Overview Reviews Product Description NuTone 843BL - 6" Wall Cap - Black Terminates 6" round duct. Includes bird screen and spring-operated weather louver. Finish: Black Wall Cap Product Videos Custom Field Condition New Product Reviews Write a Review Write a Review × Broan-Nutone NuTone 843BL - 6" Wall Cap - Black Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *