Hole in wall from removal of extractor fan.

Whether the wall is a solid wall or cavity wall I would with the solid wall completely fill in the hole Ie block work internally and a similar brick or block on the external wall and finish as per the existing finishes around it If the wall is cavity again blockwork to the internal and brick or blockwork to the face side but before filling in make sure you put an insulating bat in the cavity area All finishes to be of the same material used on the inner and outer wall I don’t suggest you leave the external grate on as this will leave the hole open to the elements and may cause problems later on Hope this helps regards Gary Bright

Cavity Wall: Toothe out external brickwork to tie in new bricks bedded on mortar with added plasticiser Fill internal with 100mm cavity wall insulation cut out square on internal to block up opening then bond/set new blockwork Solid Wall: Toothe out external brickwork to tie in new bricks bedded on mortar with added plasticiser cut out square on internal to brick/block up opening render with added plasticiser skim over render

hi , very cheap solution , have a expanding foam less than £5 , spray it will expand thus sealing the air or anything from outside. later from out , have a knife cut the foam as you like deep enough to put matching bricks. from inside take 2cm away from the wall level then instead of skimming material , use thisle bonding material and plaster the area. sand it after three days and put mist coat of paint and then the paint you like on the whole wall. this one cheap option. the second option is you break the area where the cemented blocks and do proper brickes work and then plaster etc. hope this might help . Muhammad Arif Bedford