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Nailor News is your source for content on relevant topics concerning Nailor Industries, Inc. and the HVAC industry. New product releases, case studies, product & project spotlights, employee interviews, trade publication articles, and general announcements are some of the content types you can expect to find in the Nailor Airwaves.

VAV System Design: What is your style?

April 26, 2021

By: Matthew Crump, PE

The Houston, Seattle, and Washington DC markets largely specify systems that utilize series fan-powered terminal units in all zones. Dallas and Portland, OR, specify parallel fan-powered units on the exterior with single duct units in the interior. The equipment and configuration of selected terminal units appear to be a matter of style. There are many reasons why different areas could have different design standards. Regardless, analyzing why you would select one style over the other could provide some value...

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AHRI Recognizes Nailor for 3 Years of Success

April 22, 2021

By: Matthew Crump, PE

The American Society of Heating Refrigeration and Air-Conditioning Engineers (ASHRAE) has developed standards that the industry uses to test their Terminal units (ASHRAE Standard 130) and Fan Coils (ASHRAE Standard 79).  These documents outline the standard procedure for testing each piece of equipment.  Standard 130 outlines terminal unit pressure drop and sound testing, while Standard 79 covers fan coil airflow and cooling/heating capacity testing.  Nailor performance data published in our selection...

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VAV Diffusers: The solution to some issues but the cause of others?

April 19, 2021

By: Matthew Crump, PE

Over-cooling in the summer or over-heating in the winter can impact occupant comfort. There are several solutions for this issue. These include rebalancing the system, adding Terminal Units for those spaces, or adding a VAV Diffuser. Nailor is currently in the process of adding a VAV diffuser to its portfolio. The use of a VAV Diffuser requires an understanding of the design, how they work, limitations, and system considerations associated with the product.

VAV Diffuser

The Nailor UNI VAV...

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VAV Equipment Selection: Fan Powered Terminal Units

April 6, 2021

By: Matthew Crump, PE

In many VAV systems, the exterior zones will utilize fan-powered terminal units. When compared to a single duct terminal unit, the fan-powered versions have a fan that enables the induction of plenum air into the airflow. During heating, the supplied conditioned air can be reduced to the minimum ventilation rate and the heating airflow is supplemented by induced plenum air. The introduction of the fan adds a few more variables to consider when selecting the equipment.

Parallel vs. Series

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VAV Equipment Selection: Single Duct Terminal Units

March 23, 2021

By: Matthew Crump, PE

Once the building cooling/heating load has been calculated and the VAV system has been laid out, the next step is for the engineer to select the exact sizes, models, and configurations of the terminal units that will deliver the comfort to the space. For both the single duct and fan powered terminal units, several variables must be considered including unit capacities, sound, type, heating requirements & type, and manufacturer.

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