External venting on wall only accessible from inside

[rarara]

Hi,

I am looking to core a few holes for a couple of things - a cooker hood and a bathroom extractor. Only problem is that this will be 2nd floor, no access from outside etc

I am thinking the vent type with a downwards pointing cowl/backdraught shutter, but is there a magic trick to getting that in place? I suppose you could be inventive by threading rope through the hole and dropping it down outside, attach the vent then pull it up from the inside and try and negotiate it into the hole.

Any suggestions??

 

[foxhole]

My posting on this in another thread.
//www.diynot.com/forums/general-diy/fitting-an-extractor-cowl-from-the-inside.385518/#2959264

 

[rarara]

OK, seems like a winner! One further question though....

I am potentially drilling 3 cores (cooker hood, tumble dryer and bathroom). I have access to an SDS drill so presumably if it is up to the job (and has a clutch) I could use that. So, what would be most cost effective - buying a core drill bit or hiring one? Prices for both??

The wall type is sandstone externally, possibly brick or similar internally - probably getting close to 1m in total. I guess some form of extension would be needed? i already have a drill bit long enough for a pilot hole btw

 

[foxhole]

If it's a thick wall then hiring should be cheaper as with cost of extensions even a cheap core drill may be more expensive.