LZ Vinyl PVC windows single hung on China WDMAProduct Description PVC single hung window, or called Vinyl single hung window * vertically sliding up open * The opening panel stays wherever you left it. Ventilation amount is totaly up to you. * We have children protection design. Once you lock it up, kids cannot open the window * single glass 4mm thickness clear Opening Type: vertically sliding up Frame Material: PVC frames Glass Type: clear glass 4mm thickness Mosquito net: not included Frame