WHAT DOES SASH WINDOW DRAUGHT PROOFING MEAN?

In contemporary sash windows, you happen to be more prone to locate a spring equilibrium (or sash balance) program. That is a spring-loaded gadget which counters the pressure of gravity, in result Keeping your sash window open up without the have to have for cords, pulleys and those metallic counterweights. Even though they will help keep heat ins