Filtering incoming air?

I'm repurposing an existing dryer vent out of my room. I've replaced all the pipe so I'm not sucking lint into everything, and I've basically got a 12' straight pipe going outdoors from my room. What is the best way to filter the incoming air? Put a carbon filter inline with a fan pulling it in from the outside? Or build a filter 'box' with some AC filters? A filter on the outside of the house at the vent (could be pretty easily concealed where it's located? Something else?

Suggestions appreciated.

You don't need a carbon filter on incoming air. I would put some form of filter like a heater filter to catch larger particulate matter. If you live ANYWHERE near where another person is growing pot then you will want to stop any pollen a sloppy grower might have let fly. In fact I use HEPA filters I have adapted from the vacuum parts section of Wal Mart. These are high flow, ultra-filtration units to clean allergens from your air. Depending on the model/make of vacuum they have a round or square fitting/opening that is easy to adapt using cheap radiator clamps from Pep Boys or wherever.

If it's air to cool your lights that will be pulled from and exited to outside enclosed then you need no filters.

On a round dryer vent pipe (if grill is removed outside) you could even mount a motorcycle air filter with a small filter. Of course the meter reader might wonder.

Good point about the pollen, hadn't thought about it. A HEPA filter would be pretty easy to put inline. The incoming air will hit a wye split, one of which is for lights, one of which is for ambient air, so it def needs filtering.

Thanks!

Baywatcher said:

Good point about the pollen, hadn't thought about it. A HEPA filter would be pretty easy to put inline. The incoming air will hit a wye split, one of which is for lights, one of which is for ambient air, so it def needs filtering.

Thanks!

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Yeah make the most of your filter by pushing only the air that needs to be filtered through it. And I would put that filter just before the exit point of that room air.

It looks like I could kill two birds with one stone with this: Fantec FB6

Hepa filter like Hot Rod said.