Abstract: A frame for supporting installation of an air measurement device over the opening of a duct or vent opening in the air circulation system of a building.

Abstract: A frame for supporting installation of an air measurement device over the opening of a duct or vent opening in the air circulation system of a building.

Abstract: A duct traversal preparation apparatus that temporarily adheres to a surface to enable hands-free traversal is provided. The apparatus includes scales to accurately locate the positions of traverse holes and a template with a locking device to guide the drilling of the traverse holes. The apparatus also orients a measuring probe to coordinates for accurate and repeatable airflow measurement.

Abstract: A measuring template for measuring both outside and inside diameters. The template includes a plate inscribed with a plurality of arcs with a common centerline and tangent. It also includes two pins attached perpendicularly to the plate such that their centerline intersects the centerline of the arcs at right angle.

Abstract: A multifunctional gauge with data and method for changing airflow volume. The gauge has a pair of adjustable opposing fingers for measuring the operating position of a variable pitch pulley and belt width and for verifying the use of a proper belt. The gauge consists of reference charts for use in determining the new operating position of the sheave to change the existing air volume produced by a fan driven by the pulley to a desired air volume.