I got a 4K room 22'x9' in my basement. I want to cool it using outside air. There's a 4in vent in the room that's inbetween the glass block. I was thinking of cooling it using a 4in inline fan that just blows in the room which would be hooked up to thermostat to come on when the temp gets around 80deg. I'm going to vent the lights themselves in the room nextdoor. I'm a rookie and would appreciate any advice. I'm confused on how to block the air when the intake fan is off. The 4 inch and was looking at is 175 CFM. OR would it be wiser to using and 6in fan and use a reducer for the 4 inch opening.
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Pulling outside air in
- Thread starter Mrgstack
- Start date
You have a few things you need to take into account. First off, seasonal changes are usually big so keep that in mind when sizing your fans. I would use the six inch and reduce it to four on a dial so you can have speed control. Venting the lights into your next door room will bring humidity so keep that air moving out. There are dampers that open with fan pressure and close when they are not in use. Some are in-line(butterfly) and some are for punching out through a wall like an over sized dryer vent. Keep your environment as stable as you can and draw your air through a filter to keep out unwanted pests.
Can I use a screen like the kind you use for a window to keep unwanted pest out. I wasn't quite sure what to use because I didn't want to restrict the air flow. Could some like pantie hose work? Thanks for the tips. Im going with the 6in and getting a controller for it. I'm on a hunt for one of those dampers. I found a few a Lowes but they didn't have any that open when you suck air in. Only for exhausting air. If you have a link or a picture of one please post. It's for a 4 inch opening.
i pull outside air in to cool my room in the winter. I use a ranco temp controller to control the fan when temps reach 80. I haven't gotten around to it yet but what you need is a damper and a filter for the end. you can build a box and use a furnace filter or buy a cone filter. the damper and cone filter will need to be bought at a local grow shop or almost any online store.
Terpz
Member
Gstack, you need one of these https://www.hydrofarm.com/p/ACBD6
better
I always like to pull from the house and vent filtered air outside, preferably up a chimney, flowering at night
Because :
Air from inside the house varies between 15 and 25 degrees, often less, air from outside usually varies a lot more, this is not good for your No1. Goal, keeping the garden environment within productive limits, temperature and RH
Vent outside, humidity, low CO2 levels, smells are all best outside
Better still up the chimney because smells, noises and hot air are carried far away and anybody looking at the property with ir/heat detection sees something normal
Flowering at night because outside temperatures are lower and also, often overlooked, ambient CO2 is as much as double daytime levels.This is especially noticeable in rural areas.
Because :
Air from inside the house varies between 15 and 25 degrees, often less, air from outside usually varies a lot more, this is not good for your No1. Goal, keeping the garden environment within productive limits, temperature and RH
Vent outside, humidity, low CO2 levels, smells are all best outside
Better still up the chimney because smells, noises and hot air are carried far away and anybody looking at the property with ir/heat detection sees something normal
Flowering at night because outside temperatures are lower and also, often overlooked, ambient CO2 is as much as double daytime levels.This is especially noticeable in rural areas.
I really just wanted to take advantage of the colder temps outside to save money. I'm in the Midwest and it's freezing over here. I was thinking that by hooking inline fan to bring in air from the outside would do that. I was going to use a temp controller to turn the fan on if it gets over 80 degrees. Is this wise? Or normal so to speak
St. Phatty
Active member
Where does the extra night-time CO2 come from ?
The one time I had a chance to measure "goes in, goes out" on a compost pile, it was 12 cubic yards in, 4 out - halfway through the process.
The instructor was reluctant to talk about it because he managed a facility that would have to pay a LOT if it was charged for CO2 emissions.
Long story short, about 80% of a compost pile goes up as CO2. I wouldn't believe it if I hadn't seen it. Also, in nature it happens over a longer period of time than when you are hot composting (years instead of weeks).
So, whatever the number, that's one source of CO2. Because bacteria are so involved in helping break up plant matter, I suspect a lot of that CO2 is just the collective exhales from a whole bunch of tiny little animals.
But - plant matter de-composition happens 24/7. I didn't think dead plants de-composed faster at night - unless there was another factor, like rain.
It is caused by photosynthesis, not composting
The swings in rural areas are larger than urban, due to the vegetation around absorbing CO2 in daylight and excreting it at night
