There are a lot of questions & 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 & 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 & 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 & reused?
There are HEPA models that claim to be washable, 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 & 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 d&er & 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 & changed once a year.
HEPA vs MERV
The MERV rating ranges between 1 & 16 & 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)
HEPA air filters range from 17-20 MERV which is why they are used in hospitals & other surgical-grade clean environments.