Will this alarm fit on to existing backing plate of a firex 1240c series alarm?

I bought my Kidde alarms to replace existing alarms from a different manufacturer and new backing plates were supplied. However I realised that there was little difference between the backing plates so I just used the ones that were already there. Given you are talking about a firex alarm, I'm sure you'd be ok but you might like to check the manufacturer's website to check.

Are you selling 2 x kf2 or 2 x kf20 ?

The KF2 is discontinued and the newer version is the KF20. You will receive 2x KF20 alarms.

Are these same fittings for firex padc240 ?

Yes they will replace the old Firex model

My alarms are slightly different but need replacing but my wires are different colours mine are blue white and brown is this a problem?

All alarms now have a "Link" wire, they are used to couple up (or link) numbers of alarms together, so if one alarm sounds, all sound. That is what the white wire is used for. If you don't need or want to link alarms, just make safe the white wire with a connector and leave it disconnected. The brown is the permanent live, the Blue is the neutral, both have to be supplied from your mains electric circuit.

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Twin Pack Kidde Firex KF20 Mains Powered Optical Smoke Alarm with 9V Back Up Batteries | KF2 | 4973

Product ID: 50590449

Details

Alarm
Audible
Brand
Kidde
Colour
White
Item weight
500 Grams
Power source
Battery
Sensor type
Photoelectric

⚡Mains-powered with low energy use

🔋9V battery backup included

🔗Interlink up to 23 alarms

₩174508

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Description

🔥 Stay ahead of danger with Kidde’s smart, connected smoke alarms! 🔗

SMART TEST SILENCE - Combined Test/Hush™ button lets you easily check functionality and silence nuisance alarms temporarily.
RELIABLE POWER BACKUP - Stay protected even during power outages with included 9V alkaline battery backup.
CERTIFIED PEACE OF MIND - Complies with UK Building Regulations (Grade D BS 5839, Part 6) ensuring trusted, professional-grade safety.
ENERGY EFFICIENT DESIGN - Lower lifetime running costs thanks to reduced energy consumption compared to previous models.
SEAMLESS HOME WIDE SAFETY - Interlink up to 23 Kidde alarms for instant, synchronized alerts across your entire home.

The Kidde Firex KF20 is a mains-powered optical smoke alarm featuring interlink capability with up to 23 other Kidde alarms, ensuring whole-home alert synchronization. It includes a 9V alkaline battery backup for uninterrupted protection, reduced energy consumption for cost efficiency, and a combined Test/Hush™ button for easy maintenance. Certified to UK Building Regulations, this alarm is ideal for escape routes and living areas, delivering reliable, professional-grade fire safety.

Specifications

ASIN	B00LGX1TSC
Alarm	Audible
Best Sellers Rank	4,105 in DIY & Tools ( See Top 100 in DIY & Tools ) 24 in Smoke Alarms
Brand	Kidde
Colour	White
Customer Reviews	4.6 out of 5 stars 965 Reviews
Item Part Number	KF20 KF2 4973
Item Weight	500 Grams
Item weight	500 Grams
Model Number	KF2 4973
Part Number	KF2 4973
Power source	Battery Powered
Product Style	Classic
Sensor Type	Photoelectric
Style	Classic
UPC	799441946892

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₩174508

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

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