For each one-inch increase or decrease in the discharge hose diameter you get approximately a 33% increase or decrease in material volume that the hose can carry. As a general rule, use the smallest diameter conveying tube with the required capacity. Smaller discharge hoses are a more economical system. The larger the hose the less apt they will be to plug with larger more difficult particulates. Peterson blower trucks and trailers can accommodate 4-, 5-, or 6-inch hoses.