Continue reading “Product Highlight: 47X Series Handheld Test Instruments”
Advances in HVAC Test Equipment: The Importance of Diffuser Calibration for Flow Hood Measurements
Introduction
Objective
The objective for this writing is to inform HVAC technicians and contractors about the limitations of testing equipment currently used for testing, adjusting, and balancing HVAC systems. The need for more accurate instruments is immediate as energy programs are moving toward net-zero energy building efficiencies.
In doing so, HVAC technicians and contractors will struggle with tighter specifications as they tune HVAC systems with instruments that fail to provide the required accuracy and versatility. Continue reading “Advances in HVAC Test Equipment: The Importance of Diffuser Calibration for Flow Hood Measurements”
Custom Scales for Differential Pressure Gages
A common flow measuring application is using a Magnehelic® Differential Pressure Gage with a Pitot Tube to measure velocity pressure. This velocity pressure can then be easily converted into velocity or flow rate. Continue reading “Custom Scales for Differential Pressure Gages”
Air Balancing HVAC Systems
Methods of Air Balancing
Air balancing a distribution system is needed to properly direct the air flow in order to optimize the system’s design. Flow rates are tested, adjusted, and 
balanced as cubic feet per minute (CFM) or cubic meters per hour (m3/h). There are two traditional methods for balancing airflow at the terminals. The first is sequential balancing, which involves setting the zone and branch dampers in sequence. However, the most common method of air balancing is called proportional balancing.
The Dwyer Approach to Monitoring Relative Humidity in Stagnant Air
