Hi,
so i have a TD Silent 125 extraction fan and a new 125 x 300 5" Rhino filter. The fan is capable of 280m3/h and filter is capable of 500 m3/hr as per their specs. So basically filter should have very low resistance but in reality the air flow is VERY low. Much lower than I had with my previous filter (local EU production / no-name).
Am I going to run into problems with fan because of very high filter resistance?
Hey Power, are you sure you're sizing your fan and filter correctly?
Your fan is 280 m3/h, or roughly 165 CFM (Cubic Feet per Minute.)
Your new filter is rated at 500 m3/h, or about 294 CFM.
Sound likes there's your problem right there bro. You're using too weak of a fan to provide effective filtration.
Your 280 m3/h fan rating is under the assumption there is no air resistance. As soon as you add ducting and especially that filter, you're running at reduced efficiency. Depending on the type and model of fan you're using, there is a maximum amount of pressure the fan will be able to build up. The more air resistance you introduce in your duct, the more pressure drop you'll experience, resulting in reduced airflow (or reduced m3/h.) That 500 m3/h is not a "capable up to", it's the range specified by the manufacturer for operating at it's most effective efficiency. Not all filters are the same, I use 6" carbon filters and depending on the manufacturer, they can be short, tall, skinny, or fat, each with their own m3/h (or CFM) rating. Sometimes that number is static (mine is 470 CFM, or almost 800 m3/h,) or it be in a range, like 250-500.
The idea is to be as close to the HIGH end of that rating (but not over it.) If you exceed your m3/h rating of your scrubber (even after taking into consideration air flow reductions,) you'll be moving air through the filter so fast that it won't have adequate time to effectively trap those odor causing molecules in the carbon.
Move air too slow (like you have going on,) and you're not drawing the air effectively through the scrubber, meaning it's working at a much reduced efficiency, and also increasing the heat on your fan, which will wear it out faster.
My suggestion would be to either see if they will exchange for a filter more appropriately sized to your fan (while still keeping in mind if the filter is large and effective enough for your grow space,) or get yourself a fan that is more appropriately sized to your scrubber.
Just my "My 2 cents" :karma Cloud:
