4in Sewer Pipe Blast Gate

A remix of @Skandragon_9741's Blast Gates, that gave a perfect starting point for this.  

Modified to provide a slip fit for 4 inch common US PVC sewer pipe, with a positive stop for facilitation of aluminum ducting tape to seal the joint.

Print 2 of the main blast gates here if you want to have both your entry and exit points be sewer pipe attachments, or one of these and one from the original project to adapt to whatever ductwork you need.

Included are the original unmodified 4in Gate Spacer models, as my remix did not change any spacing or the required bolts necessary.

Included is a DXF of the file for the gate slider that I utilized and cut out of 1/8" or 3mm MDF on the laser cutter.

Also included are simple pull handles for the gate slider to provide a grip for opening and closing the gates, as well as a positive stop for the sliding.  Simple CA glue or epoxy to hold in place.

Positive stop, slip-fit for 4in sewer pipe, to provide the proper ledge for sealing the joint with duct tape.