I think the tongue in cheek posts only made a whooshing noise as they flew over some peoples headsWhat?
Alot of people on here saying these heaters are going to kill you.
There is an exhaust for spent gases. This is be routed outside and sealed to Building fabric.
What's the problem then? Given the size of the space and exhaust gasses going outside I think you would be very unfortunate to DIE using one of these heaters correctly in a well Insulated and sealed garage.
A carbon monoxide alarm is also a must. But beyond that calm down everyone saying people are going to die FFS.