🛑 NFPA 69 (Mechanical Flap Valve Setback Distance Lmin Ft, Chemical Suppression)

Explosion Isolation Flap Valve Calculator

Size mechanical back-flap explosion isolation valves (ATEX / NFPA 69 certified) and active chemical suppression cannon barriers on inlet ductwork feeding dust collectors: calculate minimum and maximum setback distance (L_min and L_max based on flame speed and valve mechanical closure time to prevent deflagrations from propagating backward into factory spaces), and safety profits.

1. Project & Operating Inputs

Inlet Ducts Requiring Isolation (Duct Count e.g. 4 Main Intake Runs)

Duct Diameter (Inches e.g. 24.0" Heavy Intake Duct)

Customer Bid Price for Supplied & Certified Flap Valve System ($ / Unit)

NFPA 69 Flap Valve, Optical Sensor, Microswitch Lock, Rigger Labor ($ / Unit)

2. Financial Breakdown & Yield

NFPA 69 EXPLOSION ISOLATION

Turnkey Explosion Isolation Profit

Combustible Dust Safety Systems Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost