| Brand | Tjernlund |
| Type | Shock Absorber |
| Item Height | 4 in |
| Model | Tjernlund BD-4 |
| MPN | BD-4 |
| UPC | 080956437006 |
The Tjernlund BD-4 Spring Return Backdraft Damper is a shock absorber designed specifically for 4" ducts. This model from Tjernlund is designed to help control backdrafts and provide a safe and efficient ventilation solution. With free express shipping available in the United States, this product offers a convenient and reliable option for HVAC professionals and property owners looking to improve their ventilation systems.