Product Info Catalog HVAC Ventilation Louvers, Vents & Turbines 6PK 2-1/2" Cirk-L-Vent 6PK 2-1/2" Cirk-L-Vent Request a Quote UPC: 35358545309 Manufacturer: Lomanco SKU: 825828 Model Number: L38W 6 Pack, 2-1/2" White Cirk-L-Vent, Prevents Paint From Peeling By Removing Moisture From Wall Cavities.