Gray North 4″ Start Collar 6″ Long Crimped w/ Flange 4-313FG-1

4″ Start Collar w/ Flange – 6″ Long – MFG# 4-313FG-1

This 4-inch galvanized steel start collar is designed for creating secure branch take-offs from trunk lines in residential and commercial HVAC duct systems.

The 6-inch extended length provides deeper trunk penetration for stability, while the crimped end allows easy attachment to 4″ round rigid or flexible duct.

The serrated ring design (no pre-drilled holes) provides flexibility for installers who prefer custom fastening locations.

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Key Features & Benefits:

✔ 4″ round duct size
✔ 6″ long extended collar
✔ Crimped end for duct insertion
✔ Serrated locking ring
✔ Flanged base for secure trunk attachment
✔ No pre-drilled holes (installer flexibility)
✔ Galvanized steel construction

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Ideal Applications:

• Supply branch take-offs

• Bathroom exhaust duct starts

• Dryer vent transitions

• Residential HVAC trunk systems

• Retrofit or new construction installs

Pairs well with:

• 4″ insulated flex duct

• 4″ rigid pipe

• Worm gear clamps

• Sheet metal screws

• Foil HVAC tape

Built for professional HVAC installers needing durable, reliable start collars for 4″ duct runs.

Product details

Part / SKU	4-313FG-1

Package includes

• Gray North 4" Start Collar 6" Long Crimped w/ Flange 4-313FG-1

Included components and any stated pack quantity are as described in this listing. Optional accessories shown separately are sold separately unless expressly included above.