Mitered Corner for Flowbar Diffusers. Flow Cross for Flowbar Diffusers. Flowline™ diffuser assuring proper dimensional layouts for simple diffuser installation. Call Now To Order. Flowline Diffuser Vertical. . Clear. Flowline High Capacity Linear Slot Diffuser · Model 35SST VAV · External Louvre A member of the Nailor Industries International group. FBMC. Architectural Slot. The Flowline™ FLV Series continuous slot diffuser is designed for. Stocked Sizes. Categories: Air Distribution, Linear Diffusers SKU. FL-TZ. Choose an option, 96" Long x 1 1" slot. FBP Architectural Linear Diffuser, Aluminum, 1" Slot. The Flowline™ FLV Series continuous slot diffuser is designed for both ceiling and high sidewall applications and provides total air pattern control flexibility. © Advanced Air (UK). 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. 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.