High Blast Mixers are compact air/gas mixers used in installations where high pressure air is available. These economical units are ideally suited to manual control operation for a wide range of heating applications where low pressure air is not available. High Blast Mixers use small amounts of high pressure air (approximately 10%) to pickup incoming gas at the mixer. Air at 20 to 100 psig is passed through a primary modified venturi which inspirates an equal amount of gas and elevates its pressure. The resultant mixture of one part air and one part gas is delivered to the main orifice at approximately 40% of the inlet air pressure. The Hijector (the main venturi of the High Blast Mixer) efficiently entrains large quantities of combustion air and delivers the mixture to the burner system. The mixture produces a hard, sharp, clear blue, typical blast flame. The high pressure air valve and primary air shutter provide for wide ranges of adjustment. Injector type design of high pressure stage prevents air feed back into the gas line. Capacities listed in the table are for 90% primary air and may be increased where adequate secondary is available.
CAPACITY TABLE
Catalog
Number
Min.
Burner
Area
Sq.
Inches
Gas in 1000's BTU/hr. and Air in CFM
Air Pressure, psig
20
40
60
80
100
120
Average Mixture Pressure, Inches W.C.
2.5"
5"
7.5"
10"
12.5"
15"
Gas
Air
Gas
Air
Gas
Air
Gas
Air
Gas
Air
Gas
Air
6 HB
0.19
40
0.8
55
1.2
68
1.5
80
1.7
87
1.9
95
2.1
8 HB
0.30
65
1.8
90
2.4
110
3.0
125
3.4
140
3.8
156
4.2
10 HB
0.67
145
3.9
205
5.5
250
6.8
290
7.8
325
8.7
355
9.5
12 HB
1.06
230
5.3
320
7.3
395
9.0
450
10.4
500
11.5
555
12.6
16 HB
1.85
400
7.1
565
10.0
700
12.3
800
14.2
880
15.8
980
17.3
20 HB
2.49
550
9.8
770
13.8
950
17.0
1100
19.6
1220
21.8
1330
24.0
24 HB
3.25
680
12.3
960
17.3
1180
21.4
1360
24.6
1520
27.4
1660
30.0
32 HB
5.54
1200
20.5
1690
28.8
2080
35.6
2400
41.0
2680
45.5
2920
49.8
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