Filter Types - You can narrow your search by the type of filter needed for your grow room.
Exhaust Filters - are designed to be used on either end of your exhaust fan and will scrub the exhausted as it leaves your garden of any potential odor from your plants. These will only need to be replaced every12-18 months. Inline Filters - will also remove odor like standard exhaust filters do, but they have flanges on both ends of the filter allowing it to be used inline (with ducting attached to both sides). Air Box Filters - have a similar design to an inline filter, but these have replaceable carbon and pre-filters that need to be changed more often. Replacement Pre-Filters are the cloth like material that fits around your filter to help catch any large particulates that would otherwise be sucked through your filter. Replacing your pre-filter will help extend the life of your carbon filter.
Inline Fan Features - Sound insulated walls help muffle the amount of noise the fan makes while running. Built-in speed controller means that you will be able to adjust how strong the exhaust of the fan is.