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