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IMPERIAL 4-in to 4-in 32 Gauge Galvanized Steel Round Ductboard Duct Starting Collar

Name: IMPERIAL 4-in to 4-in 32 Gauge Galvanized Steel Round Ductboard Duct Starting Collar
Brand: IMPERIAL
SKU: 1000230177
Price: 6.98 USD
Availability: InStock
Rating: 4.8 (34 reviews)

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4.8

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Wed, Oct 14

43 available

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This Imperial 4-in Duct Board Starting Collar provides a reliable transition from a flat surface to round pipe or insulated flexible duct. Used with duct board or a plenum, this versatile starting collar features extra-long tabs to fit most R6 duct board thicknesses through 1-1/2-in. The collar is easy to install with sheet metal screws for a secure fit (screws sold separately). It is made from 30-gauge galvanized steel for rust resistance and lasting durability, and is suitable for use in most heating, venting and air conditioning applications.

Used to transition from a flat surface to round pipe or insulated flexible duct
For use with duct board, internally lined plenum, or unlined plenum
Features extra-long tabs to fit most R6 duct board thicknesses through 1-1/2-in
Constructed from 30-gauge galvanized steel for durability and rust resistance
Installs with sheet metal screws (not included)

General
Type	Duct starting collar	Package Quantity	1
Material	Galvanized steel	Shape	Round
Sub Type	Ductboard

Dimensions
Diameter End 1 (Inches)	4	Length (Inches)	5
Diameter End 3 (Inches)	0	Width (Inches)	4
Diameter End 2 (Inches)	4	Depth (Inches)	5

Features
Crimped	Yes	Insulated	No
Damper Included	No	Flange Included	Yes
Gauge	32

Certifications
CA Residents: Prop 65 Warning(s)	No	Safety Listing	Not safety listed

Warranty
Warranty	1-year limited

Miscellaneous
UNSPSC	40141900

Check out the Best Selling Duct Transitions & Connectors on Lowes.com

Review

4.8 out of 5

34 Reviews

1 Star

100% Recommend this product

Ratings may include incentivized customer reviews.

34 Customer Reviews

Sort By

Highly functional.

This is a great piece. I connected my flexible dryer vent to one end and on the other end I was able to bend multiple tabs out and screw them to the wall at the exterior dryer vent. I’m very happy with my finished project.

ElizaSteveSeptember 12, 2026
Verified Purchaser

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Ewww you guys made me iiiiiink!

Would Recommend

When you kinda squint this looks like a Blooper, if you're not serenaded by 8-bit flashbacks, what are you doing with your life? Why did he move like that? Like, never in my life have I ever found myself traversing a solvent in such locomotion. Seriously though, nice squiddy.

4to25charactersJune 14, 2026
Verified Purchaser

Was this Review Helpful ?

Well designed

Would Recommend

Works

Lt DanJune 7, 2026
Verified Purchaser

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Easy to use

Would Recommend

Easy to use

JackMay 7, 2026
Verified Purchaser

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Pick up sum sealent

Would Recommend

It was perfect

GeorgieApril 18, 2026
Verified Purchaser

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4 Questions

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My current roof vent for my bathroom exhaust fan doesn't have a collar going from it into the attic, and the duct work is no longer attached. Can I use this to push up inside the roof vent and then attach the duct work to it?

What is the width including the flange?

does this have pre-drilled holes for dampers?

Is this for cutting into existing ductwork in order to add a new line?

IMPERIAL: Featured Videos

COMPARE PRODUCTS

		Name	Current Item IMPERIAL4-in to 4-in 32 Gauge Galvanized Steel Round Ductboard Duct Starting Collar
		Ratings	34
		Diameter End 1 (Inches)	4
		Type	Duct starting collar
		Width (Inches)	4
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