--- product_id: 63878322 title: "Air Duct Sizing Calculator" brand: "hvaccharts" price: "₹ 2637" currency: INR in_stock: true reviews_count: 8 category: "Hvaccharts" url: https://www.desertcart.in/products/63878322-air-duct-sizing-calculator store_origin: IN region: India --- # Precision sizing scales Dual design methods Durable, water-resistant build Air Duct Sizing Calculator **Brand:** hvaccharts **Price:** ₹ 2637 **Availability:** ✅ In Stock ## Summary > 📏 Size it right, every time — the pro’s secret weapon! ## Quick Answers - **What is this?** Air Duct Sizing Calculator by hvaccharts - **How much does it cost?** ₹ 2637 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.in](https://www.desertcart.in/products/63878322-air-duct-sizing-calculator) ## Best For - hvaccharts enthusiasts ## Why This Product - Trusted hvaccharts brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dual Method Mastery:** Supports both Equal Friction and Velocity Reduction methods to fit any professional duct sizing standard. - • **Built to Last On-Site:** Constructed from thick, water-resistant paper with reinforced edges and rivets to withstand jobsite wear and tear. - • **All-in-One HVAC Reference:** Backside features equivalent feet for fittings, pressure drop charts, and essential HVAC formulas—your pocket engineer. - • **Compact Yet Comprehensive:** Measuring just 4" x 8.5", it’s the ultimate portable tool for fast, accurate duct sizing wherever you go. - • **Precision at Your Fingertips:** Handheld sliding calculator with detailed friction, velocity, and duct size scales for flawless HVAC duct design. ## Overview 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. ## Description 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. Review: Is as described - Fast shipping is as described Review: Súper buena herramienta y fácil de utilizar y necesaria para el trabajo de ductos de HVAC ## Features - Air Duct Calculator - Equal Friction Method - Duct Sizing ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B006XIQ7DM | | Best Sellers Rank | #44,496 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,155 in HVAC | | Brand | HVACCHARTS | | Calculator Type | Air Duct Sizing | | Customer Reviews | 4.6 4.6 out of 5 stars (941) | | 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 | ## Product Details - **Brand:** HVACCHARTS - **Calculator Type:** Air Duct Sizing - **Material:** Other - **Power Source:** Battery Powered - **Screen Size:** 4 Inches ## Images ![Air Duct Sizing Calculator - Image 1](https://m.media-amazon.com/images/I/915Uh0HFT8L.jpg) ## Questions & Answers **Q: Does the problem with sticker placement still exist?** A: No. Product identification stickers are easy peel removable labels. Labels can be removed with little effort. **Q: Would this be the appropriate calculator for flex ducting? It says round but I don't know if that's metal or flex.** A: This calculator is not for flex ducting. Flex ducting has a different friction loss and varies by manufacturer so there is no universal calculator that works for all flex ducting. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Is as described *by R***N on March 26, 2026* Fast shipping is as described ### ⭐⭐⭐⭐⭐ Review *by A***Y on August 15, 2025* Súper buena herramienta y fácil de utilizar y necesaria para el trabajo de ductos de HVAC ### ⭐⭐⭐⭐⭐ Good quality. *by K***K on April 30, 2023* Perfect air duct slide calculator. I removed the stick-on bar code the first day , and it peeled off cleanly. ## Frequently Bought Together - Air Duct Sizing Calculator - REVISED AND UPDATED! HVAC Tables, Equations & Rules of Thumb Quick-Card - Trane TD1 Ductulator with Sleeve, Duct Sizing Calculator --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.in/products/63878322-air-duct-sizing-calculator](https://www.desertcart.in/products/63878322-air-duct-sizing-calculator) --- *Product available on Desertcart India* *Store origin: IN* *Last updated: 2026-05-06*