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150 VAV-PRC011M-EN

Application Considerations

Insulation

Matte-Faced

This type of insulation is used for typical applications. It consists of a fiberglass core covered by

a high-density skin. The dual-density construction provides good sound attenuation and thermal

performance.

Foil-Faced

This type of insulation is used in applications where there is some concern regarding airborne

contaminants entering the space, or dirt being trapped in the fibers of the insulation. The insulation

is composed of a fiberglass core laminated to a foil sheet. Foil-faced insulation will provide the

same sound attenuation performance as matte-faced insulation.

Double-Wall

This type of insulation is used in applications where there is extreme concern regarding airborne

contaminants entering the space or dirt being trapped in the fibers of the insulation. The insulation

is the same as the matte-faced insulation. However, after the insulation is installed, a second solid

wall of 26-gage steel covers the insulation. All wire penetrations of this insulation are covered by

a grommet. This type of insulation will result in higher discharge and radiated sound power.

Closed-Cell

This type of insulation is used in applications where IAQ and fibers are of primary concern. The

acoustics of the closed-cell insulation are similar to double-wall insulation. The thermal properties

are similar to fiberglass insulation. This insulation contains no fiberglass.

Acoustics

Acoustical Best Practices

Acoustics with terminal units is sometimes more confusing than it needs to be. As we know, lower

velocities within a unit leads to improved acoustical performance. Additionally, if the VAV terminal

unit has a fan, a lower RPM provides better Acoustical performance. It is as simple as that—there

are some catches, however.

Additional considerations will be discussed in more detail throughout this portion of Application

Considerations, such as unit size and type, appurtenance affects (due to insulation, attenuation,

etc.), certification, and computer modeling. Let’s take a look at the first consideration, sizing of

units.

Sizing of Units

Before blindly increasing the size of units, we must first understand what is setting the acoustics

within the space. In general, over 95% of acoustics in VAV terminal units, which set the sound

Encapsulated edges

Insulation in a VAV terminal unit is used to avoid condensation

on the outside of the unit, to reduce the heat transfer from the

cold primary air entering the unit, and to reduce the unit noise.

The VariTrane line offers four types of unit insulation. The type

of facing classifies the types of insulation. To enhance IAQ

effectiveness, edges of all insulation types have metal

encapsulated edges.

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