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