Air Duct Sizing Calculator

Perfect air duct slide calculator. I removed the stick-on bar code the first day , and it peeled off cleanly.

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.

Sturdy good quality should last fir a long time

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.

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. 👍

As advertised. Received quickly and in good condition.

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.

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