
FIT GETS DECIDED ON PAPER BEFORE IT GETS DECIDED ON SITE
Only have a tape measure, a photo, and an opening no drawing shows?
A fitting is only as good as the measurements it's built from. These guides show you how to measure, what to tell us about the site, and who's responsible if a part doesn't fit.
Numbers first, metal second.

Start Here With How to Measure Ductwork for a Custom Fitting →
The guide shows you the three measurements to take and how to label each one. It also covers what a curb adapter needs from both units, and when it's better to have us measure on site.
Once the numbers are right, scope, site access, and responsibility decide whether the part goes up on the day you planned.

Three ways to buy the same fitting come with three different bills. See what each scope includes, what it leaves to your installers, and how to say which one you want.

An install price depends on what the installers find when they arrive. Learn which site details to mention up front, from parking and lifting to working hours.

When a part arrives and won't line up, the first question is whose number it was built to. See how customer-supplied and field-verified dimensions split the responsibility.

A finished order still has to reach the right floor at the right time. On larger orders, plan the delivery window, the unloading, and how each piece is labelled.

If your measurements are ready, send them with your photos or sketch and we'll say what's still missing. For standard ductwork and fittings, WebDuct prices them instantly once your company has an account.
Sending a complete request has its own guides in Quote-Ready Resources, and the import question lives in Local Fabrication vs Imported Parts. The rest of the library is in the Spec Room.