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1. Air King

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Air King E-22A 7-Inch Round Collar with Back Draft Damper

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Air King #ad - Use with qz2 and dS Series hoods for vertical round ducting. 7-inch diameter and fits 7-inch round ducting. Prevents outside air from penetrating the home. Features an aluminum construction. Comes with a 1-year limited warranty.
BrandAir King #ad
ManufacturerAir King #ad
Height6 Inches
Length18 Inches
Weight0.45 Pounds
Width36 Inches
Part NumberE-22A
ModelE-22A
Warranty1 Year parts only

2. ALDES

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7 Inch Round Spring Loaded Backdraft Damper by American ALDES

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ALDES #ad - Minimal pressure to open. May be installed in any position or orientation to prevent backflow and designed for use in AC, Heating, Vent and other HVAC application temperatures from -22 to 180 degrees F Fahrenheit. Highest rated Premium Airflow Control Backdraft Dampers. Available in 4", 7", 10", 5", 8", 6", 12", 14" and 16". Spring-loaded butterfly aluminum damper blades encased in a 20-guage galvanized steel housing. 004 to 008 in. Extremely easy and secure inline duct insertion installation. W. G. Maximum automatic back flow protection.
BrandALDES #ad
ManufacturerAmerican Aldes #ad
Height6.75 Inches
Length2.5 Inches
Weight0.56 Pounds
Width6.75 Inches
Part Number99 035

3. Speedi-Products

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Speedi-Products AC-BD 07 7-Inch Diameter Galvanized Back Draft Prevention Damper

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Speedi-Products #ad - Consult your local building codes for approved installation practices. Ideal for use with intake or exhaust duct systems. Seal joints with approved duct mastic sealants. Insulate ductwork for improved energy efficiency and comfort.
BrandSpeedi-Products #ad
ManufacturerApplied Applications International #ad
Height8 Inches
Length7 Inches
Width7 Inches
Part NumberAC-BD 07
ModelAC-BD 07
Warranty1 Year

4. Tamarack Technologies, Inc.

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Tamarack TTi-CBD7 Cape Backdraft Damper 7"

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Tamarack Technologies, Inc. #ad - 7" silent backdraft damper, inexpensive, made in the USA, In Line Damper, easy installation into existing ducts.
BrandTamarack Technologies, Inc. #ad
ManufacturerTamarack Technologies, Inc. #ad
Weight2 Pounds
Part NumberTTi-CBD
ModelTTi-CBD

5. Continental Fan

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N/A, Continental Fan Manufacturing BDD175 Gravity Operated Backdraft Damper for 7" Du

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Continental Fan #ad - Low air leakage design. Install in horizontal or vertical upblast only position. Gravity operated closure. Galvanized steel housing, aluminum butterfly damper blades. Ideal for supply or exhaust applications.
BrandContinental Fan #ad
ManufacturerContinental Fan #ad
Height0 Inches
Length0 Inches
Weight2 Pounds
Width0 Inches
Part NumberBDD175
ModelBDD175

6. Broan

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Broan 026715201778

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Broan #ad - Includes sound dampening foam for quiet operation. 7" round vertical discharge damper. For use with Broan or NuTone brand range hoods.
BrandBroan #ad
ManufacturerBroan #ad
Height1.24 Inches
Length3.64 Inches
Width2.92 Inches
Part NumberBP87Q
Model026715201778

7. Broan

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7-Inch, Broan BP87 Vertical Discharge Damper

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Broan #ad - Helps keep your range hood operating at peak performance. Sturdy to use. Made from the highest quality materials. 7-inch vertical discharge damper.
BrandBroan #ad
ManufacturerBroan-NuTone #ad
Height0.53 Inches
Length0.83 Inches
Weight0.3 Pounds
Width0.72 Inches
Part NumberBP87
ModelBP87