Easily calculate CFM (Cubic Feet per Minute) and CMH (Cubic Meters per Hour) for various air filters with our free online calculator. Perfect for HVAC professionals, engineers, and facility managers, this tool supports multiple filter types, including EU-3, EU-4, EU-5, EU-6, EU-7, EU-8, EU-9, EU-12/13/14 (Normal & Super Flow), and Minipleat filters (Nano, Micro, Mili Pleat variants).

Simply select your filter type, enter dimensions (height, width, depth), and get instant CFM & CMH results—no page refresh needed!

Key Features:

✅ Responsive Design – Works flawlessly on desktops, tablets, and mobile devices
✅ Accurate Calculations – Based on industry-standard formulas
✅ Multiple Filter Types – Supports 16+ filter configurations
✅ User-Friendly – Auto-fill for depth & velocity based on filter selection
✅ AdSense Compliant – Non-intrusive ads with optimal content-to-ad ratio

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SEO & Compliance Optimized:

✔ Fast-loading & mobile-friendly
✔ Clear value proposition – No misleading elements
✔ Semantic HTML for better search engine visibility
✔ Properly spaced text & labels for readability on all devices
✔ AdSense policy-compliant – Original content, transparent functionality

Try it now at www.calculator-app.site and simplify your airflow calculations!

Why Choose Our Calculator?
🔹 No Installation Needed – Works directly in your browser
🔹 Real-time Results – AJAX-based for seamless updates
🔹 Detailed Filter Support – Covers standard & custom depths
🔹 Trusted by Professionals – Accurate, reliable, and easy to use

Perfect for HVAC system design, cleanroom validation, industrial ventilation, and more!

Note: This tool complies with Google AdSense policies, ensuring no disruptive ads, quality content, and full responsiveness for all users.

Bookmark now for quick access! 📌

1. Standard CFM Formula (Most Filter Types)

For EU-3/EU-4 (25mm), EU-5/EU-6/EU-7, EU-8/EU-9, EU-12/13/14, and Minipleat Filters: 

CFM = (Height / 305) × (Width / 305) × Velocity (FPM)

(Where dimensions are in mm, and Velocity is in feet per minute, FPM)

2. Special Case: EU-3/EU-4 (50mm Deep) CFM Formula

Includes a cap of 2000 CFM:

CFM = MIN[(Height/305 × Width/305 × Velocity × Depth/50), 2000]

CMH = CFM ÷ 0.5883 

*(1 CMH = 0.5883 CFM)*

Example Calculation

For a 610mm × 610mm EU-5 filter (300mm deep) with 500 FPM velocity:

CFM = (610/305) × (610/305) × 500 = 2 × 2 × 500 = **2000 CFM**  
CMH = 2000 ÷ 0.5883 ≈ **3399 CMH**