Oil furnace nozzle size? On my oil furnace I use a 1.00, 80*, A, ...

On my oil furnace I use a 1.00, 80*, A, nozzle.
The guy at the parts store is solely selling a 1.00, 80*, H.

I know that the letter at the run out has to do beside the spray pattern of the fuel grease. My question finally:
What is the difference contained by the nozzle? and, Will it work okay as a replacement part within my furnace?

I know it is best to stick with the imaginative part but they voice this is pretty much the same. Thanks within advance.
Answers:    A and H are both hollow spray pattern, different manufacturers use different packages. You will not notice a difference between the two nozzles.

Just get sure that you install the electrodes the proper distance from the end of the nozzle and from respectively other, as you can run the risk of putting out the spark if they are to far forward.