Model # 90RB12X4X5

Internet # 100171168

Store SKU # 908240

Store SO SKU # 755578

12 in. x 4 in. to 5 in. 90-Degree Register Box

$7.81 /each

Frequently Bought Together

Product Overview

The Master Flow 12 in. x 4 in. to 5 in. 90-Degree Register Box is constructed from galvanized steel to help ensure a long-lasting performance. It creates a 90-degree transition from a round pipe or insulated flexible duct to an air register or grill. It is suitable for most HVAC applications and can be installed easily with sheet metal screws (sold separately).

  • Galvanized steel construction for durability
  • Use to provide a 90-degree transition from round pipe or insulated flexible duct to air register or grill
  • Install with sheet metal screws (not included)
  • Fits most HVAC types for universal application
  • Seal seams with code-approved mastic, sealant or duct tape (sold separately)

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 


Brand/Model Compatibility 
HVAC application 
All HVAC types 
Product Weight (lb.) 
1.64 lb 

Warranty / Certifications

Manufacturer Warranty 
Free from Manufacturer Defect at Time of Delivery. 

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Customer Questions & Answers

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Customer Reviews

Rated 5.0 out of 5 by 1 reviewer.
Rated 5.0 out of 5.0 by Great Solution This is the way to install a new vent in the floor. We removed a wall vent while installing a new slider, and the duct below was connected to this register box for simple fast renovation. Measure twice, order, and cut once! Thanks Home Depot. June 17, 2014
  • 2016-07-22 T15:34:14.781-05:00
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