ASHRAE Journal - December 2020 - 79

Nailor Stealth Series Fan Powered Terminal Units
Building engineers, owners, and occupants can rest easy knowing their Nailor Fan
Powered Terminal Units provide the best combination of sound, control, and comfort.
For over 20 years Nailor has led the industry with the most innovative solutions for
VAV systems. The Stealth Design has now been validated as the benchmark and
industry is rushing to imitate the design. #flattered
Fan Powered System Selection

Series Fan Powered Terminal Unit Advanced Control Sequence

Airflow

When designing a VAV system there are two choices
for the fan powered terminal units that condition the
exterior of the building; Series and Parallel.

Max
Heating
Induced Air
Max
Cooling
Induced Air

Nailor 35S Series FPTU
Primary Air

A recent study highlighted in the ASHRAE Journal
showed that compared to a PSC motor baseline,
choosing a variable speed controlled ECM series fan
powered terminal unit can reduce a building HVAC
energy usage by up to 10%. This makes series units
the clear choice.
Series Terminal units have a fan located in the air
stream that is powered when the HVAC system is
operational. This reduces the size of the large air
handling unit fan because the series fan handles the
static pressure downstream of the terminal unit. With
variable speed control the fan operates at part load for
most of its operation, reducing the energy use of the
entire HVAC system.

Room Temperature

Nailor Stealth technology is a first of its kind integrated
silencer that provides up to a 20% reduction in the
radiated NC sound produced by the unit.
Hydronic coils, optional on all Nailor Terminal Units,
come fully encased in an insulated enclosure. This
greatly increases the thermal efficiency of the coil
conditioning the air.
Finally, space frame construction of the Nailor Series
Terminal Units enables easy access for service
personnel if needed. Even the attenuator on the Stealth
model is an access panel.

Nailor Series Fan Powered Terminal Units
Since 1996, Nailor has recognized the importance of
series technology and has invested in delivering the
most efficient solution to the market. Nailor utilizes
an opposed blade damper (OBD) for optimal control.
When compared to the industry standard butterfly
damper, the OBD provides superior control, lower
pressure drop, and lower noise.
The Nailor portfolio was the first to utilize ECM
technology which enables variable speed control.
EPIC Fan Technology¨ from Nailor allows the pressure
independent control sequence above. This significantly
increases efficiency of the entire HVAC system, while
increasing comfort for the occupant.

Visit nailor.com for more information.

Nailor 35SST

Nailor, The Validated Choice
Every aspect of the design has accounted for facilities
management, energy efficiency, occupant thermal and
acoustical comfort, and system operation to provide the
most advanced terminal unit solution.
http://www.nailor.com
ASHRAE Journal - December 2020

Table of Contents for the Digital Edition of ASHRAE Journal - December 2020
