The Science of Comfort

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Acoustical Enclosure in Downtown Calgary

Posted by Mauricio Salinas on April 29, 2025 at 9:00 AM

Bringing Design to Reality

Back in 2022, a mixed-use building in the Downtown East Village neighborhood of Calgary, AB, managed by the Calgary Housing Corporation, was identified as violating the city’s noise bylaws due to excessive noise emitted by its air-conditioning condensers. To address the issue, the city had initially planned to purchase and relocate new low-noise variable refrigerant flow (VRF) condensers.

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Topics: Acoustics, Noise Control, Acoustic Louvers, Acoustic Panels, Engineering, Design Engineering

Mitigating the Risks of Close-Coupled Silencers

Posted by Mauricio Salinas on April 15, 2025 at 9:00 AM

System Testing to Optimize Terminal Unit Acoustics

In many commercial HVAC systems, engineers pair VAV boxes, fan-powered boxes and fan coils with duct silencers to meet the acoustical requirements of a space. While all the components are tested to industry standards – AHRI 880 and AHRI 260 for terminal units and fan coils and ASTM E477-20 for silencers – the combination of these two categories in real-world installations isn’t always straightforward.

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Topics: Noise Control, HVAC Silencers, Pressure Drop, Velocity Profile, Terminals, HVAC, Engineering, Design Engineering

How Do Fan Coil Units Work?

Posted by Braydon Whittington on April 2, 2025 at 9:00 AM

The Energy-Efficient Workhorse of Your HVAC System

Fan coil units, or FCUs, are a quiet but crucial part of many HVAC systems, helping to maintain comfortable temperatures in buildings of all sizes.

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Topics: Fan Coils, Controls, Thermal Comfort, HVAC Fundamentals, HVAC, Engineering, Design Engineering, Filtration

Space Requirements for Fan Coil Installations

Posted by Mark Mahon on March 25, 2025 at 9:00 AM

Best Practices for a Successful Mechanical System Design

Understanding how much space a fan coil unit needs is imperative for mechanical system design. Incorrect assumptions can create deviations between contract documents and finished buildings, which can lead to change orders and increased project costs for building owners. The type of fan coil unit, the options it is configured with and the overall design of the building’s HVAC system all influence the final installation requirements.

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Topics: Fan Coils, HVAC Fundamentals, HVAC, Engineering, Design Engineering

What Is a Drop Box?

Posted by Ryan Compton on March 18, 2025 at 9:00 AM

A Simple Approach to Air Distribution for Large Spaces

In the world of air distribution, a drop box is a plenum with multiple air outlets that is connected directly to an air handling unit (AHU) by a short run of ductwork. A drop box can be an effective way to deliver a substantial volume of conditioned air to large, enclosed spaces.

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Topics: GRD, HVAC Fundamentals, HVAC, Engineering, Design Engineering

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