Top 10 Best air duct sealant in 2026

Last Updated - 6/30/2026

🏆Best Choice

ETERART

ETERART Aluminum Foil Duct Tape Heavy Duty,High Temperature Sealing and Patching,Perfect for HVAC,Air Ducts,Metal Repair,Foamboard,Insulation,Dryer Vent and More,2 Inches x 20 Yards,Silver

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•TRONG HOLDING POWER:Eterart Aluminum foil tape adopts advanced manufacturing technology and is added with strong adhesive, which can be fixed quickly. Added with adhesive with high tensile strength and shear stress resistance, it boasts its adhesion level of industrial strength and makes you free from worry about its track adhesion
•EASY TO INSTALL:Aluminum tape heavy duty is easy to paste and applicable to most surfaces. You can directly tear it by your hands and don't need to use scissors. You can take our tape with you for any project or maintenance and ensure that your things are in order
•RESIDUE-FREE AND SURFACE-SAFE:The adhesive of the latest technology foil tape adopts makes it strongly adhesive and easy to remove. You can directly remove it by your hands and it won't leave any residue, meaning that you won't see any adhesive residue on the surface and don't need to worry that it may stain the surface of your object when you replace
•WHERE TO USE: Aluminum foil tape is widely applicable. It can be widely used for High Temperature Sealing and Patching,for HVAC,Air Ducts,Metal Repair,Ductwork,Foamboard, Insulation,Dryer Vent,DYI and More,indoor and outdoor.Our tape is multi-purpose and very suitable for the need of temporary maintenance and routine maintenance, so it's a must-have in your toolkit
•PERFECTION IN SERVICE:Unless your tear it off, we are quite confident in the strong power of our duct tape in use. It's multi-purpose and suitable for the need of any family.If you are not satisfied，you can contact us through Amazon, our customer support team is always ready, 24/7 to guide you in whatever assistance you would be needing

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$7.69

$9.99

-23%

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Rectorseal

Rectorseal 81880 1-Pound Duct Seal Compound Gray

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•APPLICATION: Rectorseal duct seal compound is a gray, soft, non-toxic, putty-type compound that adheres to most clean dry surfaces; Duct Seal can be hand-molded to any form and reused if necessary
•EASY TO USE: The putty like duct sealant compound is easy to use and can be hand applied from 25°f to 120°f; can be applied to electrical conduit ends and boxes, flashings, and service mast entries
•SUPERIOR FORMULA: Duct seal creates an air and water tight seal; resistant to water, alcohol, and mild acids and bases; duct seal compound is asbestos-free; it will not damage plastic materials, corrode metals, or have adverse effect on human skin
•SPECIFICATIONS: Duct seal compound; grey in color and putty like; non-corrosive and non-irritant; can be hand-shaped to any form and reused if necessary, has many applications in hvac/r, plumbing, metal fabrication, and a superb general purpose sealant around the home; may be painted immediately after applying and won't bleed through dry paint film
•FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets

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$5.09

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3M Aluminum Foil Tape 3340, 2.5" x 50 yd, 4.0 mil, Silver, HVAC, Sealing and Patching Hot and Cold Air Ducts, Fiberglass Duct Board, Insulation, Metal Repair

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•VAPOR SEAL TAPE: 2.0 mil aluminum foil backing (4.0 mil total thickness) with a strong, pressure sensitive acrylic adhesive is ideal as a vapor seal tape for duct closure.
•HOT AND COLD TEMPERATURES: Combination of a foil backing and acrylic adhesive gives this tape a superb operational temperature range of -40F-300F (-40C-149C).
•EASY RELEASING LINER: Poly coated kraft paper liner protects the adhesive and keeps the tape ready for use.
•LONG LASTING: The foil backing serves as an excellent barrier against moisture, dust and many chemicals - making it strong, durable and long-lasting.
•APPLICATIONS: Heating Ventilation Air Conditioning (HVAC), duct closure, vapor seal on reinforced fiberglass duct board, rigid fiber glass duct board, flexible air ducts and air connectors.
•Listed for both UL181A-P and UL181B-FX

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$38.70

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Red Devil

Red Devil 089650 Extreme Temperature HVAC/R Silicone Sealant, Long-Lasting Weather-Resistant Adhesive, 280 ml, Aluminum, 1-Pack

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•SPECIFICALLY DESIGNED FOR HVAC / R APPLICATIONS: Weather resistant temperature range of -60 degrees Fahrenheit to 400 degrees Fahrenheit make this Extreme Temperature Sealant ideal for HVAC/R uses
•EXCELLENT ADHESION TO MANY SURFACES: Adheres to Metal, Aluminum, Concrete, Glass, Fiberglass, Vinyl, and Plastic and offers long-lasting flexibility and durability with a weather-resistant seal
•WILL NOT CRACK, SHRINK OR PEEL: With its Permanent Flexibility design, the multi-purpose sealant will withstand the elements and won’t crack, peel or shrink for a dependable seal that lasts for years
•FORM A WEATHER-RESISTANT SEAL: Depend on Red Devil’s Extreme Temperature Sealant for your HVAC/R; the sealant remains flexible with impressive adhesion and provides a weather-resistant seal that is heat and cold resistant when applied correctly
•FOR BEST RESULTS: Before applying the sealant, remove any old caulk, debris, or other residues that might interfere with adhesion and make sure the sealant is used on clean, dry surfaces for best results

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$16.17

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Red Devil

Red Devil 0841DX F-Seal 181 Duct Seal, Fiber Reinforced Water Based Duct Sealant, 1 Gallon, Gray, Made in USA

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•SUPERIOR SEALING: Fiber-reinforced formula ensures leak-free HVAC systems, improving energy efficiency and performance
•VERSATILE APPLICATION: UL 181 A-M & B-M certified for use on all types of HVAC ductwork, including metal, fiberglass, and flexible ducts
•INDOOR/OUTDOOR DURABILITY: Weather-resistant sealant withstands various conditions, making it ideal for both interior and exterior use
•FAST-DRYING & LOW VOC: Quick application and reduced drying time, with low volatile organic compounds for safer use in sensitive environments
•EXCEEDS INDUSTRY STANDARDS: Surpasses all SMACNA Pressure and Sealing Classes, ensuring top-quality performance for your HVAC systems

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$24.37

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Rectorseal

Rectorseal 81881 5-Pound Duct Seal Compound,grey

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•APPLICATION: Rectorseal duct seal compound is a gray, soft, non-toxic, putty-type compound that adheres to most clean dry surfaces; Duct Seal can be hand-molded to any form and resued if necessary
•EASY TO USE: The putty like duct sealant compound is easy to use and can be hand applied from 25â°f to 120â°f; can be applied to electrical conduit ends and boxes, flashings, and service mast entries
•SUPERIOR FORMULA: Duct seal creates an air and water tight seal; resistant to water, alcohol, and mild acids and bases; duct seal compound is asbestos-free; it will not damage plastic materials, corrode metals, or have adverse effect on human skin
•SPECIFICATIONS: Duct seal compound; grey in color and putty like; non-corrosive and non-irritant; can be hand-shaped to any form and reused if necessary, has many applications in hvac/r, plumbing, metal fabrication, and a superb general purpose sealant around the home; may be painted immediately after applying and won't bleed through dry paint film
•FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets

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$13.05

$21.14

-38%

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Gardner Bender

Gardner Bender DS-110N 1-Pound Duct Seal Compound

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Duct seal compound
•Seals conduit openings against drafts, dust, moisture and noise
•Protects terminal boxes, pot heads and bushings from corrosive elements
•Deadens switch gear panel noise
•Dough like compound is easily thumbed over holes and gaps

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$5.34

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Red Devil

Red Devil 0846DS RD-DS 181 Acrylic Latex Duct Sealant, 10.1 oz, Gray, 1 Pack

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•PERMANENTLY FLEXIBLE: Acrylic latex formula provides excellent elasticity and water resistance
•INTERIOR / EXTERIOR USE: Can be used either inside or outside the home
•STRONG ADHESIVE GRIP: Provides a tough bond on metal to metal connections
•NON FLAMMABLE: Safe to use in enclosed areas. Made in the USA
•DISCOLORATION RESISTANT: Cured sealant will not discolor over time

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$8.64

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Red Devil

Red Devil 0841DS RD-DS 181 Acrylic Latex Duct Sealant, 1/2 Gallon, Gray

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•PERMANENTLY FLEXIBLE: Acrylic latex formula provides excellent elasticity and water resistance
•INTERIOR / EXTERIOR USE: Can be used either inside or outside the home
•STRONG ADHESIVE GRIP: Provides a tough bond on metal to metal connections
•NON FLAMMABLE: Safe to use in enclosed areas. Made in the USA
•DISCOLORATION RESISTANT: Cured sealant will not discolor over time
•RD 181 Duct Sealant - Tub 1/2 Gallon
•Exceeds all pressure and sealing classes

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$26.14

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Hardcast

Hardcast Duct Seal 321 Duct Sealant #DS-321-4F

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

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$59.98

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