🚪 Tunnel Portals (High-Velocity Air Barrier 4,000 FPM, Prevents Ambient Wind Infiltration)

Tunnel Portal Air Curtain Calculator

Size high-velocity downward planar air curtain nozzles installed at road and transit tunnel entrance portals: calculate jet discharge velocity (3,500 to 5,000 FPM) resisting external ambient wind gusts (up to 25 MPH), prevent unwanted thermal stack air exchange, contain emergency tunnel smoke, and tunnel environmental contracting profits.

1. Project & Operating Inputs

Tunnel Portal Width (Feet e.g. 36.0 ft Portal Opening)

Design Opposing Wind Speed (MPH e.g. 20.0 MPH Ambient Wind Resistance)

Customer Bid Price for Supplied & Landed Portal Air Curtain Skid ($)

Centrifugal Blower Array, Stainless Slot Nozzles, Variable Frequency Drives ($)

2. Financial Breakdown & Yield

TUNNEL PORTAL AIR BARRIERS

Turnkey Portal Air Barrier Profit

Tunnel Entrance Mechanical Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost