Brands › Trane › XB90 (TDC1)
Trane TDC1B040A9241A furnace filter size
This furnace takes 2 filters, each 14 x 20 x 1 (downflow top (external, in return duct) or downflow top (external)).
Every filter option for this model
| Where return air enters | Filter size (inches) | How many |
|---|---|---|
| downflow top (external, in return duct) | 14 x 20 x 1 | 2 |
| downflow top (external) | 14 x 20 x 1 | 2 |
Where the filter goes
Downflow: outside cabinet in return duct on factory-supplied brackets; filters not furnished.
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 | 17.5 in. |
|---|---|
| Airflow direction | downflow/horizontal |
| Heat input | 40,000 BTU/hr |
| Efficiency (AFUE) | 92.1% |
| Model number note | trailing revision letter varies |
| Also sold as | American Standard ADC1B040A9241A |
How to read a Trane model number
Source
- Trane Product Data XB90 TDC1 Pub. 22-1670-10 (2015) (product data (spec sheet), page 6): document. Read 2026-11-03.
- Installer's Guide 18-CD19D5-35-EN (*UC1/*DC1, XB90) (2019) (installation manual, page 11): 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.