HVAC ডাক্ট ক্যালকুলেটর

ব্লগ

Calculations

TEL: Total Effective Length Calculation Guide for HVAC Ducts

Learn how to calculate Total Effective Length (TEL) for HVAC duct sizing. Includes equivalent length tables for fittings, worked examples, and metal vs flex adjustments.

Calculations

CFM Formula for HVAC Systems: Every Equation You Need

All the essential CFM formulas for HVAC duct sizing in one place. Covers airflow calculation, BTU to CFM conversion, duct area formulas, and velocity relationships.

Calculations

BTU to Tonnage Conversion Guide for HVAC Systems

Convert BTU to tons for HVAC cooling systems. Learn the formula, see conversion tables, and understand how tonnage connects to CFM airflow and duct sizing.

HVAC Concepts

What Is Airflow Velocity in Ductwork and Why It Matters

Airflow velocity in HVAC ductwork is the speed of air moving through ducts, measured in feet per minute. Learn acceptable velocities, noise limits, and sizing impact.

HVAC Concepts

Supply vs Return Ductwork Explained

Understand the difference between supply and return ducts in HVAC systems. Learn how they work together, sizing differences, and why balanced airflow matters.

Technical Guide

A Complete Guide to Friction Rate in HVAC Design

Everything you need to know about friction rate in HVAC duct design: what it is, how to calculate it, common values, and best practices for different applications.

Practical Guide

Duct Sizing for Home HVAC: Room by Room Guide

Complete guide to sizing HVAC ducts for residential homes. Covers room by room CFM requirements, trunk and branch sizing, and practical tips for homeowners.

Practical Guide

Duct Sizing for Contractors: Job Site Reference Guide

A practical field guide for HVAC contractors covering duct sizing calculations, quick reference charts, installation tips, and common job site mistakes to avoid.

Troubleshooting

Wrong Duct Size Problems and How to Fix Them

Incorrectly sized ducts cause noise, comfort issues, high energy bills, and equipment failure. Learn how to identify wrong duct sizes and the solutions that work.