1 000 cubic feet per minute airflow adjustable thermostat colors. Calculating the number of linear feet of cobra exhaust vent needed for a 30 x 40 attic. The first step is to check out this 60 second video and learn about the 300 1 rule the difference between intake and exhaust ventilation and why proper ventilation is so important to get right to help calculate your attic ventilation needs visit gaf ventilation calculator.
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