Short answer: Most lampworking torches do not use shop air at all. They run on fuel plus oxygen, and a Hot Head style torch needs neither. Across the makers we cover, an air compressor enters the picture in three cases (other manufacturers outside this catalog may differ): National premix torches (3A-B, 3B-B, 4B, 6B) that accept compressed air instead of oxygen with the correct air tips, GTT torches with the compressed-air injection option, where air supplements oxygen for temperature control, and Herbert Arnold Zenit burners, which take optional compressed air alongside oxygen for a cooler flame. If you do need one, size it by CFM delivered at your working pressure, not tank gallons, fit a moisture trap, strongly prefer an oil-free pump, and never plumb air through above-ground PVC pipe.
If you are still planning your overall bench, start with the lampworking torch setup guide. This article covers only the compressed-air corner of the hobby.
Do you actually need an air compressor?
Probably not. The overwhelming majority of bench torches in lampworking, from beginner burners to big multi-stage boro torches, mix fuel gas with oxygen from a concentrator or cylinder. An air-fuel flame (the kind a butane torch makes) does not do an oxygen flame’s work on glass, so shop air cannot substitute for oxygen on an oxygen torch. And at the entry level, a Hot Head runs on fuel alone with an air-aspirated head that draws in ambient air by itself, so it needs neither oxygen nor a compressor (see the Hot Head torch guide).
So if a compressor is on your shopping list, first confirm your torch is one of the genuinely air-capable designs below. If it is not, put the money toward oxygen supply and ventilation instead.
Where compressed air really fits: three torch scenarios
National premix torches with air tips: air instead of oxygen
The classic genuinely air-capable lampworking torches are the National premix family from Premier Industries. The National 3A hand torch operates on a variety of fuel gases (city gas, natural gas, mixed gas, propane, butane) with oxygen or compressed air, provided the proper tip type is selected for the gases used, and the screw-on tips cover a range of flame sizes. The same air-or-oxygen tip system runs through its siblings, the National 3B-B, National 4B, and the bench-mounted National 6B. Source: National Torch.
Why choose air on purpose? Community experience is that on compressed air these torches give a flame gentle enough for soda-lime work, where the same torch on oxygen can be more than soft glass wants. Air-fuel is a feature here, not a compromise: a National on shop air is a soft-glass and scientific-glass tool, not a boro melter.
GTT compressed-air injection: air on top of oxygen
Glass Torch Technologies holds patents on combining its Triple Mix and 4-Way Mix technology with compressed-air injection. GTT says that adjusting the fuel-to-compressed-air ratio tunes the flame temperature while the flame chemistry and flame type stay put, that each torch stage’s air injection is individually controllable, and that the injection can be run from a foot pedal. The critical point: on GTT torches, compressed air supplements an oxy-fuel flame for temperature control. It does not replace oxygen. GTT’s own model pages (read 2026-10-06) list a “with Compressed Air Option” version of the GTT Lynx, Cheetah, Phantom, Mirage, Delta Elite, Kobuki, Delta Mag, Ninja, Samurai, Cobra and Viper, each torch page’s version picker shows the air price, and the custom-built Quadzilla takes it as an option. The Bobcat, Cricket and Scorpion pages list no air version. For a deeper look at how the injection works, see GTT compressed air and 4-way mix. Sources: Glass Torch Technologies, compressed air option; GTT, Mirage with compressed air option (one of the model listings).
Herbert Arnold Zenit: surplus air for a cooler flame
Herbert Arnold’s Zenit surface-mix bench burners run on propane or natural gas and oxygen with optional compressed air. A flame-stabilization system lets them run with a surplus of air, which Herbert Arnold says gives a cooler flame. Again, air is a supplement to oxygen here, not a substitute. Arnold’s catalog gives the air side of the Herbert Arnold Zenit bench burner as 0.5 to 1 bar (about 7 to 15 psi), drawing at most 3.0 to 6.5 cubic meters an hour depending on head and fuel, roughly 1.8 to 3.8 CFM (our conversions); the hydrogen version and the Zenit hand torch list no air connection. Source: Herbert Arnold.
Sizing the compressor: CFM at pressure beats tank gallons
The most common compressor-buying mistake is shopping by tank size. For a torch, the tank is almost irrelevant. A compressor’s CFM rating is always tied to a specific pressure, typically stated at 90 psi, and CFM and PSI are inversely related: as delivery pressure rises, deliverable CFM drops. SCFM is airflow normalized to standard conditions (68 F, 14.7 psi, 36 percent relative humidity) so different models can be compared fairly, while ACFM is what the machine delivers under your real site conditions. Source: Quincy Compressor.
The receiver tank stores air and buffers demand between motor cycles, but it does not add delivery capability. A nail gun is a burst load, so a big tank papers over a small pump. A torch burns air continuously for as long as the flame is lit, so the pump’s CFM at your working pressure does all the work, and an undersized pump cannot be fixed with a bigger tank. Source: VMAC.
What does a glass torch actually demand? Of the three air-capable lines, only Herbert Arnold publishes an air figure (the Zenit numbers above); National and GTT give no air CFM on the pages we have read, so be suspicious of anyone quoting a precise number for those. The honest framing: a torch is a modest but continuous flow at low pressure, and you should verify the requirement with your torch’s maker before buying. Practical selection rules:
| What to compare | Why it matters for a torch |
|---|---|
| CFM at your working pressure | The only number that determines whether the flame stays fed |
| SCFM vs ACFM | SCFM compares models fairly; ACFM is what you get in your studio |
| Duty cycle | A continuous load means the pump cycles often; it must be rated for it |
| Tank gallons | Buffers cycling and smooths pulses only; never adds capacity |
Air quality: moisture traps, dryers, and why oil-free wins
Compressing air concentrates the humidity that was in the room into liquid water. That condensate travels downstream, where moisture in compressed air causes rust, degrades tools and equipment, and contaminates whatever the air feeds. The remedies, in ascending order of dryness and cost, are a water trap or separator with a drain, a refrigerated dryer, and a desiccant dryer for very dry air. Whatever you fit, drain the tank regularly so condensate does not sit inside corroding it. Source: Quincy Compressor.
For a torch feed, a water trap with a drain between the compressor and the regulator is the sensible baseline. You do not want slugs of water arriving at a burner’s air passages.
The oil question matters too. In an oil-free compressor, no oil enters the compression chamber; the gears and bearings are lubricated in a sealed, isolated circuit, which fully eliminates oil contact with the air path. Oil-injected compressors always pass some oil into the airstream. Carryover can be as low as roughly 3 ppm with air-oil separators, coalescing filters, and activated-carbon filtration, but filters reduce the contamination risk rather than eliminating it. Source: Atlas Copco.
For a home glass studio the call is easy: strongly prefer oil-free. It is not that a lubricated pump is disqualified, but oil-free removes the carryover question entirely, skips the filtration stack, and cuts maintenance. One non-negotiable either way: shop compressed air is never breathing air. Do not plumb a compressor into anything a person breathes from.
Noise in a home studio
A standard shop compressor cycling on and off in a small room is loud enough to be a genuine hearing consideration, stacked on top of ventilation fan noise you are already living with. Quiet home-studio-class machines exist: the California Air Tools 8010, a 1.0 HP oil-free dual-piston unit with an 8-gallon tank at 48 pounds, is rated at 60 decibels, achieved partly by a low 1680 RPM motor speed, with a pump rated for 3000-plus hours before wear; several sibling models carry the same 60 dB rating. Source: California Air Tools.
Treat manufacturer decibel claims as comparative rather than absolute, since they rarely state a standardized measurement distance. Placement helps as much as specs: put the compressor in an adjacent room or a ventilated closet if you can, and remember that a continuous torch load means it will cycle far more often than it would running a nailer.
Plumbing basics: compressor to torch
Keep the air side as disciplined as your fuel and oxygen sides:
- Regulate it. Run the compressor’s output through a regulator set to your torch maker’s specified air pressure, on a dedicated line. If a regulator hunts, creeps, or will not hold pressure, the diagnostics in regulator troubleshooting apply to air regulators as much as gas ones.
- Metal pipe or rated hose only, never above-ground PVC. OSHA’s 1988 Hazard Information Bulletin restricts PVC pipe for above-ground compressed-air distribution because PVC is not shatter-resistant and can explode into plastic projectiles under pressure; a documented injury prompted the bulletin, and thermoplastic air lines must be buried or encased in shatter-resistant material. Plumb studio air in metal pipe or proper rated air hose. Source: OSHA.
- Keep the three lines unmistakable. Air, fuel, and oxygen lines must stay physically and visually distinct, with no interchangeable fittings between them. A check valve on the air line keeps gases from migrating backward into the compressor side.
- Trap moisture upstream. Put the water separator ahead of the regulator so the torch sees dry, regulated air.
As always, the torch manufacturer’s manual takes precedence over anything here for pressures, fittings, and connection order. Do not guess at air pressures; National, GTT, and Herbert Arnold all specify how their air-capable torches should be fed.
Catalog torches that take compressed air
| Torch | How it uses air | Oxygen still required? |
|---|---|---|
| National 3A, 3B-B, 4B, 6B | Runs on compressed air instead of oxygen with air-specific tips | No, with air tips |
| GTT Lynx, Cheetah, Phantom, Mirage, Delta Elite, Kobuki, Delta Mag, Ninja, Samurai, Cobra, Viper (plus the custom Quadzilla) | Compressed-air injection option for per-stage flame temperature control | Yes |
| Herbert Arnold Zenit (propane and natural-gas versions) | Optional compressed air at 0.5 to 1 bar; surplus air cools the flame | Yes |
Every other torch in the catalog is an oxygen torch and belongs in the “you do not need a compressor” column.
Key takeaways
- Most lampwork torches run oxygen, not shop air, and a Hot Head needs neither. Confirm your torch is genuinely air-capable before buying a compressor.
- Only the National premix family runs on air instead of oxygen (with air tips, mainly for soft glass). On GTT and Herbert Arnold torches, compressed air is a temperature-control supplement on top of oxygen.
- Size by CFM at your working pressure, compared in SCFM. A torch is a continuous load, so tank gallons buffer but never add capacity.
- Fit a moisture trap with a drain, drain the tank regularly, and strongly prefer an oil-free pump. Shop air is never breathing air.
- Quiet 60 dB class oil-free compressors exist for home studios; treat decibel claims as comparative.
- Plumb air in metal pipe or rated hose, never above-ground PVC (an OSHA-documented shatter hazard), keep air, fuel, and oxygen lines distinct, and follow the torch manufacturer’s manual for pressures and connections.
Related guides
- GTT compressed air option and 4-way mix: how GTT’s air injection works and what it costs
- Best scientific glassblowing hand torch: where the National premix family fits
- Herbert Arnold Zenit concentric-ring burners: the Zenit heads and their air connection
- Regulator troubleshooting: air regulators fail the same ways gas ones do
- Natural gas conversion guide: why a compressor is never a fuel booster
- Hot Head torch guide: the torch that needs neither oxygen nor air
Sources
- Glass Torch Technologies, “Compressed Air Option”: https://www.glasstorchtech.com/compressed-air-option
- Glass Torch Technologies, “Mirage, with Compressed Air Option” (one of the model listings): https://www.glasstorchtech.com/product-page/mirage-with-compressed-air-option
- National Torch / Premier Industries, “Model 3A-B”: https://nationaltorch.com/?page_id=301
- Herbert Arnold, “Glassblowers” (Zenit burners): https://www.h-arnold.com/glassblowers
- Quincy Compressor, “What is Standard CFM?”: https://www.quincycompressor.com/resource/glossary/standard-cfm/
- Quincy Compressor, “Air Compressor Condensation and Moisture Guide”: https://www.quincycompressor.com/blog/air-compressor-condensation-moisture-guide/
- VMAC, “Sizing an Air Receiver Tank”: https://www.vmacair.com/blog/sizing-air-receiver-tank
- Atlas Copco, “Oil-free or lubricated compressor?”: https://www.atlascopco.com/en-us/compressors/wiki/compressed-air-articles/oil-free-or-lubricated-compressor/
- California Air Tools, “8010 Ultra Quiet Air Compressor”: https://californiaairtools.com/product/california-air-tools-8010-ultra-quiet-1-0-hp-oil-free-lightweight-8-gallon-air-compressor/
- OSHA, Hazard Information Bulletin: PVC pipe in above-ground compressed-air service: https://www.osha.gov/publications/hib19880520
Editor’s note: Herbert Arnold is the only maker here that publishes an air consumption figure, and compressor noise ratings are measured inconsistently between brands. Treat the sizing and noise guidance here as comparative, verify air pressure and flow requirements with your torch manufacturer, and follow the manufacturer’s manual and local code for your specific setup.