How can I find out the size & angle for a Beckett model "A" oil nozzle ?

how can I find out the size & angle for a Beckett model "A" oil nozzle ?

Measure the firebox

LxWxH
This is for angle of spread

Then
Size in GPH is based on the fire rate of the boiler or furnace (IE BTU's)

Then you need to decide is you should choose solid,hollow,or combo of both for the flame cone.

See below for examples and instructions

http://www.delavaninc.com/pdf/total_look.pdf


Monarch Oil Burner Nozzles - Spray Patterns (http://www.monarchnozzles.com/4_3.htm)


Ontor.com HVAC / Oil Heating Products / Oil Burner Nozzles (http://www.ontor.com/index_HVAC_Oil+Heating+Products_items_Oil+Burner+N ozzles.html)


http://hago.danfoss.com/PCMPDF/DKBDPD080A122.pdf


This is something that you do not guess about so I just provided some facts for you.