I have a open large shed that we keep our tractors under. Cold, rainy days are the perfect time to service and repair whatever needs mending and this outdoor heater makes it much more comfortable. My farm shed is only a tin roof with no sides so no worry of lack of oxygen here. The heater puts out lots of heat and can be easily moved, when cool, to wherever its needed. The only problem I have found with it is whenever we have farm help around, they are usually drawn to it like a magnet, always pretending to be tired and cold. The quality of the patio heater is surprisingly good. The heat reflector is not as large as others I have seen, but it sends down plenty of heat. The whole thing looks nice and was easy to assemble, took the farm hand about 30 minutes. I like it a lot.