Type A nozzles are mainly used on burners with a hollow cone air pattern and for throughputs up to 2.00 GPH. The droplet distribution is concentrated on the outside of the cone and results in good ignition and low-noise combustion.
| Spray Pattern: | A |
|---|---|
| Gallons Per Hour: | 0.65 |
| Type: | Hollow Cone |
| Angle: | 80° |
| Material: | Brass |
| Application: | Replacement Part |

If you could point the nozzle towards a wall, the hollow nozzle would produce a ring pattern (no oil inside the ring). The solid would produce a filled circle pattern (oil completely covers the circle).
It is detailed here http://www.delavaninc.com/pdf/Fuel_Nozzles_for_Burners.PDF