Your cart is empty.
Your cart is empty.The Duct Sizing Calculator is a hand held sliding calculator used for sizing supply and return duct systems using the equal friction, or velocity reduction design method. Front of calculator includes scales for friction, velocity, round duct size, weight per linear foot of round duct, surface area in square feet per lineal foot of round duct, rectangular equivalents of round duct sizes, weight per linear foot of rectangular duct and surface area in square feet per linear foot of Rectangular duct. Back of calculator has equivalent feet of straight duct for commonly used fittings, corrected pressure drop chart, and many HVAC formulas. Pull out slide has recommended duct velocities, recommended gauges for sheet metal, and much more. The photo shows both sides of the tool. This slide is made of thick durable water resistant paper stock with glued edges and corner rivets. Tool measures 4 inches high and 8.5 inches wide.
Wounded Dove
Reviewed in the United States on February 27, 2024
As advertised. Received quickly and in good condition.
Dan Garloff
Reviewed in the United States on April 9, 2024
Sturdy good quality should last fir a long time
Kathy Hollenbeck
Reviewed in the United States on April 30, 2023
Perfect air duct slide calculator. I removed the stick-on bar code the first day , and it peeled off cleanly.
Marco B.
Reviewed in the United States on October 19, 2021
I had seen some leave negative feedback because of the sticker on the back. It wasn't hard taking it off. Just peel it with your nail. Comes right off. Great tool. Prefer it over phone apps
Loren Deseth
Reviewed in the United States on April 2, 2019
This is a great chart to have for properly sizing duct work. With new furnaces, rule of thumb doesn't cut it any more. Back of slide has a chart for calculating friction loss and equivalent length of duct work for most fittings. I use this chart every day for my installs.
Rhinos' Pro.
Reviewed in the United States on September 19, 2018
I had a duct calculator for about 10 years, but with time it wore out. I was hoping to get one similar to the one I had and took the risk in getting this one. I was glad when I got it, because I was able to read this one as if it were my old one. I am very well pleased with it. Has the same features as my old one did. 👍
Eugene P' Lovas
Reviewed in the United States on September 1, 2017
tslide rule, one step duct size calculator was fine except for one problem. THE BACK SIDE HAS AN INVENTORY STICKER APPLIED TO THE LOWER BOTTOM, THAT IS UNREMOVABLE MAKING THE FORMULAS UNDER THE STICKER UN-READABLE. THEY NEED TO USE STICKERS THAT ARE EASILY REMOVABLE WITHOUT DAMAGE TO THE CALCULATOR.
Julie
Reviewed in the United States on June 23, 2014
They were out of stock on air duct sizing calculator but upgraded me to a Super Cool slide rule that provides both the superheat and subcooling chart for R-22 and R-410. It also flips open for air duct calculation. It wasn't exactly what I was looking for but as for their customer service, they are quick to respond and keep you happy.
Recommended Products
