FAQ

Each box generator has a filter size on the listing. The smallest size can fit a 12x12x1 and the largest fits 20x30x1. We recommend Filtrete Merv 13 or 14 (1900-2800) but other brands fit as well. Visit the BUILD IT page for a working list of products.

The 12x12 box accepts 120x120x25mm PC fans.

The 20x20 and the 20x30 both fit 140mm fans that are either 25mm or 27mm thick. You will have a spacer included in the shipment that will work with 25mm thick fans.

For a list of products that have been verified to work with the boxes, visit the BUILD IT page.

You will receive the outer box, inner and outer grills, spacers (if needed) and an instruction sheet. All electronics, cords and filters are NOT included and the responsibility of the consumer to purchase separately. Visit the BUILD IT page for recommended brands, links and tips for assembly.

It usually takes us 7-10 days to make and ship an order.

Not necessarily — in most homes, a MERV 13 or 14 filter actually performs better than HEPA, and here’s why:

1. More air changes = more real-world protection
HEPA filters are extremely dense, which means they move less air. A MERV 13–14 filter can move far more airflow, allowing your purifier to clean the entire room several times in the same amount of time it would take a HEPA system to clean it once.
More airflow → more ACH → cleaner air overall.

2. MERV 13–14 already captures the particles that matter
MERV 13/14 captures a very high percentage of the same particle sizes HEPA is known for (including smoke, PM2.5, and airborne pathogens). In a home environment, the difference in particle capture is far smaller than the difference in airflow—and airflow is what determines room-wide protection.

3. Cost matters
MERV 13–14 filters are significantly cheaper than HEPA filters. They’re also easier to find, last a long time, and reduce the ongoing cost of maintaining good indoor air quality.

Bottom line:
A HEPA filter captures slightly more per pass, but a MERV 13–14 filter cleans far more total air per hour. In real homes, more air cleaned more often beats “perfect” filtration every time.