Loss of fan pressure from carbon filter

[Jake hammer]

I bought two 6 inch hyperfan with carbo carbon filters.
One is working perfect but on the other when I attach the fan too the filter the power goes down nearly too nothing.
The filter is about a month old so can't be clogged ect and looks OK.
I can't understand at all why Im getting this problem.
All I could think somehow a faulty carbon filter.
Currently no matter how much I turn it up makes no difference. But the fan works as it should when not attached too the filter.

[Blue61]

I bought two 6 inch hyperfan with carbo carbon filters.
One is working perfect but on the other when I attach the fan too the filter the power goes down nearly too nothing.
The filter is about a month old so can't be clogged ect and looks OK.
I can't understand at all why Im getting this problem.
All I could think somehow a faulty carbon filter.
Currently no matter how much I turn it up makes no difference. But the fan works as it should when not attached too the filter.

Taking a shot in the dark here but did you make sure the felt sleeve is not stuffed in to the end of filter?

[Jake hammer]

Taking a shot in the dark here but did you make sure the felt sleeve is not stuffed in to the end of filter?

The white pre filter is on but nothing else. I called the store they can't understand.

[Jake hammer]

Took filter back too store.
Was faulty carbon filter