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.
12 to 15 minutes - irreverseable brain damage intensifies and to heart as well. 15 to 20 minutes - brain damage reaches point to cease brain wave function - death. These times are estimates and can vary based on many factors however the total amount of time to death will not vary by much. Once the oxygen is depleted in the human system, biological death will occur in about 20 minutes. Hope this answers the question.