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