Consider interventions to the space to accommodate air volume and airflow.
 Enclosed room |
 Fully louvered door |
 Upper and lower door grilles |
 Inlet or exhaust ducting and half-louvered door or single door grille |
 Inlet and outlet ducting |
|
|---|---|---|---|---|---|
| > 700 ft3 | ✓ | ✓ | ✓ | ✓ | ✓ |
| 84 - 700 ft3 | ✓ | ✓ | ✓ | ✓ | |
| < 84 ft3 | ✓ | ✓ | |||
| Minimum Room Dimensions (ft) | 8 x 8.75 x 10 | 3 x 3.5 x 8 | 3 x 3.5 x 8 | None | None |
| Ducting should occur within the conditioned space to prevent positive or negative pressurization of the home. Use insulated flex duct (e.g., R-6) or insulate rigid duct to prevent condensation. Upper and lower door grilles should provide 250 square inches total Net Free Area (e.g., two 18 inch x 8 inch grilles), and have 5 feet of separation. | |||||