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The Daikin DM80SS / DD80SS furnace uses a 10 x 20, 14 x 20, 14 x 24, 14 x 25, 16 x 25, 20 x 25 or 24 x 24 filter, depending on cabinet width (or model) and return location (per the Daikin document cited on this page). The table below shows which size applies to each cabinet and return.
Verified from manufacturer doc Filter sizes hand-checked against the manufacturer document
Last checked against the manufacturer document:
Model numbers printed in the linked Daikin document (* = any character, as printed):
DM80SS0403A*, DM80SS0603A*, DM80SS0604B*, DM80SS0804B*, DM80SS0805C*, DM80SS1005C*, DM80SS1205D*, DM80SS1405D*, DD80SS0403A*, DD80SS0603A*, DD80SS0804B*, DD80SS1005C*
| Model | Minimum filter size(s) |
|---|---|
| DM80SS0403A* / 0603A* | (1) 16 x 25 (side) or (1) 14 x 24 (bottom) |
| DM80SS0604B* / 0804B* | (1) 16 x 25 (side or bottom) |
| DM80SS0805C* | (1) 16 x 25 (side or bottom) – see note |
| DM80SS1005C* | (2) 16 x 25 (side) or (1) 20 x 25 (bottom) |
| DM80SS1205D* / 1405D* | (2) 16 x 25 (side) or (1) 24 x 24 (bottom) |
| DD80SS0403A* / 0603A* (downflow) | (2) 10 x 20 or (1) 14 x 25 (top return) |
| DD80SS0804B* (downflow) | (2) 14 x 20 or (1) 16 x 25 (top return) |
| DD80SS1005C* (downflow) | (2) 14 x 20 or (1) 20 x 25 (top return) |
Note (DM80SS0805C*): use 2 – 16 x 25 filters on side returns or 1 – 20 x 25 on bottom return if the furnace is connected to a cooling unit over 4 tons nominal capacity. Other sizes of equal or greater dimensions may be used; filters may also be centrally located (per the sheet).
General guidance (not from this manual): check monthly and replace 1-in. filters every 1–3 months, or follow the filter maker's guidance and your owner's manual.
Pull the old filter and read the size printed on its frame. Nominal sizes are rounded up: a 15.5 x 24.5 in. filter is sold as 16 x 25.
Match the size or part number printed on your current filter.
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Your furnace manual lists the filter's dimensions, not its MERV rating. Higher-MERV filters restrict more air. Manufacturers such as Carrier recommend keeping the clean-filter pressure drop under 0.2 in. w.c. (ideally under 0.1). Lennox warns that an over-restrictive filter can trip the high limit in winter and freeze the coil in summer. If you want MERV 11–13, a 4-in. media cabinet is the usual route. Ask an HVAC tech to check static pressure. Nominal sizes are rounded: a filter labeled 16 x 25 x 1 actually measures about 15.5 x 24.5 x 0.75.
SS-DM80SS specification sheet, DM80SS / DD80SS Minimum Filter Sizes
Last checked 2026-10-26. Manufacturers revise documents. If your unit's label disagrees, trust the label.
The Daikin DM80SS / DD80SS furnace uses a 10 x 20, 14 x 20, 14 x 24, 14 x 25, 16 x 25, 20 x 25 or 24 x 24 filter, depending on cabinet width (or model) and return location (per the Daikin document cited on this page). The table below shows which size applies to each cabinet and return. DM80SS0403A* / 0603A* – (1) 16 x 25 (side) or (1) 14 x 24 (bottom); DM80SS0604B* / 0804B* – (1) 16 x 25 (side or bottom); DM80SS0805C* – (1) 16 x 25 (side or bottom) – see note; DM80SS1005C* – (2) 16 x 25 (side) or (1) 20 x 25 (bottom); DM80SS1205D* / 1405D* – (2) 16 x 25 (side) or (1) 24 x 24 (bottom); DD80SS0403A* / 0603A* (downflow) – (2) 10 x 20 or (1) 14 x 25 (top return); DD80SS0804B* (downflow) – (2) 14 x 20 or (1) 16 x 25 (top return); DD80SS1005C* (downflow) – (2) 14 x 20 or (1) 20 x 25 (top return).
General guidance (not from this manual): check monthly and replace 1-in. filters every 1–3 months, or follow the filter maker's guidance and your owner's manual.
Filter sizes are nominal (rounded). A filter sold as 16 x 25 x 1 actually measures about 15.5 x 24.5 x 0.75 in. Buy by the nominal size printed on the frame.
(1) 16 x 25 (side) or (1) 14 x 24 (bottom) (per the Daikin source table).
(2) 14 x 20 or (1) 20 x 25 (top return) (per the Daikin source table).
SS-DM80SS specification sheet, DM80SS / DD80SS Minimum Filter Sizes (https://cdn.daikincloud.io/PIM/Assets/Documents/SS-DM80SS.pdf), last checked 2026-10-26.