Starting with the development of the first zoning dampers and registers in the 1950s to today, with exclusive Plug & Play dampers  Zonefirst has led the way in excellence and continued innovation.
ZONEFIRST is the first company that successfully developed and marketed HVAC Zoning Systems back in the 1950s and is today a leading manufacturer of HVAC zone dampers and zoning systems. Several other major zoning companies are in business due to ZONEFIRST.
It was in the mid to late 1950s when Richard Foster developed the first automatic motorized dampers, registers and difusers that were thermostatically controlled. He marketed these products under the trade name Zone-A-Trol with another company when in 1964 he founded Trolex Corporation and the start of the well known trade name Trol-A-Temp. In 1999 the Trol-A-Temp brand was acquired by Honeywell.
Since that time, Trolex has continued to manufacture zone dampers for a number of OEMs. In 2004 Trolex re-entered the HVAC market as ZONE-A-TROL and later the ZONEFIRST tradename. This new name signifies the many firsts the company has developed in the HVAC industry. We were the first company to develop automatic dampers, registers, and diffusers for zoning, centralized zone controllers, the first zoning system to feature normally open dampers and the first to zone heat pumps in the early 1970s

ZDS1408

ZDS1408

ZD20X10TZ Honeywell Home Square Parallel Blade 24 VAC

Honeywell ZD20X10TZ

The ZD is a power close and spring open damper. It has a 24-volt motor used to control circulating air in HVAC systems and used when a normally-open damper is required. The ZD is typically used with the TrueZONE and other electronic zoning systems.

• Mechanical visual position indicator for damper status
• Solid construction using extruded aluminum frame and blades
• Parallel blade design for low leakage performance
• Simple, easy-to wire, two wire installation with a third wire option M4 for LED open only light
• Reliable, strong, 24 volt spring return motor
• Fail-safe, normally open operation
• Ordering instructions: order ZD (dimensions 1) x (dimensions 2), (motor is always mounted on dimensions 2 side) for example, ZD10x8 is a 10 x 8 Inch damper with the motor on the 8 Inch side, but a ZD8x10 is an 8 x 10 Inch damper that has the motor on the 10 Inch side
• Damper can be installed in any orientation (mounting side can be on either the bottom or the side of the duct)
• Motor or actuators mounting - side or top
• 30 sec power closed/10 sec spring return
• 90 deg angular rotation
  

  Honeywell ZD20X10TZ

ZD8X18TZ Honeywell Home Square Parallel Blade 24 VAC

Honeywell ZD8X18TZ

The ZD is a power close and spring open damper. It has a 24-volt motor used to control circulating air in HVAC systems and used when a normally-open damper is required. The ZD is typically used with the TrueZONE and other electronic zoning systems.

• Mechanical visual position indicator for damper status
• Solid construction using extruded aluminum frame and blades
• Parallel blade design for low leakage performance
• Simple, easy-to wire, two wire installation with a third wire option M4 for LED open only light
• Reliable, strong, 24 volt spring return motor
• Fail-safe, normally open operation
• Ordering instructions: order ZD (dimensions 1) x (dimensions 2), (motor is always mounted on dimensions 2 side) for example, ZD10x8 is a 10 x 8 Inch damper with the motor on the 8 Inch side, but a ZD8x10 is an 8 x 10 Inch damper that has the motor on the 10 Inch side
• Damper can be installed in any orientation (mounting side can be on either the bottom or the side of the duct)
• Motor or actuators mounting - side or top
• 30 sec power closed/10 sec spring return
• 90 deg angular rotation
  

  Honeywell ZD8X18TZ

Honeywell Home ZD8X24TZ Zone Damper Bottom Mount 8" x 24" Power Close & Spring Open 24 VAC

ZD8X24TZ

ZD8X24TZ

Thermo Manufacturing 16050 Ultra Fire Resistant Thermo Pan, 16 x 47-1/2"

Thermo Manufacturing 16050

Thermo Manufacturing 16050

EWC Controls 6URD Zone Damper Round 6" 24 VAC

6URD

6URD

Aprilaire Zoned Comfort Control is designed for residential new construction and provides the components needed forsimple, reliable and profitable installs.

• Zone damper normally open; powers closed, allowing conditioned air to continue to flow if mechanical motor reaches end of service life.
  
  • Motor covered for improved appearance
    
    • Simplifies installationfewer wires to organize
      
      • Gasket material minimizes air bypass when blade is closed
        
        • All openings secured, preventing spray-in insulation from entering actuator
          
          • Simple, labor-saving design
            
            • Thumbscrew adjustable, no tools required
              
              • Simple, visual system check and troubleshooting,
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                6725AA

                
                

                6725AA

At AprilAire, our mission has always been to make homes healthy through intuitive design and professional-grade solutionsbecause healthy homes are the foundation for healthy people, families, and communities.

Healthy Living Everyone deserves to breathe Healthy Airno matter where you live or what your circumstances are

Simplicity by Design

Our Healthy Air solutions are designed to be intuitive, easy to use, and environmentally friendly.

Making a Difference

Our work is fueled by a passion for making a Healthy Air difference.

Real

We're committed to delivering real results through dedication to our customers and solutions that perform.

6724AA

6724AA

At AprilAire, our mission has always been to make homes healthy through intuitive design and professional-grade solutionsbecause healthy homes are the foundation for healthy people, families, and communities.

Healthy Living Everyone deserves to breathe Healthy Airno matter where you live or what your circumstances are

Simplicity by Design

Our Healthy Air solutions are designed to be intuitive, easy to use, and environmentally friendly.

Making a Difference

Our work is fueled by a passion for making a Healthy Air difference.

Real

We're committed to delivering real results through dedication to our customers and solutions that perform.

6815AA

6815AA

At AprilAire, our mission has always been to make homes healthy through intuitive design and professional-grade solutionsbecause healthy homes are the foundation for healthy people, families, and communities.

Healthy Living Everyone deserves to breathe Healthy Airno matter where you live or what your circumstances are

Simplicity by Design

Our Healthy Air solutions are designed to be intuitive, easy to use, and environmentally friendly.

Making a Difference

Our work is fueled by a passion for making a Healthy Air difference.

Real

We're committed to delivering real results through dedication to our customers and solutions that perform.

6817

6817

Aprilaire 6814 Zone Damper 8" x 14" Bottom Mount,
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6814

6814