6" Round Ventilation Damper (Normally Closed/Power Open)
Product Highlights
6"
Round
24v
5 Year Warranty
Galvanized Steel
Description
Aprilaire round dampers come in all the sizes you need and work well with either rigid metal or flex duct. Adjustable blade positioning and an integrated foam seal provide flexibility for any type of zone job.
Specifications
- Power open/spring close operation
- Two Wire Installation
- 24Vac, 6W, 19Va
- 60Hz Synchronous Type Motor
- Impedance protected for continuous stall
- Adjustable stop (in open position)
Specs
| Product Type: |
Damper |
|---|---|
| Motor: |
Power Open Automatic |
| Type: |
Normally Closed |
| Application: |
Air Quality |
| Shape: |
Round |
| Size: |
6" |
| Voltage: |
24v |
| Material: |
Galvanized Steel |
| Warranty: |
5 Year |
Understanding "Normally Closed / Power Open" Dampers
How This Differs From the Honeywell TrueZone Damper
You may notice this AprilAire damper operates on the opposite logic from our Honeywell Round Automatic TrueZone Damper: the Honeywell model is power-closed/spring-open, while this AprilAire 6506 is normally closed / power open. In practice, that means:
- At rest (no power): the damper stays closed
- When powered: it opens to allow airflow into that zone
- If power is lost: the damper springs back to closed
This configuration is intentional and matched to specific zoning designs — the correct choice depends on your system's overall zoning strategy, not simply personal preference. Our technicians will determine which fail-safe behavior (normally open vs. normally closed) is appropriate for each zone in your specific installation.
Built for Flexibility Across Duct Types
Unlike dampers designed for a single duct material, this AprilAire model is engineered to install cleanly on both rigid metal ductwork and flexible duct, thanks to its adjustable blade positioning and integrated foam seal. That flexibility makes it a practical choice for:
- New construction with rigid metal trunk-and-branch duct systems
- Retrofit projects where flex duct runs are common, especially in tight attic or crawlspace installations
- Mixed-duct-type homes where different zones use different duct materials
Key Technical Advantages
- Two-wire installation — simplifies wiring back to the zone control panel compared to more complex multi-wire dampers
- 24VAC, 6W, 19VA power draw — low power consumption suitable for standard zoning transformer capacity
- 60Hz synchronous motor — provides consistent, reliable open/close timing
- Impedance-protected for continuous stall — the motor is designed to safely handle being held at a stop position without overheating or burning out, an important durability feature for dampers that may sit in a partially open state
- Adjustable stop in the open position — allows fine-tuning of maximum airflow into a zone, useful for balancing air distribution across a system
Sizing and System Compatibility
This 6" round damper is one size within AprilAire's broader damper lineup — the company offers matching dampers across the sizes needed for different duct runs throughout a home. Using dampers from the same product family (AprilAire) as your control panel — such as the AprilAire Single-Stage 3-Zone Control Panel — helps ensure electrical and control compatibility across your entire zoning system.
Why 5-Year Warranty Coverage Matters
Zone dampers operate constantly, opening and closing many times per day as your system responds to changing conditions in each zone. The 5-year warranty on this component reflects confidence in its motor durability and mechanical construction — important since a failed damper can affect comfort and airflow balance throughout an entire zone, not just at the damper itself.
Installation Considerations
Because this damper's fail-safe behavior (normally closed) differs from other zoning dampers, correct system design matters. Our licensed HVAC technicians will:
- Determine whether normally-closed or normally-open dampers are appropriate for each zone based on your overall system layout
- Confirm the damper is compatible with your existing rigid or flex ductwork
- Complete the two-wire connection back to your zone control panel
- Set and adjust the open-position stop to balance airflow with other zones
- Test the full system to confirm each damper responds correctly to its zone's thermostat calls
Frequently Asked Questions
Can I mix normally-open and normally-closed dampers in the same system?
Yes — in some zoning designs, different zones intentionally use different fail-safe behaviors depending on airflow requirements. This is a design decision best made by your HVAC technician.
Does this damper work with flex duct only, or rigid duct too?
Both — the adjustable blade and foam seal are specifically designed to accommodate either duct type.
What happens if a wire connection fails?
Because the damper is normally closed, a lost signal or power interruption will cause it to close — so a wiring fault typically results in reduced airflow to that zone rather than an uncontrolled open state.
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