Best starting point
Standard 1-inch 16x20 MERV 11
MERV 11
Good filtration and usually easier airflow for standard 1-inch systems.
Check availability linksStandard size guide
16x20 Standard Filter Options
A quick guide for 16x20 standard filter options.
16x20 standard 1-inch and 4/5-inch filter options.
MERV 11 / 12 is a good starting point. MERV 13+ is better filtration; verify airflow on restrictive systems.
- 1SizePrinted on filter
- 2Depth / typeConfirm what fits
- 3MERVChoose filtration
Confirm the type first
AprilAire cabinet mediaTop path when you already have a matching AprilAire cabinet.
Name-brand 4-inchMore media area than 1-inch when the rack supports the correct depth.
Name-brand 1-inchCommon simple option when that is what your system accepts.
Check availability links
These are retail search links only. Verify exact size, depth, brand, price, tax, delivery, and stock before purchasing.
Retail brands to compare: 3M Filtrete, Honeywell, and Lennox.
Standard 1-inch 16x20 MERV 11
3M Filtrete
Honeywell
Standard 1-inch 16x20 MERV 13+
3M Filtrete
Honeywell
Standard 4-inch 16x20 MERV 11
3M Filtrete
Honeywell
Standard 4-inch 16x20 MERV 13+
3M Filtrete
Honeywell
MERV and fit notes
MERV 11 or 12 is often a practical starting point. MERV 13+ can provide better filtration, but restrictive systems should verify airflow/static pressure before upgrading.
4-inch filters usually have more filter media surface area than 1-inch filters. When the size and rack depth are correct, more media area can often help airflow and service life.
1-inch filters are common and easy to replace, but they may load up faster. Higher MERV is not automatically better if the system cannot handle the airflow resistance.
Check your current filter size and depth before ordering. Exact brand availability varies, and retail links do not guarantee current price, tax, delivery, or stock.
For pros: verify size, depth, cabinet, or rail setup before quoting or ordering.