---
title: OOOOb Closed Vent System PE Certifications
description: '57 operating facilities certified under 40 CFR Part 60 Subpart OOOOb across Texas and New Mexico. Field audits, ProMax simulation, and PE-sealed reports delivered site-by-site on the regulatory deadline (April 2025 – June 2025).'
canonical: 'https://bellengr.com/projects/oooob-cvs-certifications/'
url: 'https://bellengr.com/projects/oooob-cvs-certifications.md'
post_id: 1166
post_type: projects
last_modified: '2026-07-16T18:24:52-05:00'
last_converted: '2026-07-17T16:50:36-05:00'
---

# OOOOb Closed Vent System PE Certifications