The 'Manual-S' is for equipment specs on projects. Feel free to download it if you need it for a job or just want to look more professional to your client.

This file was provided by the ACCA.

The 'Manual-D' is for ductwork design. If you need it for a job or just want to look more professional, feel free to download. 

This file was provided by the ACCA.

The 'Manual-J' is for load calculations on homes and other projects. You should be doing a load calculation on every install and replacement you do. There are much easier ways to get this done now, but if you want to do it the old fashioned way, feel free to download this for free.

File provided by the ACCA.