Phat Filter, 4" x 12", 200 CFM

Carbon Filter With Full-Thickness Beds, 4" x 12", 200 CFM

A carbon filter's odor-control capacity comes down to how much carbon it actually holds and how dense that carbon bed is, and filters that round dimensions up on paper often fall short in practice. Every Phat Filter is built with full-thickness carbon beds at the actual stated dimensions, not a rounded-up figure, so the rated capacity matches what's really inside.

This 4" x 12" filter is rated for 200 CFM of airflow, matching the filter to fans operating in that range.

Key Features & Benefits

• Full-thickness carbon beds — built to the actual stated dimensions rather than a rounded-up figure.
• Rated for 200 CFM — matched to fans operating in that airflow range for reliable odor control.
• Dense carbon packing — supports consistent performance across the filter's full service life.
• Pre-filter compatible — a matching Phat Pre-Filter wrap is available to extend the carbon bed's service life.

Who Should Use This Carbon Filter

Growers running an inline exhaust fan who need a carbon filter sized and CFM-rated to match that fan, rather than guessing at capacity.

About Phat

Phat builds carbon filters and matching pre-filter wraps as a paired system, sizing each filter's stated carbon bed dimensions to the CFM rating printed on the product.

Frequently Asked Questions

What size is this filter?

This filter measures 4" x 12". Match that size to your available mounting space and the ducting you plan to run from it.

What CFM is it rated for?

It's rated for 200 CFM of airflow. Pair it with a fan operating at or near that rating for the odor-control performance the filter is built to deliver.

Does this filter use a pre-filter?

Yes, a matching Phat Pre-Filter wrap is available and slides over the carbon filter to catch dust and debris before it reaches the carbon bed, extending the filter's usable life. Using the matching pre-filter is an easy way to protect your investment in the carbon bed itself.

How is filter capacity determined?

By carbon quantity and carbon quality together. A denser, full-thickness bed at the actual stated dimensions holds more capacity than a thinner bed of the same nominal size.