Measuring Static Pressure in Tunnel-Ventilated Houses

In a tunnel-ventilated house static pressure is primarily an indicator of how hard the fans are having to work to pull air into and down the house. The higher the pressure the harder the fans have to work. As the level of work/static pressure increases, the amount of air moved by a fan decreases and power usage increases. For instance, increasing static pressure from 0.05" to 0.20" will tend to decrease the amount of air moved by a tunnel fan between 20 and 30%, while at the same time increasing... power usage of the fan by between 8 and 16%.