| Curb Extension -Vented 29.5"X29.5" | $399.00 | | |
| Curb Extension -Vented 33.5"X33.5" | $394.00 | | |
| Damper Tray, Accommodates 10 In Damper installed in Roof Curb Model GPI-17 | $16.00 | | |
| Damper Tray, Accommodates 10 In Damper installed in Roof Curb Model GPI-19 | $19.00 | | |
| Damper Tray, Accommodates 12 In Damper installed in Roof Curb Model GPI-19 | $19.00 | | |
| Damper Tray, Accommodates 12 In Damper installed in Roof Curb Model GPI-22 | $22.00 | | |
| Damper Tray, Accommodates 16 In Damper installed in Roof Curb Model GPI-22 | $22.00 | | |
| Damper Tray, Accommodates 18 In Damper installed in Roof Curb Model GPI-30 | $30.00 | | |
| Damper Tray, Accommodates 24 In Damper installed in Roof Curb Model GPI-34 | $34.00 | | |
| Damper Tray, Accommodates 30 In Damper installed in Roof Curb Model GPI-40 | $40.00 | | |
| Damper Tray, Accommodates 8 In Damper installed in Roof Curb Model GPI-17 | $16.00 | | |
| Damper Tray, Accommodates 8 In Damper installed in Roof Curb Model GPI-19 | $19.00 | | |
