How to cut circular hole in breeze block?

[fars]

Hi,
I've got to cut a 160mm round hole thru a breeze block wall to fit an exhaust fan. It's not a structural wall.

I've got a small cold chisel, plus a masonry drill, should I just go for it?

Is there any chance of cracking the block or anything I should be careful with?

Thanks,
far

 

[Diyisfun]

You could go & hire a hole saw.
It will break easy with hammer & chisel
how neat does it need to look or will all be hidden

 

[fars]

The fan housing is square and will cover a messy hole.

Would it be possible to use the masonry drill to drill a bunch of holes in a circle and then maybe try to score between them and then knock the middle bit out? Or do the blocks crack easily enough that I should avoid trying this sort of approach and just go hire the right tools?

 

[Diyisfun]

I think for 1 hole that will not be visibile, you may as well drill & chiesl, just nibble bits away.

 

[fars]

Great! Thanks for that.

 

[foxhole]

Thermolite block? you can cut with an old wood saw.