Design features and benefi ts of 3065 North American aspirators and gas 
mixers

3065 Aspirator Mixers are used to create a uniform air / fuel 
mixture to feed premix burner nozzles. Energy from blower air 
passing through the 3065 venturi creates suction, which entrains 
a proportional fl ow of gas at atmospheric (zero gauge) pressure. 
Multiple premix burner nozzles fed by a 3065 can be controlled 
by a single manual or motorized air valve.

Proper air/fuel ratio is initially set by adjusting the integral 
V-port* valve built into the mixer. The ratio is maintained from 
high fi re to low by an “atmospheric regulator” (zero governor) or 
by cross connecting the regulator (e.g., North American’s 7218). 

For coke oven, manufactured, and other gases corrosive to brass,
specify 3065-  -K Mixer with iron/steel parts in place of brass.

For an observation port in place of a -0 plug (no rod) specify 
3065- -0-OBS (3065-1 to -8 sizes).

3065 ASPIRATOR AIR/GAS MIXER FEATURES

Mixes air with any fuel gas from 500 to 3,200 Btu/ft 3 HHV

Over 200 size combinations to fi t most applications

3/4" to 8" air inlet 

&

 premix outlet

Effi

  cient design with low pressure loss

Suitable for single or multiple premix nozzles 

Rugged cast iron construction* for long life

Compact construction for easy installation

Mount in any position 

Interchangeable displacement rods for optimum mixture 

    pressure and suction ratio. 

Rods can be changed without breaking air or gas piping

Built in gas adjustment valve cartridge*

Gas adjustment cartridge 

&

 gas inlet are interchangeable*

AIR INLET

BURNER AIR VALVE

GAS 

INLET

V-PORT VALVE

ASPIRATOR MIXER

DISPLACEMENT 

ROD

BURNER

ATMOSPHERIC REGULATOR

Figure 1.

Typical arrangement of 3065 Aspirator Mixer with 

burner, atmospheric regulator, and air valve.

*3065-9 Mixers have fabricated steel construction and a separate 1127-7-F 

limiting orifi ce butterfl y valve in the gas line upstream of the mixer.

Rated Air Flow of each 3065 without rod (scfh)

  Air P. (osi) 

12 

16

  Mixer D.P. ("wc) 

4.9 

9.8 

14.8 

19.7

  Mixture P. ("wc) 

8

 3065-0-0 

480 

680 

830 

960

 3065-1-0 

650 

930 

1130 

1310

 3065-2-0 

1220 

1730 

2120 

2450

 3065-3-0 

1850 

2620 

3210 

3710

 3065-3-S0 

2740 

3870 

4750 

5480

 3065-4-0 

3200 

4530 

5550 

6410

 3065-4-S0 

3960 

5600 

6860 

7930

 3065-5-0 

4440 

6280 

7700 

8890

 3065-5-S0 

6420 

9070 

11110 

12800

 3065-6-0 

6640 

9400 

11510 

13300

 3065-6-S0 

10950 

15500 

19000 

21900

 3065-7-0 

13200 

18700 

22900 

26400

 3065-8-0 

34100  48200 

59100 

68300

 3065-8-S0 

51700 

73200 

89600 

103500

 3065-9-0 

65800  97300 

1119000  138000

Bulletin 3065

page 2

Catalog Combustion 2021 - Page 0029

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