Just replaced carbon filter + fan and the duct feels like there is less airflow

I went from:

Carbon Filter -> Fan -> Duct -> Outside

to

New Carbon Filter -> New (4") 18" long Duct -> New Fan -> Duct -> Outside

When I touch the ducting, It feels like there is less airflow than the old setup... so I'm wondering if I did something wrong / where my mistake would most likely be? I'll know for sure if it's broken when the lights come back on tonight, and I can see if temperatures are being kept in check...

Old fan was https://www.amazon.com/gp/product/B00D7M6692

New fan is https://www.amazon.com/gp/product/B07JB292JC

I wonder if I put the prefilter onto the Carbon Filter backwards? Could that be a big issue?

It's primarily the new fan.

Your original fan design provides more static pulling power.

TintEastwood said:

It's primarily the new fan.

Your original fan design provides more static pulling power.

Centrifugal Fan vs. Axial Fan

Discover the differences between axial vs. centrifugal fans so you can choose the best type of fan for your application.

www.pelonistechnologies.com

Click to expand...

Ah damn it... was hoping to pull in more air with a "new" fan but I guess I didn't do enough research lol

Well hopefully it still works well enough

jillxjilly said:

Ah damn it... was hoping to pull in more air with a "new" fan but I guess I didn't do enough research lol

Well hopefully it still works well enough

Click to expand...

18inch duct is very big. How many CFM the fan is will be the most important for improving air flow, a high cfm fan through a larger duct may seem like less air but it may just be quieter because the duct is so big. If you have the new fan connected to the old size duct you will be able to tell if it is more or less air flow

I just now realize they're both 4 inch fans. The first is 190cfm and the second is 205

Tint is right, comes down to static pressure

Nizza said:

18inch duct is very big. How many CFM the fan is will be the most important for improving air flow, a high cfm fan through a larger duct may seem like less air but it may just be quieter because the duct is so big. If you have the new fan connected to the old size duct you will be able to tell if it is more or less air flow

I just now realize they're both 4 inch fans. The first is 190cfm and the second is 205

Click to expand...

Sorry I misworded -- it's a 4" duct that's 18" long. can't wait for a few hours to see how temperatures are doing with lights on...

Hmm so far, humidity isn't accumulating so even though it's a lot quieter/I can't "feel" the wind in the duct as much, maybe it's working better anyway...

Looks like it's working great!