1 Slot - Single Slot - Linear Slot Diffusers

FlowTee for bolt slot ceiling systems, 1 slot Flowbar with factory mounted uninsulated plenum FTB-15 FlowTee for bolt slot ceilings, slot Flowbar

Linear diffuser with single slot damper with deflector, without frame, concealed, complete with insulated plenum - Project Wind

hidden slot Manufacturer of Slot Diffuser

hidden slot diffuser NOTE: The screws are hidden on each side and not seen once installed 1: Depending on the age of your house, it may require a liitle work to get something