Universal Termination Vent Screen Assembly for Airflow and Drainage
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Solution Overview
Problem
Current conduit screen assemblies restrict airflow, fail to drain condensation, are not removable, and are limited to specific piping materials, failing to meet UV resistance requirements and compatibility with different piping standards.
Innovation Solution
A universal termination vent screen assembly with a snap-on escutcheon wall plate, featuring a transition fitting that connects to various piping materials, includes a removable screen portion, and allows for condensation drainage, ensuring high airflow and UV resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a tight screen mesh is used in conduit screen assemblies, then rodents and debris are effectively blocked from entering the ventilation pipe, but airflow is detrimentally restricted
Solution Approach 1:
The screen assembly is divided into multiple functional components: a hub fitting for installation, a screen portion with optimized mesh geometry, and a drainage system. This segmentation allows each component to be optimized independently - the screen mesh can be designed with larger openings for airflow while maintaining blocking capability through strategic placement and angular orientation of screen elements.
Solution Approach 2:
A drainage channel system acts as an intermediary element between the screen mesh and the ventilation pipe interior. This intermediary structure allows air to pass through the screen while directing condensation and water away from the screen mesh, preventing ice buildup that would otherwise block airflow. The drainage system mediates between the conflicting requirements of screen density and airflow continuity.
2Object-affected harmful factors
If conventional conduit screen assemblies are installed, then screen coverage is provided, but the assemblies lack the ability to drain water causing built-up water to freeze at colder temperatures
Solution Approach 1:
The drainage channels are pre-formed as integral parts of the hub fitting and screen assembly structure during manufacturing. These channels are positioned to intercept condensation and water before it can accumulate on the screen mesh or inside the ventilation pipe. By providing drainage pathways in advance, the system prevents the formation of ice blocks that would compromise reliability in cold temperatures.
Solution Approach 2:
The screen mesh is designed with a flexible or semi-flexible structure that can accommodate thermal expansion and contraction without cracking or blocking drainage channels. The thin film nature of the screen allows condensation to pass through to the drainage channels while still blocking debris, maintaining both protective function and drainage capability across temperature variations.
3Adaptability or versatility
If current screen assemblies are designed to fit into PVC or PP qualified hub fittings, then compatibility with specific piping materials is achieved, but the assemblies are not removable for replacement, cleaning, or interchangeability
Solution Approach 1:
The connection between the screen assembly and hub fitting is designed to be dynamically adjustable rather than permanently fixed. The assembly can be inserted into and removed from various types of hub fittings (PVC, PP, gasketed, or glued) without permanent attachment. This dynamic connection allows the screen to be easily removed for cleaning, replacement, or interchangeability while maintaining compatibility with different piping materials through the universal hub fitting interface.
4Strength
If metal screens are used for combustion ventilation pipes, then structural strength is provided, but the screens rust out quickly due to moisture in the exhaust vent line
Solution Approach 1:
The screen assembly uses composite material construction, combining a polypropylene or PVC hub fitting structure with a metal screen mesh that is protected from direct exposure to moisture. The non-metallic hub fitting provides the primary structural strength and corrosion resistance, while the metal screen mesh (when used) is positioned and protected to provide screening function without direct contact with corrosive condensation. This composite approach maintains structural integrity while eliminating rust issues.
Data Source
AI summary
A termination vent screen assembly that selectively secures to different interfaces of a ventilation pipe system, regardless of their manufacturer. The termination vent screen assembly provides a free-open-area configuration that enables sufficient airflow and condensation moisture drainage. The assembly has a vent portion that nests in a universal fitting. The vent portion provide distal leg flanges to operatively associate with hubs or, when the leg flanges are folded onto themselves, operatively associate with pipes having smaller diameters than their hubs.