All aluminum construction. Includes 8 in x 8 in perma-coated aluminum screen extended to the edges of the cap. Large nailing flange. Rolled flange on vent stack to prevent weather infiltration. A 550S with a taller throat for use on a shake roofs is available. 50 sq-in of net-free ventilating area. 15-3/8 in x 16-1/2 in x 4 in overall size. Online purchases are in packages of 6.
| Id | 149611 |
| SKU | 3856705 |
| PartNo | 550B |
| UPC | 035358317005 |
| Country of Origin |  USA |
| Net Free Ventilating Area | 50 Sq-in |
| Material | Aluminum |
| Color | Black |
| Overall Width | 15-3/8 In |
| Overall Height | 4 In |
| CID | 9 |
