FBP Architectural Linear Diffuser, Aluminum, 1" Slot. Stocked Sizes. FlowLine is a custom architectural linear slot diffuser system designed to integrate supply and return air openings into interior commercial buildings. The Flowline™ FLV Series continuous slot diffuser is designed for both ceiling and high sidewall applications and provides total air pattern control flexibility. Flowline™ diffuser assuring proper dimensional layouts for simple diffuser installation. Choose an option, 96" Long x 1 1" slot. FlowLine is a custom architectural linear slot diffuser system designed to integrate supply and return air openings into interior commercial buildings. Flowline Diffuser Vertical. © Advanced Air (UK). FBMC. Nailor Linear Diffusers and Bar Grilles are engineered and designed to satisfy high performance applications that require an aesthetically pleasing design. Mitered Corner for Flowbar Diffusers. Nailor Linear Diffusers and Bar Grilles are engineered and designed to satisfy high performance applications that require an aesthetically pleasing design. Flow Cross for Flowbar Diffusers. Call Now To Order. . Categories: Air Distribution, Linear Diffusers SKU. FL-TZ. Architectural Slot. The Flowline™ FLV Series continuous slot diffuser is designed for. Clear. Flowline High Capacity Linear Slot Diffuser · Model 35SST VAV · External Louvre A member of the Nailor Industries International group.