Afternoon. Could do with some advice on how to fit a metal hit and miss vent please. Its operation is opposite of the usual plastic types where the front plate slides across to close it. On these the front plate is secured to the wall and there's a slider which moves the rear plate back and forth.
Problem is that when I secure it to the wall I can't see how it'll move! I also have a fly screen mesh cut to fit which the fixing screws hold in place. The unit is 227mm square, rear plate is 200x175 and the hole is 210x 140 landscape once I knock some of the plaster clear.
What am I missing? Thanks for the advice in advance!