Unable to determine correct size for B vent flashing and storm collar due to lack of published inner diameter specifications from manufacturers.

B vent manufacturers do not publish inner diameters for flashings and storm collars, making it impossible for users to verify fit before ordering.

Severity

3Medium

Willingness to Pay

implied

Added

Jul 3, 2026

Workarounds Described

measuring circumference and calculating diameter
ordering based on nominal size and hoping for fit

Implied Software Gaps

A database with actual inner diameters of B vent flashings and storm collars

App Concept

VentFit Pro

A web app that matches B vent parts by inputting actual vent circumference or nominal size. It cross-references manufacturer specs (including unpublished inner diameters from user uploads) to recommend the correct flashing and storm collar, reducing order errors and returns.

Key Features

Input vent circumference or nominal size to find compatible parts
Crowdsourced database of actual inner diameters from user measurements
Side-by-side comparison of multiple manufacturers' offerings
Direct links to purchase or local supplier lookup

Target Users: DIY homeowners and HVAC contractors replacing or installing B vent systems

Revenue Model: $4.99 per lookup or $19.99/year subscription

Existing Solutions Mentioned

Metal Fab

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