FS16 – START COLLAR

A 16-inch round start collar used to connect round ductwork to a rectangular plenum box. The crimped end slides into standard round duct, and the flat flange mounts to the plenum with screws or duct tape. Used in new duct installations and adding supply runs to existing systems.

Specs: 16″ round, galvanized steel, crimped end, for metal or ductboard plenums

Replaces: 52516, FS16

Fits: Standard 16″ round ductwork connecting to rectangular plenums in residential and light commercial HVAC systems

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Specs

• TypeStart collar
• Duct size16" round
• Mounts toPlenum or trunk sheet metal
• SealingMastic the flange to the plenum

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• FS16
• MM16-INCH

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

Fits these models

• SPEEDI-COLLARSC-16

What is a start collar?

The fitting that starts a branch run off a plenum or a trunk. It mounts to the sheet metal and gives the flex or rigid duct something to connect to.

What size do I need?

Match the branch duct it is feeding. Do not start a 7 inch run on a 6 inch collar to make it fit - that restriction stays in the system forever.

Do I need a damper on it too?

If you want to balance that room, yes - either a damper built into the collar or one installed right after it. Balancing at the takeoff works; choking the register does not.

How do I install it?

Cut the opening, bend the tabs over inside the plenum, screw it down, then seal the flange to the sheet metal with mastic. An unsealed collar leaks conditioned air straight into the attic.

Do you stock all the sizes?

5 inch through 20 inch on the shelf at 10226 Plano Rd, Suite 104 in Dallas.