LIMA Air Duct Calculator HVAC Tool – Duct Size Converter & Velocity Estimator

LIMA Air Duct Calculator – Professional HVAC Sizing Tool

This durable HVAC air duct calculator from LIMA is an essential tool for contractors, engineers, and technicians. Designed for field and shop use, it provides a fast and accurate way to calculate:

• Duct conversion from round to equivalent rectangular sizing

• Register & grille selection for effective air velocity, CFM throw, and terminal pressure loss

• Duct weight per linear foot, simplifying material and cost estimates

Features:

• Intuitive slide calculator design

• Ideal for ductwork layout and sizing during system installation or retrofits

• Used in HVAC performance evaluation and airflow diagnostics

• Compact and easy to store in tool bags or field kits

Model: Air Duct Calculator

Brand: LIMA

REM Number: 4G8341

Made for: HVAC airflow systems – not intended for gas systems

Whether you’re sizing duct registers, estimating weight, or checking airflow, this is your go-to manual calculator for quick reference in the field.

Important Notice – Propane Parts, Accessories, and Regulators

This product, including but not limited to propane parts, accessories, fittings, hoses, valves, and regulators, must be installed and serviced by a licensed professional in accordance with all applicable local, state, and federal codes, regulations, and standards.

The seller assumes no responsibility for the installation, inspection, application, maintenance, or use of this product.

It is the sole responsibility of the buyer to ensure the product is appropriate for their intended application and that it is installed correctly by a qualified individual.

Improper installation, maintenance, or use of propane products may result in serious injury, death, fire, explosion, or property damage.

The buyer accepts all risks, liabilities, and potential consequences associated with the use of this product.

By purchasing this item, the buyer acknowledges that they have read, understood, and agreed to these terms and confirm that installation and use will be conducted by a properly licensed and qualified professional.