Why do these look remarkably different both in form and in length ?

I do not really know what you are referencing.... what you received, I presume, does not match what is pictured?

What’s the total length of the 6” TO 4” reducer?

don't know. I have the 8"to 6" reducer. 7 1/2"

What are the internal diameters of the 10" to 6" reducer?

The product is 10 x 6 reducer. The connecting vent will connect on outside of unit. Oneside 10 inch other 6 inch.

Can it be used to increase from 6" to 8"?

Yes. But it won't work as in either direction. If you want to go from 6 to 8" you would have to crimp (or have a sheet metal worker crimp) the big end. If you want to go down from 8 to 6", then crimp the small end. If this isn't clear to you, then go to a shop that sells lengths of sheet metal ducting and take note how one end of each piece is krimped. Take note that the gas flowing through the tube or duct flows toward the crimped end.

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🔧 Upgrade your airflow game with the ultimate duct reducer!

BUILT TO LAST - Heavy-duty galvanized steel ensures durability and rust resistance for long-term HVAC performance.
COMPACT LIGHTWEIGHT - At just 7.2 ounces and compact dimensions, it’s easy to carry and install in tight spaces.
PERFECT FIT PRECISION - Seamlessly reduces duct size from 6 inches to 4 inches, optimizing airflow without leaks.
EFFORTLESS INSTALLATION - Redesigned for easier handling and faster, more secure duct connections—save time on every job.
VERSATILE COMPATIBILITY - Ideal-Air’s reducer fits a wide range of HVAC systems, making it your go-to solution for duct transitions.

The Ideal-Air Duct Reducer (6 in to 4 in) is a heavy-duty, galvanized steel connector designed for secure, leak-free transitions in HVAC ducting. Engineered for durability and ease of installation, it fits a variety of systems and ensures optimized airflow with a compact, lightweight design.

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Size	6 to 4 Inch
Material	Galvanized Steel
Brand	Ideal-Air
Color	5.9
Item dimensions L x W x H	6.1 x 7 x 5.9 inches
Connector Type	Reducer
Number of Pieces	1
Global Trade Identification Number	00870883009540
Manufacturer	Sunlight Supply Inc.
UPC	870883009540
Part Number	736210
Item Weight	7.2 ounces
Product Dimensions	6.1 x 7 x 5.9 inches
Item model number	736210
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Batteries Required?	No

Duct Reducer 6 in - 4 in (24/Cs)

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