rough opening guide dunbarton corporation rough openings timely industries rough opening guide dunbarton corporation ark design 48 in x 80 in 5 lites frosted gl mdf closet sliding door with hardware kit white rough opening guide dunbarton corporation johnson hardware 2222 sliding byp bi fold door with chrome trim p344 rough openings timely industries sizing a rough opening for bifold doors doors mering rough openings bifold doors door size chart nominal johnson hardware 2222 sliding byp