Should NFPA 496 be Abolished?
Please provide your opinion, and feel free to ask any qestions or make any comments.
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Top Mount Spark Arresting Enclosure Vents. Compatible with Model 101B and 103 Units.
| Weight | 3 lbs |
|---|---|
| Dimensions | 8 × 8 × 8 in |
Model PV-3 Top Mount Purge Vent
This Vent is a gravity operated enclosure pressure relieving device designed to prevent excess pressure inside a protected enclosure while preventing any sparks or burning material from escaping into a hazardous location. The Model PV-3 is designed for use exclusively with Best Purging Systems Models YZ101B and YZ103 purge and pressurization products. It features an aluminum cap, base and pipe fitting and stainless steel filter element and fasteners providing corrosion protection from harsh environments.
This Model PV-3 is designed to mount on the top of a protected enclosure, will begin to open when enclosure pressure exceeds approximately 0.8” w.c. and will fully open once enclosure pressure exceeds approximately 1.5”. This vent must be installed in a true vertical position and attaches to the protected enclosure with a standard 1-1/4” conduit hub or it can be remotely mounted.
For more information on this vent and all accessories, please contact a Best Purging Systems Sales Associate
or click the technical bulletin tab above to view this vent’s detailed specifications.

Model PV Purge Vent Assembly Technical Bulletin
This two page full color technical bulletin provides all essential information to make an informed purchasing decision. Beginning with a detailed product description, this bulletin also includes vent dimensions, technical specifications, a model number segment guide, complete material specifications and a purging and pressurization unit compatibility chart.
Click either link below to review high or low resolution versions. You may then print or save it and easily share this comprehensive technical bulletin with your colleagues!
High Resolution PDF | Low Resolution PDF
These documents will open in a separate window for your convenience.
Purging & Pressurization Accessories
Purging & Pressurization Accessories
Purging & Pressurization Accessories
Initiated 2/16/2026
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Please provide your opinion, and feel free to ask any qestions or make any comments.
Did you know members of our team have been conducting these fun, interactive and insightful seminars for over 30 years? Based on your current knowlege, we tailor our presentations to boost your knowledge and guide you through an open forum Q&A process of understanding essential NFPA 496 Code Requirements and how best to apply them.
To request one of these one or two hour seminars for yourself and others in your organization, please fill out and submit the registration form below...
DISCLAIMER:
Please note Best Purging Systems Corporation is not affiliated with nor accredited or certified by the National Fire Protection Association. Our guidance, recommendations and education regarding requirements of NFPA Code 496 are based upon over 80 years of combined experience as accumulated by our Senior Staff Members, as they've served both our many loyal clients and the NFPA as voluntary contributors and technical committee members,
Just like he did back in 1985, when he wrote America's first guide for enclosure purging and pressurization, our CEO and founder, Mike Baucom, recently wrote America’s first definitive ASHRAE Guide for HVAC in Hazardous Spaces. He undertook this effort on behalf of our sister company, Bebco Environmental Controls, with the extremely dedicated support of many fellow ASHRAE Technical Committee members. This ASHRAE Guide outlines numerous techniques and methods developed over time by countless experts within specific fields of interest.
To support ASHRAE and promote this new guide, we're offering a complementary copy on this website for a limited time. However, please note we anticipate a significant number of requests, so please act now!
In the meantime, give us a call with any questions about enclosure purging. We're standing by right now to help you understand critical NFPA 496 codes and the principles behind them, with absolutely no strings attached!
We know price matters, so we’ll match the price of any comparable unit, and our's will be better built, easier to install and more serviceable.
Call now for a quick quote!
We know quality matters, so we proudly offer America’s most comprehensive two year warranty.
See our Product Warranties link below, or contact us to learn more.
We’re committed to keeping you and your colleagues safe and fully advised on NFPA 496 and NEC safety requirements.
Please call us or click our chat box for expert advice anytime, regardless of whether you need our products.
We go to extraordinary lengths to manufacture the highest quality products and ship them quickly and securely to you.
As a result, you receive pristine units that work well from day one and continue to perfom over a very extended lifespan!
Unlike other companies that won’t accept any returns for any reason, if you buy something from us that’s not quite right, we’ll take it back or exchange it free of charge!
– At most, all you'll cover is the cost of shipping!
Give us a call and we’ll be happy to explain more about this unique benefit that’s designed to keep you happy and coming back to us for your purging and pressurization solutions.
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