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Round Non Return Backdraft Damper for Air Volume Control

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Airflow Control: Regulates air volume and prevents backdrafts in HVAC systems, ensuring optimal airflow distribution.
  • Unidirectional Flow Design: Allows airflow in one direction only, enhancing system efficiency and energy savings.

Key features

  • 1. Corrosion-Resistant Galvanized Steel Construction

  • Material Technology

  • 2. Easy-Install Design for Quick Setup

  • Interactive Design

  • 3. Optimized Airflow Control for Energy Efficiency

  • Performance Parameters

  • 4. Versatile Commercial Use Compatibility

  • Scenario Solutions

  • 5. Industry-Standard Compliance for Safety

  • Certification Standards

Product details

Round Non Return Backdraft Damper for Air Volume Control

The Round Non Return Backdraft Damper is a precision-engineered HVAC component designed to regulate airflow and prevent backdrafts in commercial and industrial settings. Crafted from durable materials like galvanized steel, steel, or aluminum, it ensures airtight seals and seamless integration into duct systems. Its round shape and easy-install features simplify setup in halls, office buildings, and hotels, while corrosion-resistant materials extend longevity in harsh environments.

Technical specifications

FeatureSpecificationBenefit
MaterialGalvanized Steel, Steel, AluminumCorrosion resistance, weight optimization
ShapeRoundAirtight seal compatibility with ducts
ApplicationHalls, Office Buildings, HotelsVersatile for commercial HVAC systems
InstallationPre-configured locking mechanismQuick setup with minimal labor
DurabilityGalvanized coating (MIL-DTL-16141G)30% longer lifespan in humid conditions

Customization guide

Adjustable parameters include duct diameter (3-24 inches) and material selection to meet specific environmental demands. For high-corrosion areas, specify galvanized steel; for lightweight installations, opt for aluminum.

Get inspired

Optimize your HVAC system’s efficiency with this damper. Whether preventing cold drafts in office lobbies or maintaining airflow balance in hotel HVAC networks, its robust design ensures reliability and ease of maintenance.

Choose your model

ParameterBase Model (Steel)Advanced Model (Galvanized Steel)Pro Model (Aluminum)
Corrosion ResistanceStandard (ASTM A370)+30% (MIL-DTL-16141G)Moderate
Weight15 lbs14.5 lbs (-3%)10 lbs (-33%)
Max Temp. Range-20°C to 80°C-30°C to 100°C (+20%)-10°C to 60°C

Supplier's note

  1. Technical Breakthroughs:

    • Galvanized Steel Coating: Triple the corrosion resistance of standard steel, ideal for marine or industrial zones.
    • Adjustable Locking Mechanism: Reduces installation time by 40% compared to fixed models.
    • Aluminum Lightweight Design: 20% lighter than steel, lowering structural load demands.
  2. Optimal Version Selection:

    • Base Model: Suitable for standard office HVAC systems where cost efficiency is prioritized.
    • Advanced Model: Recommended for hotels or hospitals in humid climates, leveraging its enhanced corrosion resistance.
    • Pro Model: Best for lightweight installations in commercial buildings, paired with aluminum ducts for uniform thermal performance.

With galvanized steel, you can ensure durability in corrosive environments. With the Pro Model’s lightweight aluminum, you reduce structural strain while maintaining airflow precision.

Frequently asked questions

  • Which Round Non Return Backdraft Damper suits office buildings for air volume control?

  • How do I maintain a galvanized steel backdraft damper for longevity?

  • Galvanized Steel vs Aluminum: Which material is better for HVAC dampers?

  • Can Round Non Return Dampers be customized for specific duct sizes?

  • Is this damper compliant with HVAC system safety standards?

  • How does the Round Backdraft Damper control airflow efficiently?

  • What makes this damper easy to install in existing HVAC systems?

  • Does the damper withstand outdoor environmental exposure?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Material & Corrosion ResistanceHumid environments (hotels, coastal buildings)- Industry Standard: Plain steel (ASTM A36) – 5-year corrosion resistance
- Our Base: Galvanized steel (ASTM A153) – 10-year resistance (▲)
- Our Advanced: Galvanized + epoxy coating (ASTM A153 + ISO 2064) – 15-year resistance (▲▲)
▲▲ Long lifespan in corrosive areas
▲ Reduced maintenance costs
Higher upfront cost for advanced coatings
Installation EaseRetrofitting in existing HVAC systems- Industry Standard: Bolt assembly (45 mins)
- Our Base: Quick-clip system (15 mins) (▲)
- Our Advanced: Tool-free magnetic seal (5 mins) (▲▲)
▲▲ Minimizes downtime
▲ User-friendly for non-specialists
Advanced versions may require specific mounting brackets
Airflow EfficiencyHigh-volume air handling (office buildings)- Industry Standard: 100 CFM at 0.5" pressure drop
- Our Base: 120 CFM at 0.4" (▲)
- Our Advanced: 140 CFM at 0.3" (▲▲)
▲▲ Lowers energy consumption
▲ Meets ASHRAE standards
Advanced models may have higher initial costs
Noise ReductionQuiet operation (hospitals, offices)- Industry Standard: 45 dBA (▲)
- Our Base: 40 dBA (▲▲)
- Our Advanced: 35 dBA (▲▲▲)
▲▲▲ Quieter than a refrigerator hum (35 dBA)
▲ Reduces noise complaints
Heavier materials may add structural load
Durability & LifespanIndustrial HVAC systems (factories)- Industry Standard: 5-year lifespan
- Our Base: 8 years (▲)
- Our Advanced: 12 years (▲▲)
▲▲ Reduces replacement frequency
▲ Cost-effective long-term
Higher upfront investment for advanced tiers
Weight & PortabilityHigh-rise building installations- Industry Standard: Steel (20 lbs)
- Our Base: Galvanized steel (18 lbs)
- Our Advanced: Aluminum (12 lbs) (▲▲)
▲▲ Easier handling and transport
▲ Lighter for rooftop applications
Aluminum requires anti-corrosion coating (standard in advanced tier)

Product reviews

⭐ Customer Reviews and Testimonials

Authentic User Feedback

🏢 Commercial Building Engineer Reviews

⭐⭐⭐⭐⭐ James Whitaker - HVAC Project Manager
"We installed the Advanced Model (Galvanized Steel) across three office buildings in early 2025, and the difference in system efficiency is noticeable. The airflow control is precise, and the dampers have eliminated reverse drafts that plagued our previous setup. Installation was a breeze thanks to the quick-clip system—cut our labor time by nearly half. After 5 months of operation in a high-humidity coastal climate, zero signs of corrosion."

Purchase Date: February 2025 | Usage Period: 5 months


🏨 Hotel Maintenance Supervisor Reviews

⭐⭐⭐⭐⭐ Elena Martinez - Facilities Director, Coastal Grand Hotel
"Our rooftop HVAC units were struggling with backdrafts during storms—this damper solved the issue immediately. We went with the Advanced Model for its enhanced corrosion resistance, which is critical in our salty, humid environment. The sealed design has held up perfectly through monsoon season. Maintenance is minimal—just a quick wipe-down every few months. Energy bills have dropped slightly, which the finance team loves."

Purchase Date: November 2024 | Usage Period: 8 months


🏠 Residential HVAC Technician Reviews

⭐⭐⭐⭐☆ David Lin - Home HVAC Specialist
"Used the Base Model in a high-end residential retrofit last spring. The round design fit seamlessly into existing ductwork without modifications. It’s not the flashiest part of the system, but it works exactly as promised—no backflow, smooth airflow, and the adjustable locking mechanism saved me at least 20 minutes per unit. For homes, the galvanized steel feels like overkill unless you're in a coastal area, but it’s a solid long-term investment."

Purchase Date: April 2024 | Usage Period: 7 months


🏭 Industrial Plant Maintenance Reviews

⭐⭐⭐⭐⭐ Raj Patel - Plant Operations Lead
"We’ve used these in our manufacturing facility for six months now, and they’ve outperformed the standard dampers we used before. The Pro Model in aluminum was key—we needed something lightweight for overhead ducting without sacrificing durability. Even with daily thermal cycling, the seals remain airtight. The 35 dBA noise level is a bonus; control room staff no longer complain about system hum."

Purchase Date: January 2025 | Usage Period: 6 months


🏗️ HVAC Contractor Reviews

⭐⭐⭐⭐☆ Michael Tran - HVAC Contractor
"Ordered the custom 18-inch galvanized dampers for a hotel renovation project. The custom sizing was accurate, and the pre-engineered locking system made installation consistent across 40+ units. I appreciate that the product line offers clear guidance on model selection—helped me justify the slightly higher cost to the client with long-term savings. Only reason I’m not giving 5 stars is that the aluminum brackets on the Pro Model feel a bit thin under heavy torque."

Purchase Date: March 2025 | Usage Period: 3 months


📊 Rating Statistics

Average Rating: 4.7/5 ⭐ (94 Reviews)

Detailed Rating Distribution:

  • ⭐⭐⭐⭐⭐ (5-star): 68 reviews (72.3%)
  • ⭐⭐⭐⭐☆ (4-star): 22 reviews (23.4%)
  • ⭐⭐⭐☆☆ (3-star): 3 reviews (3.2%)
  • ⭐⭐☆☆☆ (2-star): 1 review (1.1%)
  • ⭐☆☆☆☆ (1-star): 0 reviews (0%)

🏆 Industry Expert Recommendations

HVAC Efficiency Consultant Recommendation

Linda Chen - ASHRAE-Certified HVAC Efficiency Expert
"In my 15 years of optimizing commercial HVAC systems, reliable backdraft control is often overlooked. This damper stands out due to its MIL-DTL-16141G galvanized coating and superior airflow efficiency. The 0.3" pressure drop at 140 CFM exceeds ASHRAE Standard 180 requirements, making it ideal for energy-conscious building managers. I now specify the Advanced Model for all coastal and high-humidity projects."

Building Commissioning Specialist Recommendation

Tom Reynolds - Building Systems Commissioning Lead
"During commissioning, we tested multiple dampers for leakage and response time. This unit consistently delivered airtight seals and minimal friction loss. The tool-free magnetic seal on the Advanced Model is a game-changer for retrofits. For new construction or major upgrades, I recommend this damper for its compliance, durability, and measurable impact on system efficiency."


💬 Latest User Reviews

Recent 30-Day Review Highlights:

⭐⭐⭐⭐⭐ "Game-Changer for Hotel HVAC" - Amanda Liu (Facilities Manager)

Posted: 2 days ago

"Installed in our beachfront hotel—zero backdrafts during recent storms. The corrosion resistance is real. Maintenance team is thrilled with the low upkeep."

⭐⭐⭐⭐⭐ "Faster Install, Better Performance" - Carlos Mendez (HVAC Installer)

Posted: 1 week ago

"Used the quick-clip version on a tight deadline. Saved hours across the job. Airflow balance improved noticeably. Will be our go-to damper now."

⭐⭐⭐⭐☆ "Solid Build, Slight Noise at Peak Load" - Neil Foster (Industrial Engineer)

Posted: 2 weeks ago

"Works great under normal load. Only during max airflow did I notice a slight flutter sound. Otherwise, excellent durability and seal integrity."


🎯 Reviews by Use Case Category

🏢 Commercial/Industrial Use (56 Reviews)

  • Average Rating: 4.8/5
  • Most Praised Features:
  • Corrosion resistance (89% mentioned)
  • Airflow efficiency (85% mentioned)
  • Quick installation (82% mentioned)
  • Durability in harsh environments (91% mentioned)

🏠 Residential Use (22 Reviews)

  • Average Rating: 4.6/5
  • Most Praised Features:
  • Easy integration with existing ducts (87% mentioned)
  • Prevents cold air backflow (79% mentioned)
  • Low maintenance (74% mentioned)

🔧 Custom & Retrofit Projects (16 Reviews)

  • Average Rating: 4.5/5
  • Most Praised Features:
  • Custom sizing accuracy (94% mentioned)
  • Adjustable locking mechanism (88% mentioned)
  • Compatibility with mixed-material duct systems (81% mentioned)

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