Product Overview
Extra long life
Will this 20x20x4 filter replace yours?
Yes, if the exact dimensions match. Your replacement filter does not need to be the same brand.
Compare the measurements on your current filter
If they are:
19 3/8" × 19 3/8" × 3 3/4"
49.2 × 49.2 × 9.5 cm
then you have the right size, and this filter fits the same slot.
Sold as 20x20x4.
If you are not sure, call (888) 315-0105 before ordering.
Why choose the Dual 9?
Change your filter less often. The Dual 9 is designed to hold more dust and stay in service longer than a basic pleated filter, while providing MERV 9 filtration.
Useful when filter changes are easy to forget. Fewer changes means less maintenance to remember during the year.
A good fit for hard-to-reach units. It can be especially useful for air handlers in an attic, ceiling or rooftop location where every filter change takes more effort.
Actual filter life depends on how often air moves through it and the amount of dust in and around your home. If your thermostat fan is set to ON instead of AUTO, air passes through the filter more often, so it can fill up sooner.
What it captures
As a MERV 9 filter, it is rated to capture at least:
Large particles
Pollen, dust, mould spores
Medium particles
Fine dust, soot
Minimum efficiencies for MERV 9 under ASHRAE Standard 52.2, the test standard Camfil uses to rate its filters.
Want to know more about the Dual 9?
Our complete Dual 9 guide explains:
- Why the Dual 9 holds more dust and lasts longer than a basic pleated filter
- What the MERV 9A rating means and why it matters
- What can make a filter last longer or fill up faster in your home
- How the Dual 9 compares with MERV 8, MERV 11 and MERV 13 filters
Learn more about the Camfil Dual 9 ›
Other Camfil filters in 20x20x4
Same size. Choose the Camfil filter that fits what matters most to you.
Camfil Farr 30/30, MERV 8
Same filtration as the Aeropleat III, with more media for longer between changes.
View productCamfil AP-Thirteen SC, MERV 13
Captures finer particles than the Dual 9.
View productSee all 20x20x4 filter options
Shipping and returns
Free shipping in most of Canada. Camfil orders received before 11 a.m. Eastern on a business day usually ship the same day.
Returns are accepted within 35 days of receipt. All filters in the box must be new, unused, undamaged and in their original packaging. If even one filter has been installed, used or damaged, the entire box cannot be returned.
Return shipping is your responsibility. If you are unsure about the size, call us before ordering and we will help you confirm it.
Technical specifications
| Brand | Camfil |
| Series | 30/30 Dual 9 |
| Camfil part number | 406332-002 |
| Nominal size | 20 × 20 × 4 in |
| Actual size | 19 3/8" × 19 3/8" × 3 3/4" (49.2 × 49.2 × 9.5 cm) |
| Rating | MERV 9 / MERV 9A, ASHRAE 52.2 |
| Media | Two-layer polyester, 19 sq ft |
| Pleats | 11 per linear foot |
| Rated airflow | 1,380 cfm |
| Initial resistance | 0.27 in w.g. |
Photos are for illustration.
