⚠️ NFPA 33 Section 7.2 (Limiting Flammable Solvent Vapor to <25% LEL Safety Limit)

Spray Booth Lower Explosive Limit (LEL) Calculator

Calculate solvent evaporation rates and required dilution airflow to prevent explosive atmosphere formation in paint spray enclosures under NFPA 33 Section 7.2 & NFPA 86: calculate required ventilation rate (diluting flammable solvent vapors strictly below 25% of the Lower Explosive Limit LEL during peak gun atomization), and explosion-proof safety margins.

1. Project & Operating Inputs

Peak Liquid Paint Spray Rate (Gallons / Hour e.g. 6.0 GPH Paint Sprayed)

Solvent Content (% by Volume e.g. 65.0% VOC Solvent Formulation)

Customer Bid Price for Supplied LEL Sensor Array & Safety Interlock ($)

Class I Div 1 Optical Flame Detectors, LEL Infrared Sensors, Safety Tech ($)

2. Financial Breakdown & Yield

NFPA 33 LEL SAFETY VENTILATION

Turnkey Spray Safety System Profit

Industrial Safety Compliance Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost