HVAC Toolbox – Charts, Calculators, Cheat Sheets & Field References
Welcome to the HVAC Toolbox — your one-stop reference hub for HVAC charts, calculators, cheat sheets, and design tools. Whether you’re in the field, estimating, or designing, this page gives you the essentials: sheet metal gages, duct sizing tables, airflow formulas, refrigerant data, and more. Bookmark it and come back anytime.
🗂️ Section 1: Sheet Metal & Ductwork
Sheet Metal & Duct Sizing References
- 📏 Sheet Metal Gage Chart
Gauge #, thickness (in/mm), weight (lbs/ft²).
📊 View the Full Sheet Metal Weight Chart
Explore the complete galvanized sheet metal gauge-to-weight chart with thickness in inches/mm and weight in lb/ft² and kg/m².
👉 Go to the Galvanized Sheet Metal Chart Page - 📐 Duct Sizing Chart (Round & Rectangular Equivalents)
Includes friction rate assumptions.
➤ Interactive table
➤ Download PDF - 🌀 Fan Laws Quick Reference
RPM, HP, airflow, pressure relationships.
➤ Fan law equations
➤ Mini calculator - 🔩 Duct Hanger Spacing Standards
As per SMACNA guidelines.
➤ View chart
➤ Downloadable reference
🚧 The following tools and resources are coming soon:
🌬️ Section 2: Airflow & Static Pressure
Airflow & Pressure Tools
- 🔄 CFM Calculation Formulas
Q = A × V and other basic airflow equations.
➤ Equation cheat sheet
➤ Example calculation - 📉 Static Pressure Guidelines
Typical drops for filters, coils, ductwork.
➤ Chart/table by component
➤ PDF available - 🌡️ BTU to CFM Converter
Use sensible heat formula.
➤ Mini calculator or chart
➤ How-to post link
❄️ Section 3: Refrigerants & Piping
Refrigerant & Line Sizing Tools
- 🧊 Refrigerant Pressure-Temperature Charts
R-22, R-410A, R-134a, etc.
➤ Download laminated-style PDF
➤ Embedded quick table - 🔧 Refrigerant Line Sizing Chart
For split systems — up to 100 ft.
➤ Download or view interactive version - 🔄 Subcooling & Superheat Quick Reference
➤ Step-by-step field method
➤ Rule-of-thumb ranges
📘 Section 4: Symbols & Cheat Sheets
Blueprint Reading & Field Docs
- 🏷️ HVAC Symbols Cheat Sheet
Common HVAC plan symbols (PDF).
➤ View inline
➤ Download - 📚 HVAC Abbreviations & Acronyms
TYP, OA, VAV, EF, MAU, etc.
➤ A–Z list
➤ Searchable format - 🧮 Construction Math for HVAC
Fractions, geometry, triangle rules.
➤ Downloadable cheat sheet
⚙️ Section 5: Tools & Downloads
Downloadable PDFs & Tools
| Tool | Description | Download |
|---|---|---|
| Sheet Metal Gage Chart | Convert gage # to thickness & weight | |
| Round vs Rectangular Duct Table | Friction loss equivalents | |
| HVAC Symbols Sheet | Plan reading helper | |
| Static Pressure Drop Table | Acceptable drops per component | |
| PT Chart Pack | All major refrigerants |
📥 Get the Ultimate HVAC Field Pack
Download 5 essential reference PDFs + future updates
[Name] [Email] [Download Now]
🔁 Final Section: Related Tools & Posts
Continue Learning & Exploring
How to Read HVAC Plans (Online Course)
How to Use a Sheet Metal Gage Chart (Post)
How to Size Ductwork with the Friction Rate Method (Post)
HVAC Estimating Spreadsheet (Product)
