Duck Brand, 2.25 Inch X 2.25 Inch X 42 Inch Window Air Conditioner Insulating Seal, Noise Reducing
Duck Brand, 2.25 Inch X 2.25 Inch X 42 Inch Window Air Conditioner Insulating Seal, Noise Reducing
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Duck Brand, 2.25 Inch X 2.25 Inch X 42 Inch Window Air Conditioner Insulating Seal, Noise Reducing

595 ratings
Duck Brand, 2.25 Inch X 2.25 Inch X 42 Inch Window Air Conditioner Insulating Seal, Noise ReducingDuck 2 25 x 2 25 x 42 Window Air Conditioner Insulating Seal Black2 pack Duck 2 25 x 2 25 x 42 Window Air Conditioner Insulating Seal Black
Pack SizeSingle

Key item features

  • Insulating Foam: This product is an insulating foam seal designed to create a barrier between window air conditioning units and the window frame.
  • Precise Dimensions: The seal measures 2.25 inches in width, 2.25 inches in height, and 42 inches in length, and is presented in a black finish.
  • Adhesive-Free: Featuring a non-adhesive design, this seal is simple to install and ideal for renters, leaseholders, and those in temporary living situations.
  • Climate Control: It effectively closes gaps around window A/C units, preventing outside air intrusion and maintaining indoor cool air for enhanced energy efficiency.
  • Environmental Barrier: Beyond temperature regulation, the seal reduces noise and vibration while blocking dust, insects, and pollen from entering the living space.
  • Item Details: Identified by model number 284423, this insulating seal has an item weight of 0.140 pounds and is manufactured by Duck Brand.
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Customer ratings & reviews

4.6 out of 5 stars
stars
595 ratings197 reviews
How item rating is calculated
  1. 5 stars79% (468)
  2. 4 stars12% (73)
  3. 3 stars4% (24)
  4. 2 stars2% (10)
  5. 1 star3% (20)

Reviews summary

Pros

  • : Provides cost-effective solution for sealing window air conditioner units.
  • : Fits snugly around various units and windows.
  • : The foam construction seals out drafts and provides a dense feel.
  • : Requires little time and effort to set up.
  • : The seal limits rattling and blocks outside air.

Neutral

  • : Its thick seal limits hot airflow but gaps still allow leakage.
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Showing 1-3 of 197 reviews

Jun 16, 2026
Reviewer name: judi
Top Reviewer
Item details
Multipack quantity: 1
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Great choice

For clarity, there is no tape nor is assembly required. I only gave 1 star for each since neither applies. In the past I have purchased another brand. I was pleasantly surprised to find this was wider than the other brand - which, allows for better weather proofing. Very durable, easy to use, cuts easily with regular scissors. Blocks a lot if hot air from entering.

Helpful?1ca95790-6892-11f1-8dd0-9d3763a63fd717133817
Feb 3, 2026
Reviewer name: LindaS
Top Reviewer
Item details
Multipack quantity: 1
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Good product

The foam around my a.c. Stopped the draft immediately and the cover worked great to protect my unit and seal the window from the cold weather in Northeast WI. I've never left my unit in the window and this product secured it well from winter's bite.

Helpful?1ca95790-6892-11f1-8dd0-9d3763a63fd717133817
Jun 12, 2026
Reviewer name: Tammy
Top Reviewer
Item details
Multipack quantity: 1
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

easy to install... just need a tape measure and scissors

Helpful?1ca95790-6892-11f1-8dd0-9d3763a63fd717133817
Current price is $4.23
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