Drying Tent Air Exchange While Using AC

[BB Boomer]

I'm looking for advice on how often I should exchange the air in my drying tent while pumping in cool air from a portable AC.

I am not allowed to change the climate in our basement says the other half. So I am only changing it inside the drying tent.
The climate in the basement is a constant 72° F and 46% RH.


I will be using a AC Infinity 5x5 tent. The AC Infinity humidifier is outside the tent keeping the RH at 60% inside the tent. The exhaust fan is a AC Infinity 6" inline and is outside on top of the tent. It draws from the vent at the top of the tent and air intake is through the passive vents at the bottom. I don't think I will need a dehumidifier since the lung room air is so dry. The portable AC unit is Hydrofarm Active Air 14k btu and sits outside of tent pumping cold air in through tent side vent. The AC exhaust will be blown into the cold air return.There is also a 6" AC Infinity circulation Fan inside the tent on the floor.

So how often should I exchange the air? I am confused since I lose the cool air each time I do.

 

[Delps8]

I'm looking for advice on how often I should exchange the air in my drying tent while pumping in cool air from a portable AC.

I am not allowed to change the climate in our basement says the other half. So I am only changing it inside the drying tent.
The climate in the basement is a constant 72° F and 46% RH.


I will be using a AC Infinity 5x5 tent. The AC Infinity humidifier is outside the tent keeping the RH at 60% inside the tent. The exhaust fan is a AC Infinity 6" inline and is outside on top of the tent. It draws from the vent at the top of the tent and air intake is through the passive vents at the bottom. I don't think I will need a dehumidifier since the lung room air is so dry. The portable AC unit is Hydrofarm Active Air 14k btu and sits outside of tent pumping cold air in through tent side vent. The AC exhaust will be blown into the cold air return.There is also a 6" AC Infinity circulation Fan inside the tent on the floor.

So how often should I exchange the air? I am confused since I lose the cool air each time I do.

I looked into this a while ago and it really depends on who you want to believe. I have not come across any research on this but I did some Googling and came up with the following info. The first bit is copy and paste from the Excel document and then the links are below that.

Grow Room Atmosphere & Ventilation

Your garden is a living breathing system that needs to take in fresh air and expel waste air and heat. The atmosphere inside of your grow room is just as important than the grow light you choose.

hydrobuilder.com

CFM Calculator: Determining Your Air Flow Needs

CFM calculator to precisely determine the room cubic feet per minute (CFM) required to replace the air in your grow room, based on the fact that your grow room's air need to be renewed at least once every 5 minutes.

www.hydrotekhydroponics.com

The Importance Of Air Circulation In Indoor Cannabis Grow | Fast Buds

Why is air circulation important, how to properly install and measure the exhaust fan you need, and how to exhaust air stealthily!

2fast4buds.com

https://sensiseeds.com/en/blog/grow-tent-ventilation-how-to-calculate-your-needs/

Cannabis Grow Room ventilation Setup Guide | Dutch Passion

The Dutch Passion complete cannabis grow room ventilation guide warns you of the common mistakes to avoid and the pro-tips to embrace.

dutch-passion.blog

Cannabis grow room ventilation: Full guide - CannaConnection

Want to learn how to ventilate your grow tent, closet, or greenhouse? Click here to find out everything there is to know about ventilation for cannabis.

www.cannaconnection.com

Complete Ventilation Guide for Your Cannabis Grow Room - RQS Blog

Is your grow-op properly ventilated? Click here for an in-depth guide on cannabis grow room ventilation, so you can grow bigger, healthier weed plants.

www.royalqueenseeds.com

Ventilation 101 - How to Ventilate Your Grow Space

Ventilation is a vital factor in your plant growth. By supplying fresh air from outside your grow tent, you provide CO2 for your plants, driving their photosynthesis. Expelling the air inside will keep temperature and moisture build-up under control, preventing mold and mildew from inhibiting...

acinfinity.com

Minimum Required Air Exchange Calculator | CTU

Measure air exchange in a grow room with this air exchange calculator. Use this CFM calculator for the proper air exchange when growing weed indoors.

cannabistraininguniversity.com

How to Calculate a Ventilation System | Global Air Supplies

How to Calculate a Ventilation System. Without a reliable and functional ventilation system, plants won’t yield productively.

www.globalairsupplies.co.uk

The Importance Of Airflow When Growing Cannabis

Along with light, nutrients, water, and other key factors, airflow is an important element for the health of cannabis plants, keeping them strong.

www.zambeza.com

Calculating Your Grow Room Fan Size

Do you want to know what sized fan to buy for your hydroponic grow room or indoor garden? We've created an easy to follow guide to ensure you buy the right sized extraction and intake fan for your grow room. Find out your CFM now!

thehippiehouse.com.au

 

[Wastei]

The most important things is to manage stagnant air. The optimal is to dry slow in low temperature ideally 25C/60F , it's not as important to stay on top humidity if you can keep temperature down. I've dried passively many times during winter months, just some light fan moving the air around.

You want to slow down the drying process to preserve terpenes that are more sensitive than Cannabinoid when it comes to drying.
There's no set rule on how often you need to extract the air while drying.

 

[by2]

You should have as little air exchange as possible when drying. just enough so you can manage humidity.
I used to have my extractor turn on for 5 min every 2-4 hours depending on how far in to the dry I was.
I guess you could use the VPD setting on the controller and have the minimum level set to 0 on the extractor.
There is this tread with great info regarding VPD and drying.

 

[BB Boomer]

I really appreciate the good info. I will check out the links. Thank you

 

[Blue brother]

have the ac infinity controller set to turn on the exhaust when the humidity reaches 62% and switch off when it hits 58%, trust me I've been doing this for a long time, 16'c and 58-62% rh is good, colder is better. Your ac probably can't go lower than 16'c so just keep it at that.

 

[xox]

my advice for this is try not to over complicate it too much, as time goes on you will get a natural feel for it. i only started using hygrometers and boveda packs in the past couple years before that i did everything by eye. it also doesn't hurt to pull a flower out and twist one up to see how it burns. each day of the harvest i mark on the line which day the flowers were hung as it sometimes takes me 5 days to clip all of my flowers by hand. you'll get a good feel for knowing when the flowers are dry even if your humidity in the dry room happens to be less than ideal say 45% the main thing is to make sure you get the flowers bucked off of the stems and into jars when the outside of the flowers feels dry that way you can get them into jars and the moisture that remains in the stems will travel to the outside of the flowers and essentially equalizes in the jar when its closed this will help you prevent over drying. dont forget to burp the jars once a day for an hour or so. continue to do that each day until the humidity on the hygrometer is sitting at 62 without having to burp the jar. its much easier to control the humidity inside a small jar with a hygrometer than it is to control a large room especially if you don't have any equipment to control the environment. you can grow great buds with just a light and a fan and some glass jars just need to be mindful and pay attention to the flowers as they dry.

 

[ScroteCombover]

I'm not growing something for 4 months to potentially f it up in dry bc someone who doesn't grow has placed a nonsensical restriction on the space during dry. Tell her be quiet, and get ur dry space in order. Respectfully, of course.

 

[tstick]

Yeah there's a range that you really can't avoid if you're going to dry the plants properly. 60 degreesF (or colder) and 58-62% RH is the ideal. If I had to choose between 57%RH and 63% RH, then I'd choose 57%. If I had to choose between 61 degreesF and 59 degreesF, then I'm choosing 59 degreesF. And I'd try to get a MINIMUM of 14 days of drying under those conditions....and more days, if needed.

72 degreesF and 42%RH isn't going to cut it.You're going to have to man up on this one, my friend!

As far as fans, I use a clip-on fan, lowest setting, set it in the bottom corner of the tent and point it at the floor.....just the minimum air flow as possible. I constantly monitor the conditions. Just as a safety precaution against mold, I also use a UVC sterilizing wand and wave it around the plants every so often -not long enough to degrade the THC, but long enough to kill any potential mld spores. I know it's probably not necessary, but it makes me feel better.

 

[Blue brother]

Yeah there's a range that you really can't avoid if you're going to dry the plants properly. 60 degreesF (or colder) and 58-62% RH is the ideal. If I had to choose between 57%RH and 63% RH, then I'd choose 57%. If I had to choose between 61 degreesF and 59 degreesF, then I'm choosing 59 degreesF. And I'd try to get a MINIMUM of 14 days of drying under those conditions....and more days, if needed.

72 degreesF and 42%RH isn't going to cut it.You're going to have to man up on this one, my friend!

As far as fans, I use a clip-on fan, lowest setting, set it in the bottom corner of the tent and point it at the floor.....just the minimum air flow as possible. I constantly monitor the conditions. Just as a safety precaution against mold, I also use a UVC sterilizing wand and wave it around the plants every so often -not long enough to degrade the THC, but long enough to kill any potential mld spores. I know it's probably not necessary, but it makes me feel better.

This^^^^^

 

[Charles15]

With your setup, you should exchange the air in your tent every 15-30 minutes, depending on the internal humidity level. During drying, maintaining stable RH (60%) is key while avoiding excessive circulation of cold air to prevent over-drying. Adjust and experiment to find the right balance.

ps.
I had a similar cooling issue because every tent opening messed with the temp. XD Check if your circulation fan at the bottom runs continuously – you might just need to reduce the number of air exchanges. If RH drops too quickly, shorten the intervals instead of stopping exchanges completely.

 

[MissinThe90’sStrains]

Winter grows are difficult with low RH, but you can manipulate your environment with tricks. My area is 41% humidity right now, but a small fan blowing on a wet towel brings the RH up to about 60-65% in the drying tent. I leave a few vents open to help with airflow and unzip the tent a little bit to help buffer the humidity. If the buds are drying too fast, buck em and tub em up, with a hygrometer in the tub. Leave lid cracked until humid drops, and then put the lid back on snugly. Watch your RH in the tubs, and burp/leave cracked as needed until humidity stabilizes at 60-62%. Dry trim and then jar. It’s possible, without having to fight with “housemates”.