How to install a linear SLOT DIFFUSER in acoustical ceiling grid

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ceiling slot diffuser Architectural Linear Diffuser, Aluminum, 1 Slot FL-15 Architectural Linear Adjustable gasket-tipped blade plenum slot diffuser for narrow tee ceiling

ceiling slot Linear slot diffusers Foam gasket is sealed around the back of the frame as option to avoid air leakage Suitable for installation for ceiling and sills  Linear slot diffusers can be ceiling or wall mounted Linear slot diffusers were designed to supply warmcold air They are available in versions with