1). All-uPVC multi-chamber design and multiple weather-stripping deliver amazing energy performance.
2). The most internal chambers: Outstanding insulation, noise reduction, thermal efficiency, and strength.
3). Mounting hardware installs through at least 2 uPVC walls for secure, time-tested placement.
4). Kinds of hardwares are valid: Stainless Steel Friction Hinges; Single Point Handles or Extrior handles&Drive Rod or Operator.
5). Milk White color is valid.
6). Can be made with OEM.