The P8-4040-2N180 aluminum profile measures 40mm × 40mm, with a T-slot of 8.2mm. This profile features smooth surfaces on three sides for aesthetically pleasing and easy-to-clean finish, while one side is a slot for assembly with other profiles or necessaries. The P8-4040-2N180, along with the 2N90 and 1N, are all developed for constructing frames requiring high airtightness but designed for different sections of the frame: the 2N180 and 1N are suitable for intermediate sections, while the 2N90 is suitable for edge sections of the frame.