KNOCKING TIN
Free Resources
Shop Calculators

Duct Sizing Calculator

Size rectangular and round ductwork using the equal friction method — 0.1" WG per 100 ft — with ASHRAE/SMACNA verified data. Includes velocity checks for residential and commercial applications.

ASHRAE / SMACNA / Manual D

Transition Request Form

Mobile-friendly order form for field techs. Enter dimensions and get a real-time 2D drawing and live quote before you call the shop.

Mobile Friendly

Plenum Spec Finder

Look up furnace plenum dimensions by manufacturer and model. Carrier, Trane, Lennox, Goodman, Rheem — all in one place.

Coming Soon

Need Something Fabricated?

K&E Sheet Metal fabricates custom ductwork, transitions, and fittings. Submit a job request directly from the shop site.

K&E Sheet Metal
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