Hi Iain
As Nemesis correctly stated above, there is plenty space at the rear to let the air out...and if you check the above picture again, you will see that it is actually designed to draw air into the car through the front grilles and exit some of it out across the top of the bonnet...out of those bonnet vents...that is the idea behind the design of those vents...to promote cooling airflow through the car but at the same time allowing some of it to escape too thereby keeping the engine cool.
As for a good mini drill..... B & Q do a good one for £15 including 60 piece accessory kit...made by Performance tools, It's the same size as the Dremel, even looks like one and of course Dremel bits can be used with it. It does have variable power speeds on it too....The same thing made by Dremel will set you back £70...!!!
I've had mine for 2 years now and it is a superb tool and of good build quality
You can also get it with a stand and flexi attachment (like the sort of thing a dentist uses) so you don't have to hold the whole drill when doing finer work....these sell at about £25 to £29 (that does include the drill...!!) I am ordering a stand and flexi attachment for mine.
I also still have my como mini-drill as distributed by MFA years ago, that is not as powerful but useful for finer work.
Performance tools appear to be made for B&Q so don't think you will find them anywhere else.
Regards..........Mark.
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