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 200mm to 150mm Round Duct Reducer

Product ID: 52825005

Details

Brand
Kair
Colour
White
Connector type
Reducer
Exterior finish
Plastic
Item weight
70 Grams
Material
ABS Plastic

📏200mm to 150mm precision fit

🔄Seamless duct system compatibility

⚙️Durable ABS plastic build

S$28

Duties & taxes included

In stock

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Description

🔧 Connect with confidence — the perfect fit for your airflow needs!

OPTIMIZED AIRFLOW - Designed to maintain efficient airflow between different duct sizes, reducing noise and resistance.
LIGHTWEIGHT YET ROBUST - Crafted from durable ABS plastic weighing just 70g for easy installation and lasting performance.
MULTI APPLICATION READY - Ideal for tumble dryers, extractor fans, hydroponics, and kitchen ventilation—upgrade your space instantly.
UNIVERSAL COMPATIBILITY - Works flawlessly with Kair SYS-200 & SYS-150 ranges plus standard ducting systems.
EFFORTLESS SIZE TRANSITION - Smoothly adapts 8-inch to 6-inch ducting for versatile ventilation setups.

The Kair Ducting Reducer (200mm to 150mm) is a lightweight, durable ABS plastic adaptor designed to seamlessly connect 8-inch and 6-inch ducting systems. Compatible with Kair’s SYS-200 and SYS-150 ranges, it ensures efficient airflow for extractor fans, tumble dryers, kitchen hoods, and more, making it an essential upgrade for professional-grade ventilation setups.

Specifications

ASIN	B004X4SWEU
Best Sellers Rank	4,830 in DIY & Tools ( See Top 100 in DIY & Tools ) 10 in Ducting
Brand	Kair
Colour	White
Connector Type	Reducer
Country of Origin	United Kingdom
Customer Reviews	4.5 4.5 out of 5 stars (2,631)
Exterior Finish	Plastic
Item Highlight	Fits over fittings (bends etc), For dryer vents and cooker hoods and extractor fans, Suitable for grow tents and hydroponics
Item Weight	70 Grams
Manufacturer	Kair
Material	ABS Plastic
Number of Packs	1
Number of Pieces	1
Part Number	DUCVKC436
Set Name	False
Size	200mm to 150mm
Thread Size	200mm to 150mm
Thread Type	UN

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