Rectangular straight tap

Before you start

• Confirm branch size, location, orientation, airflow direction, and the approved tap type before cutting the main.
• Check the main duct for seams, reinforcement, joints, access doors, hangers, and other taps near the proposed opening.
• Lay out the full opening and tap flange, then verify the branch route from the tap to the next fitting.
• Support the cookie before the final cut so it cannot fall into the duct or onto anyone below.

Lay it out

1. Mark the tap opening from the approved branch centerline.
2. Keep the opening clear of main-duct seams, joints, reinforcement, and hangers.
3. Square the tap throat to the main-duct reference, not to a crooked ceiling line.

Set and support it

1. Support the main duct before cutting if the opening or tap weight could distort the face.
2. Install or mark the first branch support before connecting the branch.
3. Clamp the tap flush and square before fastening.

Make the connection

1. 1

   Cut the opening cleanly and hold the cookie until the final cut releases it.

2. 2

   Remove the cookie and deburr the opening.

3. 3

   Set the tap into the opening and align the throat to the branch centerline.

4. 4

   Square the tap from the main-duct reference.

5. 5

   Clamp the tap flush so the flange does not ride on a bellied duct face.

6. 6

   Install approved fasteners evenly around the flange.

7. 7

   Seal the tap flange continuously after the mechanical connection is complete.

8. 8

   Connect and support the branch without pulling the tap out of square.