We have new duct calculators available for promotional give-aways! These are sturdy cardboard and pre-punched to go into a three-ring binder. 

An important note: We want to keep these in the hands of folks who are using them to specify SEMCO duct! They are not a cheap give-away that we want to pass out to everyone we have a meeting with.

If you would like to request some Duct Calculators, email me with the information of how many you need and who they're going to.