line and duct burners
NP-LE AIRFLO®
Series NP-LE AIRFLO® burners are designed for direct heating of fresh, clean air for low and medium temperature air heating applications
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Overview
The MAXON NP-LE EMISSIONS AIRFLO® Natural Gas Burner is designed for direct-fired make-up air and process applications. This industrial burner provides improved emissions performance over other gas burners with significantly lower levels of CO and NO2. Higher capacities of up to 1,000,000 Btu/hr/ft (300 kW/ft) make NP-LE a more economical solution for your application. The NP-LE Series easily meets ANSI/CSA/CE direct fired industrial heating standards and is available in low pressure versions and in corrosion-proof materials
Features & Benefits:
Features & Benefits:
- Designed for direct-fired make-up air and process applications
- Improved emissions performance over MAXON’s standard “NP” AIRFLO® Burner, with significantly lower levels of CO and NO2
- High capacity - up to 1,000,000 Btu/h/ft
- Short flame length
- Available in low pressure version and corrosion resistant materials
Specifications
Air/Exhaust/Flue Gas Temperatures
- Maximum Upstream Air Temperature
- Downstream: ≤ 1000 deg F (≤ 840 deg F for aluminum bodies)
- Upstream:≤ 600 deg F (≤ 450 deg F for aluminum bodies)
Ignition, Flame & Supervision Specifications
- Ignition Transformer Requirement
- ≥ 5000 V/200 VA
- Profile Plate Requirement
- Minimum ~152 mm (6 in) silhouette profile plate surrounding burner leading edge
- Flame Detection
- Flame rod or UV scanner, depending on end‑plate selection
Air & Combustion Air Specifications
- Process Air Velocity
- 1700 to 3000 fpm across burner mixing plates
Installation & Mounting Specifications
- Mounting Orientation
- Mount flames parallel to airflow direction (not perpendicular); maintain uniform velocity millimetre
Electrical Specifications
- Maintenance Interval
- Inspect at least annually (more frequently for continuous process duty); do not enlarge ports
Dimensions & Size Specifications
- Gas Port Drill Sizes
- #43 typical; #47 at intersections of 12x6 tees and 36 in back‑inlets; NP2‑LE AL uses #47 outside rows/#43 inside
- Burner Section Sizes
- 12 and 36 in back‑inlet sections
- 12x6 tee
- 6, 12, 18, 24 in straight
- 6x6 elbow
Actuation, Valve & Motion Control Specifications
- Ignition System
- Raw gas pilot integrated in end plate; direct spark ignition possible per local codes
Performance, Flow & Capacity
- Turndown Ratio
- 30:1
Performance Specifications
- Pilot Capacity
- Nominal 25,000 Btu/h pilot
Processing & Performance Metrics
- Capacity Range
- Max - 1,000,000 Btu/h per lineal foot, Min - 25,000 Btu/h per lineal foot (application‑dependent)
Pressure Specifications
- Pressure Drop
- 0.3 to 1 in wc across burner and profile plate (Process Air)
- Gas Pressure
- Butane - NP1‑LE ≈7.7 mbar (≈3.1 in wc); NP2‑LE ≈3.7 mbar (≈1.5 in wc) for 300 kW/ft
- Natural Gas - NP1‑LE ≈31.7 mbar (≈12.7 in wc); NP2‑LE ≈15.2 mbar (≈6.1 in wc) for 300 kW/ft
- Propane - NP1‑LE ≈12.8 mbar (≈5.1 in wc); NP2‑LE ≈6.2 mbar (≈2.5 in wc) for 300 kW/ft
Combustion, Mixing & Fuel Dynamics
- Mixing Plates
- Stainless Steel 430 (1.4016)
Burner/Flame‑Related Lengths
- Flame Length
- 150 to 700 mm (6 to 28 in), increasing with heat input and decreasing with higher air velocity
Overview
- Burner Type
- In‑duct, direct‑fired line burner for fresh air/process air (raw gas) with profile plate velocity control
- Model Name
- NP1‑LE and NP2‑LE AIRFLO®
Fuel, Gas & Media Specifications
- Fuel Type
- Natural Gas, Propane, Butane
Material Specifications
- Material
- NP1‑LE: Standard (Cast Iron), AL (Aluminum Body), ALSS (Aluminum Body/Back‑Up Bars, Nickel‑Plated End Plates, Stainless Steel Fasteners)
- NP2‑LE: Standard or AL
Air/Exhaust/Flue Gas Temperatures
- Maximum Upstream Air Temperature
- Downstream: ≤ 1000 deg F (≤ 840 deg F for aluminum bodies)
- Upstream:≤ 600 deg F (≤ 450 deg F for aluminum bodies)
Ignition, Flame & Supervision Specifications
- Ignition Transformer Requirement
- ≥ 5000 V/200 VA
- Profile Plate Requirement
- Minimum ~152 mm (6 in) silhouette profile plate surrounding burner leading edge
- Flame Detection
- Flame rod or UV scanner, depending on end‑plate selection
Air & Combustion Air Specifications
- Process Air Velocity
- 1700 to 3000 fpm across burner mixing plates
Installation & Mounting Specifications
- Mounting Orientation
- Mount flames parallel to airflow direction (not perpendicular); maintain uniform velocity millimetre
Electrical Specifications
- Maintenance Interval
- Inspect at least annually (more frequently for continuous process duty); do not enlarge ports
Dimensions & Size Specifications
- Gas Port Drill Sizes
- #43 typical; #47 at intersections of 12x6 tees and 36 in back‑inlets; NP2‑LE AL uses #47 outside rows/#43 inside
- Burner Section Sizes
- 12 and 36 in back‑inlet sections
- 12x6 tee
- 6, 12, 18, 24 in straight
- 6x6 elbow
Actuation, Valve & Motion Control Specifications
- Ignition System
- Raw gas pilot integrated in end plate; direct spark ignition possible per local codes
Performance, Flow & Capacity
- Turndown Ratio
- 30:1
Performance Specifications
- Pilot Capacity
- Nominal 25,000 Btu/h pilot
Processing & Performance Metrics
- Capacity Range
- Max - 1,000,000 Btu/h per lineal foot, Min - 25,000 Btu/h per lineal foot (application‑dependent)
Pressure Specifications
- Pressure Drop
- 0.3 to 1 in wc across burner and profile plate (Process Air)
- Gas Pressure
- Butane - NP1‑LE ≈7.7 mbar (≈3.1 in wc); NP2‑LE ≈3.7 mbar (≈1.5 in wc) for 300 kW/ft
- Natural Gas - NP1‑LE ≈31.7 mbar (≈12.7 in wc); NP2‑LE ≈15.2 mbar (≈6.1 in wc) for 300 kW/ft
- Propane - NP1‑LE ≈12.8 mbar (≈5.1 in wc); NP2‑LE ≈6.2 mbar (≈2.5 in wc) for 300 kW/ft
Combustion, Mixing & Fuel Dynamics
- Mixing Plates
- Stainless Steel 430 (1.4016)
Burner/Flame‑Related Lengths
- Flame Length
- 150 to 700 mm (6 to 28 in), increasing with heat input and decreasing with higher air velocity
Overview
- Burner Type
- In‑duct, direct‑fired line burner for fresh air/process air (raw gas) with profile plate velocity control
- Model Name
- NP1‑LE and NP2‑LE AIRFLO®
Fuel, Gas & Media Specifications
- Fuel Type
- Natural Gas, Propane, Butane
Material Specifications
- Material
- NP1‑LE: Standard (Cast Iron), AL (Aluminum Body), ALSS (Aluminum Body/Back‑Up Bars, Nickel‑Plated End Plates, Stainless Steel Fasteners)
- NP2‑LE: Standard or AL
- Maximum Upstream Air Temperature : Downstream: ≤ 1000 deg F (≤ 840 deg F for aluminum bodies)|Upstream:≤ 600 deg F (≤ 450 deg F for aluminum bodies)
- Ignition Transformer Requirement : ≥ 5000 V/200 VA
- Profile Plate Requirement : Minimum ~152 mm (6 in) silhouette profile plate surrounding burner leading edge
- Process Air Velocity : 1700 to 3000 fpm across burner mixing plates
- Mounting Orientation : Mount flames parallel to airflow direction (not perpendicular); maintain uniform velocity millimetre
- Maintenance Interval : Inspect at least annually (more frequently for continuous process duty); do not enlarge ports
- Gas Port Drill Sizes : #43 typical; #47 at intersections of 12x6 tees and 36 in back‑inlets; NP2‑LE AL uses #47 outside rows/#43 inside
- Burner Section Sizes : 12 and 36 in back‑inlet sections|12x6 tee|6, 12, 18, 24 in straight|6x6 elbow
- Ignition System : Raw gas pilot integrated in end plate; direct spark ignition possible per local codes
- Flame Detection : Flame rod or UV scanner, depending on end‑plate selection
- Turndown Ratio : 30:1
- Pilot Capacity : Nominal 25,000 Btu/h pilot
- Capacity Range : Max - 1,000,000 Btu/h per lineal foot, Min - 25,000 Btu/h per lineal foot (application‑dependent)
- Pressure Drop : 0.3 to 1 in wc across burner and profile plate (Process Air)
- Mixing Plates : Stainless Steel 430 (1.4016)
- Gas Pressure : Butane - NP1‑LE ≈7.7 mbar (≈3.1 in wc); NP2‑LE ≈3.7 mbar (≈1.5 in wc) for 300 kW/ft|Natural Gas - NP1‑LE ≈31.7 mbar (≈12.7 in wc); NP2‑LE ≈15.2 mbar (≈6.1 in wc) for 300 kW/ft|Propane - NP1‑LE ≈12.8 mbar (≈5.1 in wc); NP2‑LE ≈6.2 mbar (≈2.5 in wc) for 300 kW/ft
- Flame Length : 150 to 700 mm (6 to 28 in), increasing with heat input and decreasing with higher air velocity
- Burner Type : In‑duct, direct‑fired line burner for fresh air/process air (raw gas) with profile plate velocity control
- Model Name : NP1‑LE and NP2‑LE AIRFLO®
- Fuel Type : Natural Gas, Propane, Butane
- Material : NP1‑LE: Standard (Cast Iron), AL (Aluminum Body), ALSS (Aluminum Body/Back‑Up Bars, Nickel‑Plated End Plates, Stainless Steel Fasteners)|NP2‑LE: Standard or AL
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