--- product_id: 48320010 title: "100mm In-line Extractor Fan Vent Back Draught Shutter With One Spring And Two Flaps" brand: "manrose" price: "AED 71" currency: AED in_stock: true reviews_count: 11 category: "Manrose" url: https://www.desertcart.ae/products/48320010-100mm-in-line-extractor-fan-vent-back-draught-shutter-one store_origin: AE region: United Arab Emirates --- # 100mm blade length Dual flap with spring action PVC durable material 100mm In-line Extractor Fan Vent Back Draught Shutter With One Spring And Two Flaps **Brand:** manrose **Price:** AED 71 **Availability:** βœ… In Stock ## Summary > πŸš«β„οΈ Stop cold drafts, start smart airflow! ## Quick Answers - **What is this?** 100mm In-line Extractor Fan Vent Back Draught Shutter With One Spring And Two Flaps by manrose - **How much does it cost?** AED 71 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ae](https://www.desertcart.ae/products/48320010-100mm-in-line-extractor-fan-vent-back-draught-shutter-one) ## Best For - manrose enthusiasts ## Why This Product - Trusted manrose brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Effortless Retrofit:** Ideal for horizontal pipe runs with easy push-fit installation - β€’ **Lightweight PVC Build:** Corrosion-resistant and maintenance-free - β€’ **Precision 100mm Blade:** Optimized size for seamless 4-inch duct fit - β€’ **Silent Dual-Flap Design:** Foam-cushioned vanes eliminate noisy clatter - β€’ **Smart Backdraught Prevention:** Spring-loaded flaps block cold air when fan is off ## Overview The Manrose 100mm In-line Extractor Fan Vent Back Draught Shutter features a lightweight, durable PVC construction with dual foam-cushioned flaps and a spring mechanism to prevent backdraughts in 4-inch duct systems. Designed primarily for horizontal installations, it ensures quiet, efficient airflow control and easy retrofit compatibility with existing extractor fans, making it a maintenance-free solution to unwanted cold air infiltration. ## Description Product description Material: PVC. In-line back draught shutter. Safety Warning Please read all product packaging literature and product labels before use. Review: Stops backdraughts as expected - Having an extraction system in my bathroom I was suffering cold air entering during windy times when the fan was not running. Sadly my fan did not have a non return valve built in so a retrofit unit was the solution. This unit is designed to be a push fit to the inside diameter of 4 inch rigid plastic pipe. In my installation like many others I simply have 4" flexible pipe fitted onto the outlet pipe manifolds of the extractor fan. Therefore this unit is not sized to push inside or outside the fan manifolds as standard so a little adaption is required that may be outside the ability of anyone without suitable tools. I filed a slight bevel to the outside of this unit and then using a Dremmel and sanding tip I sanded a slight bevel inside the fan manifold so the unit just slid inside enough to be secure and taped up with duct tape to be sure. The flexible duct did fit over the unit and was again held secure and sealed with duct tape and all now works well. Some people have made note of the single spring which lightly holds the vanes closed perhaps being too weak. I would point out the design of this shutter is meant to be light so that it does not reduce the fan output force which is usually not that strong especially if it is in longer runs of pipework. If the fan is not running and an incoming draught is present the spring will be strong enough to ensure the vanes move closed. Of additional note, the vanes have small pieces of foam to cushion the closing and because there is no plastic on plastic contact this helps to keep the action quiet It may seem such a simple plastic device is expensive but it solves the backdraught problem and is maintenance free. Although I did not see it specified, I would suggest this unit is best installed in horizontal pipe runs, Vertical sections may have too much gravitational effect to work well without reducing fan output. Review: Useless out of the box but perfect with a bit of adjustment. - As others have said the spring doesn't have the tension on it to close the flaps. I was going to return but noticed the spring was removable on further inspection. Put 2 turns anticlockwise on the spring to give it some tension and it now functions perfectly. ## Features - Material: PVC. - In-line back draught shutter. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00A50NDEU | | Best Sellers Rank | 14,140 in DIY & Tools ( See Top 100 in DIY & Tools ) 28 in Ducting | | Blade Length | 100 Millimetres | | Blade Material | Plastic | | Brand Name | Manrose | | Collection Name | Autumn-Winter 19 | | Colour | White | | Control Method | Touch | | Controller Type | Button Control | | Customer Reviews | 4.0 4.0 out of 5 stars (1,946) | | Electric Fan Design | Exhaust Fan | | Finish Type | Powder Coated | | Included Components | Spring | | Indoor Outdoor Usage | Indoor | | Is Product Cordless | No | | Item Dimensions D x W x H | 5D x 5W x 3H centimetres | | Item Weight | 0.05 Kilograms | | Manufacturer | Manrose | | Material | Polyvinyl Chloride | | Model Name | 473107-STX | | Model Number | 473107-STX | | Mounting Type | Wall Mount | | Number of Power Levels | 1 | | Power Source | Corded Electric | | Recommended Uses For Product | Exhausting | | Reusability | Reusable | | Room Type | Bathroom, Kitchen | | Special Features | Remote Controlled | | Style | Modern | | Switch Type | Electronic Touch Controls | | Theme | Modern | | UPC | 790295881476 700254111667 798256115943 | | Unit Count | 1.0 count | ## Product Details - **Brand:** Manrose - **Colour:** White - **Electric fan design:** Exhaust Fan - **Mounting type:** Wall Mount - **Power source:** Corded Electric - **Product dimensions:** 5D x 5W x 3H centimetres - **Recommended uses for product:** Exhausting - **Room type:** Bathroom, Kitchen - **Special feature:** Remote Controlled - **Style:** Modern ## Images ![100mm In-line Extractor Fan Vent Back Draught Shutter With One Spring And Two Flaps - Image 1](https://m.media-amazon.com/images/I/61CIrC0ZzrL.jpg) ## Questions & Answers **Q: I have a bathroom with in-line fan above the ceiling ducting to to the roof.. I am installing an en-suite next door. Can I link into the existing fan** A: This is an old question but is just as relevant today. I asked the manufacturer of my extractor fan the same question, and they said that air will always take the easiest route, which in most cases will be to push moist air from the first bathroom into the second bathroom. Also the ducting must be insulated to stop warm moist air from condensing in the loft void and causing water to run back down into the fan. The maximum length of ducting should also be checked with the manufacturer, for an Envirovent Silent Design 100 it is preferably 1m to 1.5m (otherwise the air resistance is too high for the fan to be sufficiently effective). Fitting the device in this listing may stop the air from going down into the second bathroom, but I would still be concerned about the air condensing. Better to have separate ducting if possible I would think. **Q: How effective is this at stopping draughts once in the closed position?** A: I didn't notice any draughts after installing. Its certainly a big improvement on the standard in line fan kits which only have a permanently open louvre therefore a constant back draught and leak your heated air, which is money out the window! It would be better if it had some seal strips to give a good seal when the flaps are closed. I added a thin strip of self adhesive foam to do this, but make sure it doesn't stop the flaps closing. Spring pressure is very light so be absolutely sure you install it level and horizontal as the instructions, to ensure flaps close properly. I think these give a much better seal than a wall fan with built-in or wall mounted flap Louvre which flap in the lightest of winds. I used the fan kit supplied Louvre as well with a sheet of insect mesh to give additional protection against wind. **Q: Will this fit directly onto the outlet of the fan (the plastic cylinder) or does it have connect to flexi ducting?** A: Hi Depends on the make, the in-line fan unit used was a Vent Axia type, managed to fit to the outlet side of the unit by making a adapter, chopping down a piece of round white pipe & round white channel connector purchased from Screwfix for about Β£3 to Β£4 total, found in the ducting/ventilation bit. Just mastic together and it added about 6 inches. If you do not have the room, the other method used was to grind away slightly a chamfer on the fan itself and glueing directly and by using a small Dremel with a grinding attachment. Both worked however the first method was easier to achieve and hope this helps. The initial problem it is made by Manroe & not Vent AXIA and compatible issues. But would recommend fitting to the fan itself as it would provide a stable and level environment for the shutter to operate correctly. Hope this helps, regards Peter **Q: My extractor fan is in the bathroom ceiling. will the draught shutter work ok if fitted to ducting directly above the fan looking upwards to the roof.** A: Hi. Its recommended to be mounted so the flaps work on the horizontal. Mounting it vertically would require the fan to be strong enough to lift the flaps upwards. The spring is very poor, and not relevant for the direction you want to fit this anyway as its removable, the flaps are lightweight and flimsy, so it might work. Depends on how strong your fan is and would have to be mounted right behind the fan unit. This also will not stop the draught, just slow it right down, as there are holes in the flaps. If the ducting is fairly short you could mount this correctly by putting it just before the exit, behind the grill, assuming it vents out the side of a wall. Personally I think its a rubbish product. It could be so better engineered. Thing is, whats the alternative? Im not aware of another product for doing this job. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Stops backdraughts as expected *by S***H on 25 December 2024* Having an extraction system in my bathroom I was suffering cold air entering during windy times when the fan was not running. Sadly my fan did not have a non return valve built in so a retrofit unit was the solution. This unit is designed to be a push fit to the inside diameter of 4 inch rigid plastic pipe. In my installation like many others I simply have 4" flexible pipe fitted onto the outlet pipe manifolds of the extractor fan. Therefore this unit is not sized to push inside or outside the fan manifolds as standard so a little adaption is required that may be outside the ability of anyone without suitable tools. I filed a slight bevel to the outside of this unit and then using a Dremmel and sanding tip I sanded a slight bevel inside the fan manifold so the unit just slid inside enough to be secure and taped up with duct tape to be sure. The flexible duct did fit over the unit and was again held secure and sealed with duct tape and all now works well. Some people have made note of the single spring which lightly holds the vanes closed perhaps being too weak. I would point out the design of this shutter is meant to be light so that it does not reduce the fan output force which is usually not that strong especially if it is in longer runs of pipework. If the fan is not running and an incoming draught is present the spring will be strong enough to ensure the vanes move closed. Of additional note, the vanes have small pieces of foam to cushion the closing and because there is no plastic on plastic contact this helps to keep the action quiet It may seem such a simple plastic device is expensive but it solves the backdraught problem and is maintenance free. Although I did not see it specified, I would suggest this unit is best installed in horizontal pipe runs, Vertical sections may have too much gravitational effect to work well without reducing fan output. ### ⭐⭐⭐⭐ Useless out of the box but perfect with a bit of adjustment. *by S***R on 8 April 2026* As others have said the spring doesn't have the tension on it to close the flaps. I was going to return but noticed the spring was removable on further inspection. Put 2 turns anticlockwise on the spring to give it some tension and it now functions perfectly. ### ⭐⭐⭐⭐⭐ Exactly what I wanted *by E***T on 26 October 2024* Works fine. Ignore the comments about the spring being too weak. It’s not supposed to close on its own. It opens fully when the fan is on and partially closes when the fan turns off. It then closes fully if there is a draught. This is how it’s designed to work. It’s fitted with foam on the back of the flaps to stop them rattling which seems to work fine too. ## Frequently Bought Together - 100mm In-line Extractor Fan Vent Back Draught Shutter With One Spring And Two Flaps - TUPARKA 4 Pack Large Size Metal Hose Clips 91-114 mm Adjustable Ducting Clamps for Securing Hoses and Pipes Tube - Manrose, MF100T, black --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ae/products/48320010-100mm-in-line-extractor-fan-vent-back-draught-shutter-one](https://www.desertcart.ae/products/48320010-100mm-in-line-extractor-fan-vent-back-draught-shutter-one) --- *Product available on Desertcart United Arab Emirates* *Store origin: AE* *Last updated: 2026-05-31*