Regulatory Text: 
Rule 701.   Gas Fired Steam Generating Units.

(Approved by EPA 03/02/76 (42 FR 08967) at 52.2270(c)(05) effective 03/02/76.) 

701.1.  Rules 701.2, 701.3 and 701.4 shall apply only in the Dallas-Fort Worth and Houston-Galveston Air Quality Control Regions. 

701.2.  No person may cause, suffer, allow or permit emissions of nitrogen oxides, calculated as nitrogen dioxide, from any "opposed fired" steam generating unit of more than 600.000 lbs/hour maximum continuous steam capacity to exceed 0.7 lbs/million Btu heat input, maximum two-hour average, at maximum steam capacity.  An "opposed fired" steam generating unit is defined as a unit having burners installed on two opposite vertical firebox surfaces.  

701.3.  No person may cause, suffer, allow or permit emissions of nitrogen oxides, calculated as nitrogen dioxide, from any "front fired" steam generating unit of more than 600,000 lbs/hour maximum continuous steam capacity to exceed 0.5 lbs/million Btu heat input, maximum two-hour average, at maximum steam capacity.  A "front fired" steam generating unit is defined as a unit having all burners installed in a geometric array on one vertical firebox surface. 

701.4.  No person may cause, suffer, allow or permit emissions of nitrogen oxides, calculated as nitrogen dioxide, from any "tangential fired" steam generating unit of more than 600,000 lbs/hour maximum continuous steam capacity to exceed 0.25 lbs/million Btu heat input, maximum two-hour average, at maximum steam capacity.  A "tangential fired" steam generating unit is defined as a unit having burners installed on all corners of the unit at various elevations. 

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