how do i stick this to my air con? its 125mm connector on the air con but the window and pipe is 150mm and threaded, but cant find a threaded version!

I don’t see anything in the Kair range that solves your problem. The 150 -125mm reducer is just slip-on and it worked fine in my situation. Does the Air-con manufacturer have a fixing to take you from thread to smooth or technical department you can approach for advice? If all else fails You could try to make a connector from flexible hose and fasten with glue and large jubilee clips. Sorry I can’t be more help.

How is this fixed to the other pipe? Does it need a jubilee clip and if so, is it sufficent to fix it in place?

This is more designed to reduce the size of the fitting on a fan and isn't designed to put two pipes together. With that in mind, to make it work for that, both of your pipes would need to be an adequate size to fit over both sizes of the reducer and a jubilee clip would suffice to hold it in place.

My bathroom extractor fan is 100mm but the ducting is 110mm. This reducer seems to be the ideal solution to remove the gap - is it?

It is, although this is designed to fit ducting so you may need a short sleeve of 100mm ducting between the reducer and your fan.

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Kair Ducting Reducer 150mm to 125mm - 6 to 5 inch Duct Pipe Reduction Connector for Extract Fans and Ventilation Units

Product ID: 51940328

Details

Brand
Kair
Colour
White
Connector type
Coupling
Item dimensions L x W x H
15.5 x 15.5 x
Item weight
0.09 Pounds
Material
ABS Plastic

📏150mm to 125mm precision fit

🔄Universal compatibility with Kair SYS-125 & SYS-150

⚙️Durable ABS plastic build

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€ 19.50

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Upgrade your airflow game with precision and style!

ROBUST ABS CONSTRUCTION - Engineered from high-quality ABS plastic for long-lasting durability and reliability.
PLUG PLAY INSTALLATION - Simple, secure fitting with female and male spigots ensures quick setup without hassle.
SEAMLESS SIZE TRANSITION - Effortlessly converts 6-inch to 5-inch ducting for versatile ventilation setups.
WIDE SYSTEM COMPATIBILITY - Perfectly pairs with Kair’s extensive SYS-125 & SYS-150 ducting ranges for a flawless fit.
OPTIMIZED AIRFLOW EFFICIENCY - Designed to maintain optimal airflow between different duct sizes, reducing noise and resistance.

The Kair Ducting Reducer 150mm to 125mm is a high-quality ABS plastic connector designed to seamlessly reduce duct pipe sizes from 6 to 5 inches. Compatible with Kair’s SYS-125 and SYS-150 systems, it ensures efficient airflow for extract fans, ventilation units, and household appliances like tumble dryers and kitchen hoods. Lightweight and easy to install, it’s a must-have for professional-grade ventilation solutions.

Specifications

ASIN	B004X4SXBM
Best Sellers Rank	3,263 in DIY & Tools ( See Top 100 in DIY & Tools ) 3 in Ducting
Brand	Kair
Colour	White
Connector Type	Coupling, Reducer
Country of Origin	United Kingdom
Customer Reviews	4.5 4.5 out of 5 stars (2,615)
Item Dimensions	15.5 x 15.5 x 6 centimetres
Item Weight	0.09 Pounds
Manufacturer	Kair
Material	ABS Plastic
Number of Pieces	1
Part Number	DUCVKC619
Size	150mm to 125mm
Thread Size	150mm, 125mm
Thread Type	UN
Unit Count	1.0 count

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