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Home » Heating Services » What is a Small Duct High Velocity System (SDHV)?

─── The Unico System

What is a Small Duct High Velocity System (SDHV)?

Through ongoing research, standards writing, publishing, and continuing education, the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) organization has defined small duct high velocity (SDHV) systems. Those SDHVs deliver conditioned air through undersized ductwork and bendable supply tubes at a higher static pressure (i.e., velocity) than conventional forced-air equipment can do.

─── The Unico System

What is a Small Duct High Velocity System (SDHV)?

Through ongoing research, standards writing, publishing, and continuing education, the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) organization has defined small duct high velocity (SDHV) systems. Those SDHVs deliver conditioned air through undersized ductwork and bendable supply tubes at a higher static pressure (i.e., velocity) than conventional forced-air equipment can do.

What is the Best Application for a Unico System?

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The Unico System’s undersized ductwork structure is perfect for specific applications. For instance, retrofitting old homes built long before central heating and air conditioning got invented. Also, custom or log homes that need central air, but the system cannot alter the original structure’s design. That includes providing comfort for a room or wing addition using an indoor standalone option.

The Unico System operates like any other central air system but with incredible benefits. Homes or commercial buildings with no existing ductwork, the Unico System is capable of cooling or heating those structures too. Regardless of no ductwork, inadequate ductwork, or limited space for ducting. The Unico System easily adapts to any residential setting. That includes apartments, condominiums, or homes. It also applies to many commercial and industrial applications.

Benefits of a Unico Small Duct System

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Every type of HVAC heating and cooling system is specifically designed to fit a particular structural design. Unico’s small duct system is no different. However, it targets unique or retrofitting applications traditional appliances cannot address. Here are a few benefits:

Small Size 

Unico’s plenum is one-third the size of standard ductworks and uses flexible supply tubing instead. Also, the modular air handler fits in attics, basements, closets, and most small spaces.

More Flexible Installation

With little to no remodeling needed, a Unico system doesn’t require existing ductwork or duct modification. Its retrofitting design means less mess, dust, and install time.

Quiet Performance

Each component reduces sound, noise, and vibration from the nylon inner core to the sound-absorbing insulation. If you can’t hear it, you may forget your system is on.

Draft-Free / Even Temperatures 

Unlike traditional systems, the Unico System uses the aspiration suction principle. That provides draft-free cooling and even temperatures throughout the home.

Moisture Removal

Unico’s uniquely designed cooling coil is known for removing up to 30% more humidity than conventional systems. With that level of comfort, you can expect higher energy savings.

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─── Smylie One Blog

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