York Y81E100C20LMPS1 furnace filter size
This furnace takes 2 filters, each 16 x 25 (side (two side returns)) or a 20 x 25 filter (bottom return), depending on where the return air comes in.
The maker lists width and height only. Most filter racks next to a furnace hold a 1-inch filter; a separate filter cabinet usually holds a 4- or 5-inch one. Check the thickness printed on the edge of your old filter before you order.
Every filter option for this model
Where the filter goes
external to cabinet: field-supplied side-return rack and/or bottom-return rack, or filter at a return grille; not supplied
The maker does not ship a filter with this furnace. The size above is the maker's recommended size at the furnace; if your home has a filter grille in a wall or ceiling, that grille sets the size instead.
How often to change it
General guidance, not from the maker's table: 1-inch filters every 1 to 3 months; 4- and 5-inch filters every 6 to 12 months. Change sooner with pets, smoking or construction dust.
About this model
| Cabinet width | 21 in. |
|---|---|
| Airflow direction | multi-position (upflow/downflow/horizontal); L = low NOx |
| Heat input | 100,000 BTU/hr |
| Efficiency (AFUE) | 80% |
| Model number note | trailing revision digits/letters vary |
How to read a York model number
Source
- York Y81E Technical Guide 6368917-YTG-B-1024 (technical guide (spec sheet), page 9): document. Read 2026-11-03.
- York Y81E Installation Manual 6100757-UIM-C-1124 (installation manual, page 24): document. Read 2026-11-03.
Check that the model number on your furnace label matches, and compare with the size printed on your old filter. If they differ, go by the filter that fits your rack.