Margin Airflow Door Structure for Room Pressure Relief
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Solution Overview
Problem
Hollow core doors and stile and rail doors lack effective solutions to prevent air pressure buildup in closed rooms, which interferes with the circulation of heated or cooled air in forced air systems, and they also contribute to indoor air quality issues due to the use of urea formaldehyde resin in their construction, leading to Sick Building Syndrome.
Innovation Solution
The integration of absorbent materials like diatomaceous earth and photocatalysts within the door structures to absorb and decompose formaldehyde and other noxious gases, combined with non-linear air flow pathways through the doors to prevent pressure buildup by ensuring air flow is equal to or greater than the inflow, thereby maintaining air circulation and improving indoor air quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hollow core doors use conventional materials like urea formaldehyde resin, then manufacturing cost is reduced and ease of manufacture is improved, but indoor air quality deteriorates due to formaldehyde emissions causing Sick Building Syndrome
Solution Approach 1:
The patent incorporates absorbent materials within the hollow core door structure to capture and neutralize formaldehyde emissions from the urea formaldehyde resin binder. This converts the harmful effect of using inexpensive resin-based materials into a beneficial air purification function, allowing the door to simultaneously provide structural integrity and improve indoor air quality by removing noxious gases.
Solution Approach 2:
The patent uses porous absorbent materials filled within the hollow core of the door. These porous materials provide large surface area for adsorbing formaldehyde and other volatile organic compounds emitted by the resin binder, transforming the door from a source of pollution into an active air purification system while maintaining manufacturing simplicity.
2Strength
If doors are designed as solid core structures, then strength and security are improved, but manufacturing cost increases and ease of manufacture deteriorates
Solution Approach 1:
The patent divides the door structure into a perimeter frame (stiles and rails) providing structural strength and a hollow core interior providing cost-effective filling space. This segmentation allows the strong frame to bear mechanical loads while the hollow core accommodates absorbent materials, achieving both strength and ease of manufacture through functional division.
Solution Approach 2:
The patent creates a composite door structure combining a rigid perimeter frame made of traditional door components with hollow core fill material. This composite construction provides the strength of solid wood framing while reducing overall material cost and simplifying manufacturing by allowing the core to be filled with inexpensive absorbent materials rather than requiring solid wood throughout.
3Productivity
If air flow openings are added to door margins, then air circulation is improved and pressure buildup is prevented, but privacy and sound insulation deteriorate
Solution Approach 1:
The patent addresses the privacy concern by directing air flow through the hollow core interior of the door rather than through openings in the visible face panels. This dimensional redirection of the air flow path allows margin openings to exist for pressure equalization while maintaining visual privacy, as the airflow occurs within the hidden hollow core space rather than through visible gaps in the door surface.
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 effectively reduces air pressure buildup and improves indoor air quality by ensuring non-linear air flow through the doors, which helps in removing noxious materials and maintaining air circulation, thus addressing both pressure and Sick Building Syndrome issues.
Implementation Method 1
The present invention includes absorbent material which absorbs and decomposes formaldehyde gases and other noxious materials and removes them from within the hollow core door and from air passing through the hollow core of a door
Implementation Method 2
The present invention includes absorbent material which absorbs and decomposes formaldehyde gases and other noxious materials
Implementation Method 3
doors having stile and rail frames and center panel elements and through which margin portions air flows in a non-linear manner for preventing the build up of air pressure a closed room
Data Source
AI summary
Doors having stile and rail frames and center elements secured to the stile and rail frames and the center elements have margins inwardly where the center elements and the door frames overlap and openings extend through the margins outwardly from openings in skins, and inside and outside skins are secured to the stile and rail frames. The inside and outside skins have openings adjacent to and laterally or inwardly spaced apart from the openings through the margins whereby air flows through the openings in the inside skin, through the openings in the margins, and through the openings in the outside skin in a non-linear manner to prevent pressure build up in rooms to comply with the Department of Energy maximum recommended room pressure of three pascals or less.