out… And I have also read here about negative pressure, I will have to find it, but a few people have said negative pressure in the tent is good for the plants (negative pressure = more out take than intake), something you may want to look in to or read up on… ---
**Author:** ![Zombo](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/zombo/32/33053_2.png) [@Zombo](https://ilgmforum.com/u/Zombo)\ **Post date:** [June 1, 2017, 9:46pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/11 "2017-06-01T21:46:29Z")
@McLovin777, I hear ya… Same here… Seems like there is an inverse relation to temp and RH…where I am at least… Temps go lower and the RH seems to go up ---
**Author:** ![McLovin777](https://avatars.discourse-cdn.com/v4/letter/m/73ab20/32.png) [@McLovin777](https://ilgmforum.com/u/McLovin777)\ **Post date:** [June 1, 2017, 9:49pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/12 "2017-06-01T21:49:31Z")
Soo true! Can’t wait to get this chill nute stuff so I can use all lights on max, the humidity should drop and plants flourish at 84 - 85 F ---
**Author:** ![Zombo](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/zombo/32/33053_2.png) [@Zombo](https://ilgmforum.com/u/Zombo)\ **Post date:** [June 1, 2017, 9:50pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/13 "2017-06-01T21:50:34Z")
@McLovin777, what product are you talking about?.. New nutrient product? ---
**Author:** ![McLovin777](https://avatars.discourse-cdn.com/v4/letter/m/73ab20/32.png) [@McLovin777](https://ilgmforum.com/u/McLovin777)\ **Post date:** [June 1, 2017, 9:55pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/14 "2017-06-01T21:55:20Z")
Loads of brands do it, Google vitalink chill, amazing stuff from the sounds of things… helps plants not only cope with above 83 F but actually thrive! Sounds too good to be true… all the brands I’ve seen have the same description ---
**Author:** ![Zombo](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/zombo/32/33053_2.png) [@Zombo](https://ilgmforum.com/u/Zombo)\ **Post date:** [June 1, 2017, 9:57pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/15 "2017-06-01T21:57:16Z")
@McLovin777… I’m in soil, that’s for reservoirs, hydro? ---
**Author:** ![McLovin777](https://avatars.discourse-cdn.com/v4/letter/m/73ab20/32.png) [@McLovin777](https://ilgmforum.com/u/McLovin777)\ **Post date:** [June 1, 2017, 9:59pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/16 "2017-06-01T21:59:33Z")
Hmm… I’m sure you can get one for soil, look around dude, theirs no way they would leave such a huge market untouched ---
**Author:** ![Zombo](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/zombo/32/33053_2.png) [@Zombo](https://ilgmforum.com/u/Zombo)\ **Post date:** [June 1, 2017, 10:00pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/17 "2017-06-01T22:00:40Z")
@McLovin777, just looked it up, cool product… It’s for hydro and soil… Cool tip thx ---
**Author:** ![Laurap](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/laurap/32/41181_2.png) [@Laurap](https://ilgmforum.com/u/Laurap)\ **Post date:** [June 1, 2017, 11:38pm UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/18 "2017-06-01T23:38:12Z")
Was re-reading my replies & you said if I use a carbon filter or not. I do, bit what exactly do they do except cut out smell? ---
**Author:** ![Jmesser80](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/jmesser80/32/41138_2.png) [@Jmesser80](https://ilgmforum.com/u/Jmesser80)\ **Post date:** [June 2, 2017, 12:22am UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/19 "2017-06-02T00:22:02Z")
I have mine on a separate timer, I have it on whenever the light is on and then I have it turn off 30 min then back on for 30 min and so on until the light comes back on. I like to circulate the air so my humidity doesn’t get jacked up at nighttime. My tents humidity spikes up when the lights are off. ---
**Author:** ![Jmesser80](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/jmesser80/32/41138_2.png) [@Jmesser80](https://ilgmforum.com/u/Jmesser80)\ **Post date:** [June 2, 2017, 12:24am UTC](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639/20 "2017-06-02T00:24:08Z")
Mine does the same thing. I don’t mind during Veg but during flower, not so much. [Next page](https://ilgmforum.com/t/exhaust-fan-can-i-turn-it-off/11639.md?page=2)