LX-140 WITH 14,000 BTU AC AND 14,200 BTU HEATER. Yes I know its pricey at $419.89 but when you think what even a portable air-con is going to cost you, this all in one heater / air conditioner / fan and dehumidifier will cover all year round climate control for your grow room. One thing that really makes it stand out is its big capacity dehumidifier (60 pints).
The person should pass out in 6 - 20 seconds. Depending on the person, irreversable brain damage will begin somewhere around 4 to 6 minutes. At 7 minutes, the brain will be dead but the drowning person missed it all as they passed out at 6 - 20 seconds.
A child doesn't have to be visibly struggling in the water for this to happen. All it takes is some unexpected water in his or her mouth or a playful dunk. Unlike the relatively quick timeline of dry drowning, secondary drowning can occur up to 24 hours after a child leaves the water and involves water in the lungs. When a small amount of water gets into a swimmer's lungs, it can cause inflammation that makes breathing difficult.