fixing angle bracket to plasterboard + aircrete Celcon

[WWilts]

Putting in a couple of these near ceiling to take boxing that will support a 4 inch extractor fan & ducting
Wall is Celcon aircrete (high strength) with plasterboard on dabs.

Q. What screws would do?

PS Tempted to try plasterboard foam adhesive for the bracket & the boxing, without any screws

 

 

 

[gravelrash]

brown Wall raw plugs and 60mm x 4mm screws. hand screw rather than ragging with power driver

[JohnMo]

You can specific airctete rawlplugs.  A very course screw in type.  I got mine from Screwfix.

 

They fix stuff well.  Screw in half a turn, the back a quarter turn, put them in slowly.  Work a treat.