Brands › Trane › XT80 (TUD1 -H)
Trane TUD1C080G9H41A furnace filter size
This furnace takes a 20 x 25 x 1 filter (not stated (spec table, upflow model) return) or a 20 x 25 x 1 filter (upflow bottom return) or a 17.5 x 25 x 1 filter (upflow side return), depending on where the return air comes in.
Every filter option for this model
| Where return air enters | Filter size (inches) | How many |
|---|---|---|
| not stated (spec table, upflow model) | 20 x 25 x 1 | 1 |
| upflow bottom | 20 x 25 x 1 | 1 |
| upflow side | 17.5 x 25 x 1 | 1 |
Where the filter goes
Upflow: shipped installed in bottom or side location inside blower compartment ("The return air filter are shipped in either the bottom or side location").
The maker ships a filter with this furnace.
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 | upflow/horizontal |
| Heat input | 80,000 BTU/hr |
| Efficiency (AFUE) | 80.0% |
| Model number note | trailing revision letter varies |
| Also sold as | American Standard AUD1C080G9H41A |
How to read a Trane model number
Source
- Trane Product Data XT80 TUD1/TDD1 (-H) Pub. 22-1779-10 (2015) (product data (spec sheet), page 6): document. Read 2026-11-03.
- Installer's Guide 18-CD21D1-15-EN (*UD1/*DD1 -H, XT80) (2015, scanned) (installation manual, page 12): 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.