Carbon Filtration for Odor

[Kiteloop]

Hi Guys

Busy planning a indoor grow for winter. 4 Plants under 320W LED.
I won't be growing in a tent as I have a spare room in the house.

How do you decide what size carbon filter to use?

 

Edited May 8, 2020 by Kiteloop

[PsyCLown]

The filter needs to match the airflow rate.
If your airflow rate is too high, the filter won't be able to filter properly.



Sent from my Redmi Note 7 Pro using Tapatalk

[Ill_Evan]

Quote

How to Calculate Exhaust Fan Strength

In the US, most exhaust fans have a “CFM” rating. This means “cubic feet per minute” and is talking about how much air the fan can move each minute. It’s important to get a fan with the correct CFM rating for your size space.

In addition to CFM, there are 3 sizes that exhaust fans come in as far as diameter (how wide the fan is). They usually come in 4”, 6” or 8”. Generally it’s recommended to get a 6” for most setups, since most air-cooled hoods and ducting have a 6” opening. You can also use converters if you need to convert a 6” hold to a 4” fan. 8” fans are usually used for more high-powered grows.

You probably want a fan with a 6” diameter exhaust fan

Here’s a short equation to help you determine what CFM rating you need for your fan in your space.

How to calculate CFM needed

1. Determine the cubic area of your space by multiplying Length x Width x Height. You want to exhaust this amount of air at least once a minute.

2. Exhaust Efficiency –  Every exhaust system has some level of inefficiency which will lower the amount of air being moved by the fan. This step tells you how much extra air-moving power needed to compensate. In an efficient exhaust system, air goes in a short, straight line after passing through the fan. An inefficient path is when air has to go a long way after leaving the fan, or if the air has to go around turns instead of being in a straight line. This step will help make sure your fan is moving enough air to properly ventilate your space.
   • Efficient path – multiply previous number by 2
   • Inefficient path – multiply previous number by 3

3. Pick your fan. Inline exhaust fans are measured by CFM (cubic feet/minute), so you need a fan that has a CFM higher than the number you figured out in the last step. However, not all CFMs are equal. If something is listed as a “Booster” fan, it typically is no nearly as strong as an inline exhaust fan with a similar CFM.

https://www.growweedeasy.com/exhaust

 

Then once you have a CFM calculated you just match the CFM rating of the carbon filter, but never go over the CFM of the filter otherwise the charcoal won't have enough time to scrub out the smell.

I am actually running my indoor grow without a filter this time around, running the exhaust straight outside. Time will tell if it's ever noticeable. 

Edited May 9, 2020 by Ill_Evan