Core Drill for Bathroom / Kitchen Fans

**WarrenG** · 02-11-2008

Any suggestions for a core drill to fit an extraction fan in a bathroom or kitchen??

I have been told that a diamond core drill is needed?

Any suggestions would be appreciated.

Warren

**Lew1s** · 02-11-2008

yeh a diamond bit, 4 inch iirc. havent done core drilling in a while so feel free to correct me on the size

**WarrenG** · 02-11-2008

Lew1s,

Yep any size indications would be appreciated.

Is there a standard size that you can buy for standard extractor fans?

**_ch_** · 02-11-2008

it all depends on the size of the fan you intend to fit,your probably better off hiring one and the drill for the day though,not very expensive

**clinger** · 02-11-2008

Bathroom fans tend to be 4" and kitchens can be up to 6" dependent on where they are sighted. Unless fitting them day in, I'd hire them from HSS and put it on the bill.

**WarrenG** · 02-11-2008

Thanks guys will check out HSS!

**beaver74** · 02-11-2008

if you want to drill a hole for a 4" you will want a 110mm core drill as core drills sizes are out side size and any pipe is sized 4"inside dimentions

mdshunk · 02-11-2008

Originally Posted by beaver74

if you want to drill a hole for a 4" you will want a 110mm core drill as core drills sizes are out side size and any pipe is sized 4"inside dimentions

If you have a choice, get a "thinwall" core bit (as opposed to thickwall) if you're just coring the hole in brick and block. Much less effort, quicker, and easier on the drill motor. I tend to core slightly bigger than 4" to accomodate screw heads, duct strapping, etc, that might also have to slide back in the hole as an assembly with the damper cap. If you drill a hole "exactly right", you'll end up cursing yourself. Most of the damper caps will cover up to a 5" hole.

Some of my friends have had decent luck with the grit-type hole saws in brick and block, but for just a few dollars more you can get a proper carbide toothed core bit. Difference between toys and tools.

**WarrenG** · 02-11-2008

Originally Posted by beaver74

if you want to drill a hole for a 4" you will want a 110mm core drill as core drills sizes are out side size and any pipe is sized 4"inside dimentions

Thanks Beaver!

**jeremy** · 04-11-2008

If you're looking for a tool hire co try Brandon tool Hire . I find HSS over priced. I have my own set as I often have to core cut for waste pipes and the like and if you were going to charge extra for hiring one why not buy one try screwfix etc and pass the equivalent hire cost on Getting the punter to pay for your tools is a rather good idea I think!