Contact europvc in pattaya. They fabricate, deliver and will send their team own team to install at an additional cost. I’m happy with my double glazing and the temp difference is amazing when you hand touch inside to outside. I installed all my exterior windows and doors. The PVC is guaranteed a little bit longer than just after the till payment.
Security locks are excellent. Slide and glide mechanism quiet.There are windows in UT but I found their quality IMHO inferior. There is a shop just south of the Nong Samrong road on the ring road who may have what you want, it’s call Austdoor. I used them in Vietnam when building but did not see them here until I bought my doors and windows.