140mm to 92mm fan adapter. Let's you mount a 140mm fan in a fan slot that can only fit a 92mm fan. Or a strong 92mm fan more inwards on a 140mm fan slot. It's also possible to mount both a 92mm and 140mm fan to this adapter.If you are using this indoors, PLA+ will be fine. If you need higher temperature resistance (sealed metal enclosures sitting in full sun,etc.) consider PETG (170F/80C with no softening) or ASA (212F/100C with no softening).Comes with the 8 screws you'll need; really easy just screw your 140mm fan to the plate and then the plate to the case or 92mm fan.Fits standard 92mm fans and 140mm slots/fans. Will almost certainly fit unless you have a really strange fan; if in doubt refer to the technical drawing and measure your fan & fan slot. ASK ME QUESTIONS IF YOU'RE NOT SURE!Clearance height is if you are replacing a 92mm fan and it was sitting in a well or some other tight space and you need to move away from the fan slot to get clearance for the enlarging cone of the adapter or the larger 140mm fan.If you are mounting an 92mm where a 140mm fan used to sit, then just pick the minimum clearance height it doesn't matter in your case.This design smoothly enlarges/shrinks between the 92mm and 140mm sizes and has good plenum volume for optimal airflow.Unlike other adapters, this design completely fills in the frame around either fan so everything is still sealed airtight afterwards and your fan works as efficiently as possible providing airflow.If you need an adapter for other sizes to other sizes let me know and I can design one for you.ONLY ONE ADAPTER AND EIGHT (8) SCREWS INCLUDED.