Whether you’re new to torchwork or optimizing an existing studio, proper ventilation isn’t just a comfort issue—it’s critical to your health and safety. In a field where fumes, heat, and combustion byproducts are common, understanding how to design an effective ventilation system is non-negotiable.

For years, Mike Aurelius’ Ventilation Primer has been recognized as a go-to reference in the art glass community—a foundational resource for anyone working with torch-based processes. This long-standing series, authored by a respected expert in lampworking safety, offers clear, actionable guidance on everything from airflow calculations to effective studio layout. Below, we highlight some of the core concepts—but for the complete technical deep dive, we encourage readers to consult the original Ventilation Primer.

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Why Ventilation Matters

In torch-based work, harmful gases like nitrogen dioxide (NO₂) can build up quickly. Without effective airflow, these substances linger in your breathing zone, posing serious long-term health risks. A well-designed ventilation system removes fumes at the source and replaces them with clean air—protecting both you and your studio environment.

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The Core Concepts

Mike Aurelius’s primer introduces several vital engineering principles, adapted for practical studio use:

1. Airflow and Velocity

To move toxic fumes efficiently, you need to create directional airflow at a specific speed—typically measured in feet per minute (FPM) and cubic feet per minute (CFM). Aurelius provides clear formulas:

• CFM = Hood Area × Velocity × Efficiency Factor
• Velocity Pressure (VP) = (Velocity ÷ 4004)²

Understanding these values helps ensure your system has enough pull to capture the full fume plume from your torch.

2. Sizing Your Ducting and Fan

Duct diameter, length, and bends all affect resistance in your system. The primer offers step-by-step guidance for calculating static pressure losses—critical for choosing a properly rated fan that won’t underperform once installed.

3. The Trouble with Overhead Hoods

Many glassworkers use standard box-style hoods mounted overhead—but Aurelius explains why this setup often fails. Most suction happens directly at the duct opening, so if your hood is too large or the duct is too far from the source, fumes escape into the room. Alternatives like rear-wall or bench-level capture are more efficient for torchwork.

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Environmental Adjustments

Operating at high altitude or in extreme temperatures? You’ll need to account for changes in air density. The series shows how to modify calculations for realistic pressure and airflow conditions, which can dramatically affect your system’s performance.

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Other Smart Design Tips

• Make-up Air: Always ensure your ventilation system is pulling in fresh air to replace what’s being exhausted—especially if you work in a tightly sealed space.
• Noise Management: Aurelius discusses techniques to reduce fan noise without sacrificing effectiveness, including fan placement and vibration isolation.
• Cold Weather Strategies: In frigid climates, options like under-bench ducting help reduce drafts and keep workspaces comfortable.

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Final Thoughts

Setting up effective ventilation doesn’t require an engineering degree, but it does demand some careful planning. This guide provides the foundation—calculations, design considerations, and troubleshooting—but the best results come from tailoring your setup to your specific space and work style.

For full technical details, calculations, and diagrams, read Mike Aurelius’ complete Ventilation Primer. It’s one of the most comprehensive resources available for glassworkers and studio safety enthusiasts alike.