Register Box with Expandable Foam Insulation to Reduce Air Leakage
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Solution Overview
Problem
Existing HVAC register boxes face issues with air leakage, labor-intensive manufacturing processes, and the tedious application of fibrous insulation, which are costly and hazardous to workers, while also being inflexible to accommodate different duct sizes and air movement systems.
Innovation Solution
A register box with a body formed from a single sheet of metallic material, featuring inwardly extending flanges and an expandable polymeric material, such as polyurethane, that is applied and shaped within the box to create a tight seal and insulation, allowing for easy adaptation to various duct sizes without the need for fibrous insulation or complex tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional sheet metal register boxes with multiple pieces and fastening methods are used, then structural strength is improved, but air leakage occurs through gaps and seams
Solution Approach 1:
The patent merges multiple separate sheet metal pieces into a single integral formed box structure. The register box is created by forming a single sheet of gauge metal into a box shape with integrated corners and sides, eliminating the need for separate pieces and fastening methods. This integration removes gaps and seams where air leakage occurs, while maintaining structural strength through the continuous metal structure.
2Quantity of substance
If fibrous insulation material is manually applied to register boxes, then insulation coverage is improved, but worker safety deteriorates due to hazardous exposure
Solution Approach 1:
The patent replaces hazardous fibrous insulation material with a self-insulating foam material that is applied in liquid form and then expands to fill the register box cavity. This foam material is non-hazardous, does not require manual handling of fibrous materials, and provides complete insulation coverage. The foam is applied as a liquid slurry that expands to fill all spaces, eliminating worker exposure to harmful fibrous materials while achieving complete insulation coverage.
3Quantity of substance
If traditional insulation application methods are used, then insulation effectiveness is improved, but manufacturing time and costs increase
Solution Approach 1:
The patent incorporates insulation capability directly into the register box manufacturing process itself. The foam insulation material is applied within the formed box structure during fabrication, and the material self-expands to fill the cavity automatically. This eliminates separate insulation application steps, reduces manufacturing time, and provides complete insulation coverage without requiring additional labor or specialized equipment.
4Ease of manufacture
If standard register box designs are used, then manufacturing simplicity is improved, but adaptability to different duct sizes deteriorates
Solution Approach 1:
The patent uses the expandable foam insulation material to provide adaptability to different duct sizes and configurations. The foam is applied as a liquid slurry that expands to fill the register box cavity and can be cut or shaped to accommodate various duct openings. This allows the same basic register box structure to be adapted to different duct sizes and air movement systems without changing the box itself, maintaining manufacturing simplicity while providing versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution minimizes air loss, improves insulation efficiency, reduces manufacturing time and costs, enhances worker safety, and allows for easy adaptation to different ductwork configurations, ensuring compliance with national building codes and energy efficiency standards.
Implementation Method 1
An expandable polymeric material, such as polyurethane, that is applied and shaped within the box to create a tight seal
Data Source
AI summary
A register box for an HVAC installation has a body with a plurality of side panels arranged in a generally rectangular or square configuration and a plurality of flanges extending inwardly from the plurality of side panels, an expandable polymeric material affixed to an inner side of each of the plurality of side panels such that the expandable polymeric material has a portion extending across one end of the body inwardly of the plurality of flanges, and a sheet positioned over the portion of the expandable polymeric material at the one end of the body such that the sheet is interposed between the plurality of flanges and the portion of the expandable polymeric material. The expandable polymeric material and the sheet are cuttable so as to open to the interior of the register box.