Model # RAB20X25

Internet #203612937

Master Flow 20 in. x 25 in. Return Air Box with Filter Rail
0050206031513

Master Flow

20 in. x 25 in. Return Air Box with Filter Rail

$38.85 /each

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Product Overview

Take advantage of the durable 30-gauge zinc-coated, galvanized steel construction of this Master Flow 20 in. x 25 in. Return Air Box to equip your HVAC system with a long-lasting air return box. Its 20 in. x 25 in. opening acts as a convenient connection from return fittings to a ceiling or wall grill (not included) for return air needs. Cut your own opening and install a collar (not included)up to 20 in. diameter to attach pipe or flexible duct as needed.

  • Provides collecting port for central return duct
  • Traditionally used in a ceiling or wall application as an air return chamber, acting as a convenient connection for air return
  • Compatible with pipe or flexible duct up to 20 in. diameter
  • 30-gauge zinc-coated, galvanized steel construction provides durability

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Customer Questions & Answers

20 in. x 25 in. Return Air Box with Filter Rail
20 in. x 25 in. Return Air Box with Filter Rail

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1 answer

This is not designed for a 4" filter correct?

This question is from 20 in. x 25 in. Return Air Box with Filter Rail
Asked by
Largo Fl
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August 4, 2016
I am in the process of upgrading my system from a 1" to a 4" filter due to the cost of the filters. I ordered this part, RAB20X25 after looking at the expanded photo on the page. To my surprise their is a filter rail located 2" down from the opening, making it impossible to install the 4" filter.

The question: To use this for a 4" filter do I just remove the rails, and cut the back for the air flow? Or, do you make a RAB for a 20X25X4 filter?
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Answer (1)

August 26, 2016
Answer: 
Hello 20X25RAB! Thank you for your recent inquiry with The Home Depot. I believe it would be best to reach out to the manufacturer LL Building Products Inc. at 800-211-9612 for assistance. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.
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1 answer

Compatibility with return air filter grille

This question is from 20 in. x 25 in. Return Air Box with Filter Rail
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September 17, 2015
Hi, I need to make up a return air box/filter grille assembly. Is this return air box compatible with the filter grille listed below, which is also sold by Home Depot? I would assume so, since they are both listed as 20 x 25. Thanks in advance.

SPEEDI-GRILLE Model # SG-2520 FG
25 in. x 20 in. White Return Air Vent Filter Grille with Fixed Blades
Internet # 202542266
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Answer (1)

September 21, 2015
Answer: 
Thank you for contacting MasterFlow ... Yes, these items are compatible and should work together. Please call Technical Services Group at 800-211-9612, M-F 8A-5P EDT.
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