Air Duct Sizing Calculator

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 front side 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. Picture shows front and back.

Order Processing: After your payment is authorized and verified, we will start processing your order and this process can take from 1 to 2 business days, so please be patient with us. If we are unable to process your order due to inaccurate or incomplete payment or incorrect address information, your order processing may be delayed.

Carrier: UPS/FedEx/USPS. Delivery Timescale: More than 90% of orders arrive in 10 business days after despatch.

FREE RETURNS on all orders!
The following conditions must be met:

1. Items must be returned within 30 days after the purchase date.
2. Items must be unworn, undamaged and in original packaging.