Online Dictionary: Sheet Metal
Sheet metal is simply metal formed into thin and flat pieces. Learn all about the process of creating sheet metal

Smacna
Sheet metal and air conditioning contractors national association

Snips Magazine
Online Buyers guide, news and events in the sheet metal industry

Gibson Heating and Cooling
Heating and Cooling products

Residential Air Duct Sizer and Velocity Calculator
Calculate the size of your ducts and returns

Metalaire diffusers
Metalaire is one of the leading world wide suppliers of commercial air distribution products

Hart & Cooley
Hart & Cooley Inc. is a major supplier to the HVAC industry