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