® will lessen the warmth transfer by as much as fifty%. Having said that, when there is direct summer months Solar striking the glass, then external shading is the right Option. ® is an appropriate procedure for timber framed glazing, doorways included. It could be placed on French doorways; https://secondaryglazinglondon57876.nizarblog.com/34807627/a-simple-key-for-secondary-glazing-windows-unveiled