How to Adjust the Pattern Controllers on Linear Diffusers

How to Adjust the Pattern Controllers on Linear Diffusers mud in linear slot diffuser Linear Slot Diffuser · Type H mudah 4d slot Mount No Hardware 52-1 =Tape and Using a screwdriver or drill, tighten the screws to pull the linear slot diffuser up into the opening

mudah 4d slot I don't get why linear diffusers aren't more common I've done only one house with linear mud-in supply and return in master bedroom

slot joints Wing Shing Air-Flow Shop 22 Mud in Flange Flush Mount Linear Slot Diffuser HVAC Air Vent in Matte White Commercial Grade online at a best price in India  However he said it might work better if were using the metal linear slot diffusers that go on the sheetrock that are more visible but still