Wildfire smoke can infiltrate a building’s HVAC (Heating, Ventilation, and Air Conditioning) system through various pathways, including outdoor air intakes, cracks, gaps, and openings in the building envelope, and leaks in the ductwork. Once inside the HVAC system, the smoke particles can be distributed throughout the building, affecting indoor air quality and potentially causing health […]

19 Jun 2023

As a facility management professional it is essential to have a comprehensive understanding of different types of air handler units (AHU) used in commercial HVAC systems. This document aims to provide a comparative analysis of three commonly used air handler units: Chilled Water Air Handler Unit, Package Air Handler Unit, and DX (Direct Expansion) Air […]

The frequency of inspection and cleaning of commercial ductwork can vary depending on several factors, including the type of facility, the level of contamination, and local regulations. However, a general recommendation is to have commercial ductwork inspected every two to five years and cleaned as necessary. Commercial Ductwork Components The components of HVAC ductwork or […]

It is crucially important to understand the basic air handler unit anatomy of a chilled water HVAC system. This knowledge successfully steers the cleaning and maintenance for each section of the AHU. It also provides visibility to its respective impact on system performance, indoor air quality, and energy efficiency. ASHRAE Standard 62.1 Section 8 gives […]

Simply put, delta-T refers to the temperature difference between the chilled water entering the air handler unit (AHU) evaporator or chilled water coil and the leaving refrigerant or water. It is a crucial factor in determining the performance and energy efficiency of not only the AHU, but the HVAC system as a whole. Here’s how […]

22 May 2023

Tax Initiative 179D, also known as the Energy Efficient Commercial Buildings Deduction, is a federal tax incentive program in the United States that encourages energy efficiency improvements in commercial buildings. It provides a deduction for the costs associated with implementing energy-efficient HVAC (heating, ventilation, and air conditioning) systems, lighting systems, and building envelope improvements. History […]

16 May 2023

The Centers for Disease Control and Prevention (CDC) provides funding through the Epidemiology and Laboratory Capacity for Prevention and Control of Emerging Infectious Diseases (ELC) program. This funding supports state and local health departments in their efforts to respond to public health emergencies, including the COVID-19 pandemic. Specifically, this allows public schools to provide CDC […]

How HVAC affects air pressure in buildings is determined by a few factors. It’s especially important to consider the impacts of both balanced and degraded HVAC systems. The HVAC system is designed to keep a building comfortable by regulating the temperature, humidity, and air quality inside. One important aspect of HVAC systems is air pressure. […]

Building pressurization is the difference in air pressure between the inside and outside of a building. There are three types of pressure that we typically talk about: positive pressure, negative pressure, or stack pressure, and each has an affect on indoor air quality. Positive pressure occurs when there is more air coming into the building […]