Patent ID: 6116095
Filing Date: 2000-09-12
Classification: B60H,G01F

Abstract:
A device for predicting air flow from a duct system being produced by an environment conditioning plant, said device comprising:a housing having an inlet and an outlet;a restrictor movably connected to the housing for movement between a plurality of restricting positions wherein the restrictor restricts differing portions of the inlet;a blower disposed in the housing for moving air into the inlet and exhausting air from the housing through the outlet;a duct having an inlet portion and an outlet portion, said inlet portion being connected to the outlet of the housing for air flow communication therewith, and said outlet portion being adapted for air flow communication with an input opening of the duct system;a manometer connected to the duct and being operable to measure a static pressure value in the duct when the outlet portion of the duct is in air flow communication with the input opening of the duct system; andmeans for converting the measured static pressure value to an air flow value based on a performance curve of the environment conditioning plant; andwherein the restrictor is disposed in a selected one of the restricting positions, said selected one of the restricting positions produces an air flow that matches an output air flow of the environment conditioning plant.