There are a lot of questions and speculation surrounding HEPA air filters in grow rooms. For people who are serious about growing, utilizing best practices is a no-brainer, however it's criticial to understand why and how methods work to ensure efficiency.
In an effort to provide growers with accurate information about HEPA filters, We've created this guide to clear up answers to some of the most commonly asked questions.
What type of HEPA filter is best for a grow room?
TRUE HEPA filters provide the highest standard of clean for indoor grow rooms.
Will HEPA filters remove mold spores?
No. If plants are infected before implementing a HEPA filter it will not remove mold. HEPA filters prevent mold and should be established before starting the growing process.
Will a HEPA filter remove smells?
In short, yes but not efficiently. If odors are your main concern you're going to want a carbon filter. HEPA filters focus on overall air quality vs. odor control.
Can HEPA filters be washed and reused?
There are HEPA models that claim to be washable and there is even a wikiHow on how to clean HEPA filters however, there are a few important things to note
• If you wash HEPA/ TRUE HEPA filters they will fall apart
• There is no confirmation that these washable filters work after being cleaned
• Removing AND cleaning a HEPA filter in or near a growing area is a serious risk of contamination
Which HEPA filter is best?
If you are looking for a true medical-grade clean room environment, TRUE HEPA filters are best.
HEPA vs TRUE HEPA
• HEPA filters capture 99% of particulate that is 2 microns or larger (pet dander and dust)
• TRUE HEPA filters capture 99.97% of particulate down to 0.3 microns (anything under 50-60 microns is invisible to the human eye)
When should HEPA filters be changed?
In normal grow room environments, TRUE HEPA filters can last up to 4 years. In commercial environments, HEPA filters should be checked every 6 months and changed once a year.
HEPA vs MERV
The MERV rating ranges between 1 and 16 and is based on how small of particles a filter can collect. The higher the MERV rating the better the quality of the filter.
• Low MERV: 1-4
• Medium MERV: 5-13
• High-Efficiency MERV: 13-16 (collects particles as small as 0.3 microns @ 75% efficiency)
Use our sizing calculator to help you determine which unit is best for your room and how many units you need to acheive proper air circulation.
|Room Measurements (feet)|
To clean Square Feet, you will need:
A CleanLeaf media air cleaner is considered an "ambient air cleaning system" designed to run ambient shop air through a series of high efficiency filters and/or carbon depending on the application. When sized for 8-10 air changes per hour, you will create a constant reduction in the amount of airborne particulate in the room between 70-90%. We always recommend capturing the particulate at the source when possible but understand source capture is not always an option. Blue Ox air cleaners are often used as a secondary filtration system to source capture or when source capture is not applicable.
1. First, we determined the air changes per hour requirement from the following:
2. Second, we determined the required CFM for your application:
Sq Footage = Length x Width x Height (We use 12' by default)
Total Required CFM = Sq Feet x 8 Air Changes per hour / 60
3. Determine the total number of units required:
Total Units = Total Required CFM / Unit CF Rating
For Example: 12,000 Required CFM would require (4) 3,000 CFM units