Hi, I'm a newbie on the forum and beginner gardener and need some sage advice on greenhouse improvement. I acquired a tiny 6x4 (wide X depth)greenhouse as a secondhand purchase from a neighbour and am wanting to improve ventilation by adding opening roof window and louvre. The only current opening window is a tiny triangular section in the eaves of the back wall and of course the sliding door. The trouble is, I have no idea of the make of the greenhouse frame. Looking at new greenhouses, it could be a Halls Popular, but at least a decade old. So, can anyone help with what kit I might use and where it might be bought? Thanks in anticipation!