The TAF-L-V is a variable linear bar diffuser plenum for underfloor perimeter supply applications. The TAF-L-V cooling plenum has an engineered throw pattern that never breaks through the stratification layer created by the UFAD diffusers in the core. The dual aperture plate design allows the TAF-L-V/CT-TAF-L assembly to maintain this engineered throw pattern while modulating the airflow volume. This model can help contribute toward achieving LEED EA Credit 1: Optimize Energy Performance; IEQ Credit 6.2: Controllability of Systems; Thermal Comfort, IEQ Credit 7.1: Thermal Comfort - Design, and if the building utilizes an existing structure, MR Credit 1.1: Building Reuse.