A: All of it is determined by the full square footage of hard surfaces inside a room. For the best possible efficiency, the encouraged minimum protection is twenty five to thirty% of all difficult surfaces.Then attach the remaining two Z-Clips towards the wall With all the screw holes oriented to the ground and make sure They're at the same stage a

These necessary tolerances amount of money to some gap in your window of between 5 & 6 inches in diameter. To put this into a digestible context, it is actually the same as leaving your lower sash open an inch all the time!We advocate the use of brush pile in excess of foam strips mainly because it is our 20 a long time practical experience that f