Using a carbon filter with under rated fan...

I have an 800cfm Rhino Fan. I use it with a variac controller, it puts out about 400cfm when on it's second setting (out of five).

If I use a carbon filter rated for a 800cfm, with a fan working at 400cfm, will the filter still be effective 1? I figured it will be drawing the air through the filter slower, hence creating more contact with the carbon and less chance of odour being emitted.

I'm trying to build margins into my design in the event I need to up the exhaust speed due to temperature spikes, but like many of you, want to run an overrated fan at a lower speed to reduce noise levels.

Thanks in advance

K

Yes. The filter will be more effective. Sorry Kieron, you probably wanted other opinions since you know mine from your other thread. But I can guarantee the filter will be more effective. Just never do it the other way around.
Even if you match your 800cfm fan and ran it full whack with an 800cfm filter your still good because the filter and ducting will take at least 25% off the fan. Some fans like box fans reduce output by 50% with 1m of duct and a filter without any bends.

Yes, the filter will work fine. What you don't want is a fan that exceeds the filters rating.

Wicked.

Thanks a lot !