How to make Negative Pressure
What is the best way to create negative pressure ? Effective ventilation is key . You ’ ll need two fans : An intake fan that brings cool clean air into the grow room and an extraction fan which removes warm , odor-filled air . The size of your fans depends on the size of your growroom and how much air you need to move . Your extraction fan should always be bigger or more powerful than your intake fan ( maybe even use two smaller fans for outtake if you are worried about noise ), so you can guarantee more air is leaving the growroom than entering . It is always a good idea to buy a more powerful extraction fan than you need because you can run it on a lower , quieter setting and still have enough power to create negative pressure in normal conditions , but also have that extra boost of power if needed on extra hot or humid days . Another effective way to save on energy and equipment costs is to have a simple intake air vent that is twice the size of your outtake outlet and just run one fan for extraction .
Use Acoustic Ducting
Make sure your ducting is efficient too . Buy acoustic ducting to keep airflow noise levels to a minimum and try to keep it as short and straight as possible since your fans ’ performance can be reduced by two per cent for every meter of ducting used . Any change of direction in ducting can slow airflow down and cause condensation . In terms of eradicating odor completely , it ’ s essential you match up the correct size of carbon filter to your exhaust fan , so you can achieve a 0.1 second contact time to efficiently scrub the air passing through the filter .
Hopefully this gives you a better understanding of negative pressure , why we use it , and how it helps plants and growers alike . On top of that , you ' ve just taken a physics class and probably didn ' t even notice . grow cycle 69