VELUX KFA 100 WW Smoke Detector Sensor
3 Year WarrantyBBA Approval Inspection Testing Certification

£78.13 ex VAT£93.76 inc VAT

3 Year WarrantyBBA Approval Inspection Testing Certification

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  • Additional Information
  • Code: KFA 100 WW
  • Brand: VELUX
  • Estimated Delivery: 3 - 4 Working Days
  • Can't find what you're looking for?
    Please give us a call on 01858 455055
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Velux Window Guide
VELUX Product Codes Guide

A VELUX smoke detector for early fire detection, with visual indication of activation.

Up to 10 smoke detectors can be used with a VELUX control system.

  • Height: 50mm
  • 100mm diameter including the socket

Smoke-ventilation roof windows for sloping roofs with integrated motor are CE-marked in compliance with the European standard for smoke and heat exhaust ventilators EN 12101-2.

The code of your existing VELUX window may differ if it was purchased pre-2014. Please view the Help & Advice tab to see how your old code translates to new codes.

VELUX Window Sizes / Orientation

All VELUX window sizes are listed as width x height. For example, an MK04 window is 78cm wide and 98cm high.

For a visual representation of this, please click here.

VELUX Window Product Codes

The code of your existing VELUX window may differ if it was purchased pre-2014 - these windows generally have a code without the 'K'. To learn how to find your VELUX window code, click here.

And to see how your old code translates to new codes, click here. However, you will need to buy the pre-2014 coded product to match your window.

VELUX Blind Product Codes

VELUX blinds come with side channels which come in two different options. This is reflected in the product code:

  • Product codes ending in ‘S’ - these will have aluminium side channels.
  • Product codes ending in ‘SWL’ - these will have White Line side channels.

Top Hung Windows & Cleaning Mode

Your top hung window may arrive in the Centre Pivot position which is the Cleaning Mode Function, allowing the external pane to be cleaned when the window has been installed. Please click here for instructions on how to switch it to the correct position.

Useful Guides


For advice and FAQs on the VELUX ACTIVE system, please visit the VELUX support pages.

VELUX Standard Flashing Kits

Please note that if you are viewing the installation guide for standard flashing kits, part 5 as numbered in the illustration is pre-attached to the window and is not part of the flashing kit. Part 6 comes within its own box that is positioned above the window in the window box.

Other Advice

Further product data and installation guides can be found in the Technical Information area (where applicable).


For delivery to mainland UK.

How much does delivery cost?

Delivery charges will vary and will depend on the manufacturer, weight, size and delivery location. The cost is automatically calculated when you add items to the shopping basket.

How long will I wait for my delivery?

The estimated delivery times are shown on each product page, we will email you each step of the way to keep you informed. The majority of products can be delivered within 3-5 working days.We will advise you if the delivery period is different from than stated on our website. Please note that, due to Coronavirus, deliveries may take longer than advertised.

Do you offer NEXT DAY delivery?

We currently offer next day delivery on certain brands. If you have a particular item that you require quicker than the guide on our website, please contact our sales team on 01858 455055 during office hours, they will be able to confirm whether a quicker delivery is possible.

What if my delivery doesn't turn up on time?

Please contact our sales office on 01858 455055 or email and we will advise on the status of your order. While we make every effort to ensure orders are delivered by the date required, we cannot guarantee availability from the manufacturer or the manufacturer’s delivery schedules.

Do you offer FREE Delivery if I spend a substantial amount?

Not as standard, we show the delivery charges separate once you go to the checkout so it is clear what you are paying for the products and delivery costs. If you are ordering larger quantities please contact our sales team who will be able to confirm if this is possible.

Do you deliver on Weekends?

Not as standard, our deliveries are made Monday to Friday. If you do need an urgent Saturday delivery please contact our sales team on 01858 455055 during office hours who will be able to confirm. This will incur a premium charge if possible.

Do you deliver to Northern Ireland/Channel Islands/The Scottish Highlands/Isle of Wight?

Some suppliers/couriers will deliver to these areas but not all, please contact our sales team on 01858 455055 or email during office hours for confirmation. If we are able to deliver the product you require, additional transport costs will apply, we will be able to confirm this to you. These additional costs are based on the manufacturer, distributor or courier providing the shipping on our behalf.

Are there separate delivery rules for Republic of Ireland post-Brexit? 

We can deliver to the ROI but will need a customers EORI reference before we can process an order, if you need a delivery to a business address. This is for business addresses only. Please note, any inbound additional customs fees have to be paid by the customer on receipt of delivery, Roof Giant are not liable for these additional costs. 

What should I do when my order arrives?

Please check your order as soon as it arrives to ensure it is as requested, and to check for any damage or items missing. All damages/items missing should be reported to the driver and signed for as damaged/and or missing. Please contact Roof Giant within 24-48 hours with full details to enable us to inform the supplier. 

Orders signed for “unchecked” will be deemed to have been received in good condition with no guarantee of replacement or refund. As soon as the order has been delivered to your requested delivery address, the risk of any damage or loss passes to you.

Do additional charges apply if I am not in to receive the order?

All delivery charges are based on the customer being able to accept the goods, please make sure you are at the delivery address to avoid any additional charges chargeable by the manufacturer, distributor or courier responsible for re-delivery.

What happens if we have a failed delivery? 

Roof Giant will always update you if a delivery date changes. Should the delivery fail because there is no one available to accept the order please note a re-stock and failed delivery charge may apply. Please contact Roof Giant to discuss re-delivery and charges that apply. Please note these are set by the supplier and not Roof Giant therefore will be passed on to you the customer.

What if my delivery doesn't turn up on time?

Due to current issues across the UK logistics and courier network, some deliveries can take longer than normal which is, unfortunately, impacting customers across the UK.

We always aim to deliver on the delivery date we provide and ship goods within the lead times advertised at the time of purchase on our website. These are subject to change due to availability. We cannot accept responsibility for any delays that are outside of our control, provided we deliver the goods within a reasonable period. If we can’t deliver your items within this reasonable period, you have the right to cancel your order for a full refund, including any delivery charges. Some exemptions apply to bespoke or made to order goods.

We cannot accept liability for any personal damages resulting from delays of the goods, including compensation for lost work and exceptional hire charges in relation to delays. We strongly advise all customers to not schedule or start work before they are in receipt of the goods due to the current logistics issues.

Is customer tracking available?

Some of our manufacturers, distributors, couriers can offer this service. Please ask Roof Giant for more information on whether this is available against the goods ordered.

If I order multiple items will I receive just 1 delivery?

If your order consists of more than 1 item you may receive more than one delivery, depending on stock availability some orders maybe split to enable you to avoid delaying the start of your project. We will keep you updated on your order or you can contact Roof Giant directly via phone/email/live chat.

I live on a narrow street with limited access with over hanging trees, will this affect my delivery?

Please confirm any delivery restrictions at the time of order, we will need to ensure any restrictions/extra delivery requirements can be addressed prior to processing.

I have a large order being delivered to kerbside only, do I need to make any additional arrangements to move the goods?

Yes you do, this type of delivery means your goods will be dropped at the kerb therefore you need to make arrangements to move the goods onto your property where is safe to store.

Can I collect from you?

No, not currently. However you may be able to arrange collection from one of our manufacturers/distributors. If you would like to discuss please contact Roof Giant on 01858 455055, or via live chat.

VELUX Returns Policy

DELIVERY: It is the consumer's responsibility to ensure there is site access, have the ability to unload and someone on site to sign for the delivery. The signature is accepted as valid proof of delivery in the right condition. 

Goods that are either damaged or missing in transit must be marked on the delivery driver's paperwork prior to signing for the goods delivered, and reported to Roof Giant within (7) working days of the actual delivery date.

Please do not install VELUX items if you have a query with the product (e.g. if you need to query damage that occurred during transit). If an item is installed there is no guarantee of a refund/replacement.

Faults that were not evident during an inspection upon receipt of goods must be reported to Roof Giant within one (1) month of the delivery date.

To return goods to VELUX, the following conditions must be met:

  1. Goods will only be accepted for return if the condition of both products and packaging allows for resale.
  2. A return fee of £20 per item will apply to all returns. (Please note some VELUX products are sold as 1 system containing multiple windows / flashings. Should the system (or any part of the system) need to be returned the £20 restocking charge will apply to each product).
  3. A return carriage charge of £40 will apply to goods returned from site.
  4. Return fees are in addition to the return carriage charge for goods returned from site to Velux.
  5. Products purchased prior to the commencement of these trading terms are subject to the return policy in place at the time of creating the return, not at the time of purchase.
  6. While awaiting either inspection by VELUX or collection, the consumer shall take all reasonable precautions to prevent any damage to the products (including packaging).
  7. Transport companies acting on behalf of VELUX will only collect the specific items described on the collection note. No other items will be accepted.
  8. It is the consumers responsibility to ensure that the items submitted for return are as described to Roofgiant during all correspondence regarding the return. Any additional costs associated with failure to meet this responsibility may be passed on to the consumer. Roofgiant are not responsible for any extra or incorrect items returned.
  9. Replacement panes (IPL), component parts of packages or any product with code beginning 'SPECIAL' and made for specific customer requirements will not be accepted for returns.
  10. Products to be returned must be advised within 4 months of delivery of goods.
  11. VELUX must be able to inspect and/or collect goods that are to be returned prior to the acceptance of the goods for return.

Example Return

  • Items to be returned: 2 x GGL CK04 2070 roof window and 2 x EDW CK04 0000 flashing
  • Collection point: Site collection
  • Cost: £120 (4 x £20 return fee + £40 return carriage fee)

VELUX refunds process can take up to 30 days to process from point of collection, we will be in touch to confirm the credit as soon as confirmation is received.