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📏 Size it right, every time — the pro’s secret weapon!
The Air Duct Sizing Calculator by DEFLECTAIR is a compact, handheld sliding tool designed for precise sizing of supply and return duct systems using both Equal Friction and Velocity Reduction methods. Featuring detailed scales for friction, velocity, duct dimensions, weight, and surface area, plus a back panel with equivalent feet for fittings and pressure drop charts, it’s an all-in-one HVAC reference. Built from durable, water-resistant materials with reinforced edges, this 4" x 8.5" calculator is engineered for professional use on the jobsite, helping HVAC managers and technicians achieve fast, accurate duct sizing with confidence.
| ASIN | B006XIQ7DM |
| Best Sellers Rank | #40,302 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,111 in HVAC |
| Brand | HVACCHARTS |
| Calculator Type | Air Duct Sizing |
| Customer Reviews | 4.6 4.6 out of 5 stars (940) |
| Display Type | Physical |
| Enclosure Material | Other |
| Item Dimensions L x W | 4"L x 8.5"W |
| Manufacturer | DEFLECTAIR |
| Mfr Part Number | 9W-7LPQ-JTV2 |
| Model Number | 9W-7LPQ-JTV2 |
| Power Source | Battery Powered |
| Screen Size | 4 Inches |
| UPC | 683405356684 |
| Unit Count | 1.0 Count |
R**N
Is as described
Fast shipping is as described
A**Y
Súper buena herramienta y fácil de utilizar y necesaria para el trabajo de ductos de HVAC
K**K
Good quality.
Perfect air duct slide calculator. I removed the stick-on bar code the first day , and it peeled off cleanly.
K**N
Sticker
There was a paper sticker on the back of the slide rule that was on top of a lot of information and it was difficult to get off without ruining it.
M**Y
Doesn’t work with live ducks
Works good for air ducks but not living air ducks That quack
M**.
Sticker on back was easy to take off
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
R**.
Calculating Duct Size In A Breeze Is Easy
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. 👍
D**F
Duculator
Sturdy good quality should last fir a long time
Trustpilot
Hace 2 semanas
Hace 1 mes