Ventis Class-A Adapters Screw Pack

You Must Drill Holes

Use to attach directly to a Class-A connectors or flue extensions in step 2. Use these screws if you choose not to use the Standard Chimney Adapter. Drill three evenly spaced holes 1" down from the top edge of the pipe with a 3/16" drill bit. Then fasten with these longer screws. 

Screws are 1 1/4" long.