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