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. Clear. FL-TZ. FBMC. Nailor Linear Diffusers and Bar Grilles are engineered and designed to satisfy high performance applications that require an aesthetically pleasing design. Choose an option, 96" Long x 1 1" slot. The Flowline™ FLV Series continuous slot diffuser is designed for. FBP Architectural Linear Diffuser, Aluminum, 1" Slot. Flowline Diffuser Vertical. FlowLine is a custom architectural linear slot diffuser system designed to integrate supply and return air openings into interior commercial buildings. Call Now To Order. Mitered Corner for Flowbar Diffusers. Flow Cross for Flowbar Diffusers. . © Advanced Air (UK). Architectural Slot. FlowLine is a custom architectural linear slot diffuser system designed to integrate supply and return air openings into interior commercial buildings. Flowline™ diffuser assuring proper dimensional layouts for simple diffuser installation. Stocked Sizes. 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.