--- product_id: 48826074 title: "Kair White 100mm Gravity Wall Vent Grille - 99.5mm / 4 Inch Round Rear Spigot & 155mm Front Cover - Backdraught Prevention Shutter Flaps" brand: "kair" price: "฿3542" currency: THB in_stock: true reviews_count: 13 category: "Kair" url: https://www.desertcart.co.th/products/48826074-kair-white-100mm-gravity-wall-vent-grille-99-5mm-4 store_origin: TH region: Thailand --- # 7329.6 cm³/s airflow capacity Easy push-fit installation Automatic non-return shutter flaps Kair White 100mm Gravity Wall Vent Grille - 99.5mm / 4 Inch Round Rear Spigot & 155mm Front Cover - Backdraught Prevention Shutter Flaps **Brand:** kair **Price:** ฿3542 **Availability:** ✅ In Stock ## Summary > 🛠️ Upgrade your airflow game with effortless, reliable ventilation! ## Quick Answers - **What is this?** Kair White 100mm Gravity Wall Vent Grille - 99.5mm / 4 Inch Round Rear Spigot & 155mm Front Cover - Backdraught Prevention Shutter Flaps by kair - **How much does it cost?** ฿3542 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/48826074-kair-white-100mm-gravity-wall-vent-grille-99-5mm-4) ## Best For - kair enthusiasts ## Why This Product - Trusted kair brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Seamless Integration:** Designed with a 4 inch (100mm) rear spigot for quick, adapter-free connection to standard ducting. - • **Effortless Airflow Control:** Gravity shutters open with airflow and close automatically to block draughts and pests. - • **Regulation-Ready Performance:** Complies with Part F Building Regulations and tested by BSRIA/BRE for reliable ventilation efficiency. - • **Versatile Ventilation Solution:** Ideal for bathrooms, kitchens, HVAC, hydroponics, and whole-house ventilation systems. - • **Durable Weather-Resistant Build:** Made from sturdy polypropylene with a clean white finish that withstands outdoor conditions. ## Overview The Kair White 100mm Gravity Wall Vent Grille features a 4 inch rear spigot and 155mm front cover, engineered with automatic non-return shutter flaps that prevent backdraughts, odors, and pests. With a high airflow capacity of 7329.6 cm³/s and easy push-fit installation, it’s a durable, regulation-compliant ventilation solution perfect for residential and commercial ducting needs. ## Description Free delivery and returns on all eligible orders. Shop Kair White 100mm Gravity Wall Vent Grille - 99.5mm / 4 Inch Round Rear Spigot & 155mm Front Cover - Backdraught Prevention Shutter Flaps. Review: Well-designed and reliable external vent with effective shutters - This Kair gravity grille is a solid choice for anyone needing a dependable external air vent. The 183mm size fits perfectly with standard 150mm (6 inch) ducting, and the rear spigot makes installation straightforward—no fuss, no need for extra adapters. The build quality is excellent, with sturdy plastic that feels like it will last well outdoors. The gravity shutters work flawlessly, opening easily with airflow and closing smoothly to keep out draughts, pests, and rain when not in use. The beige colour blends in nicely with exterior walls and doesn’t look out of place. Overall, it’s a practical, effective solution for ventilation that does exactly what it’s supposed to, without any hassle. Highly recommended if you’re upgrading extractor fans or installing a new vent—good value and reliable performance. Review: Well-made external vent grille with a neat finish - This gravity grille is good quality and feels well made. The white finish looks clean and tidy once installed, and it fits perfectly with 150mm (6 inch) ducting. The rear spigot connects securely and lines up nicely. The flap operates smoothly and helps prevent draughts when not in use. Installation was straightforward and the grille feels solid rather than flimsy. Overall, a reliable and well-designed external vent that does exactly what it’s meant to do. ## Features - White Plastic Ducting Air Inlet / Air Outlet with Gravity Shutters. 155mm x 155mm external dimension with 4 inch / 100mm round male rear spigot on the back of the grille for indoor or outdoor use. - Non-return shutter flaps close automatically when not in use. Stops unpleasant odours, noises, or draughts flowing back through your duct. Gravity flap - no need for springs that could break. - Easy to install, just push-fit duct and fittings together. Perfectly suited Bathroom or Kitchen extractor fan, Hydroponics fan, or In-Line Extract Fan. - This grille can be used as a part of a long ductwork run for a variety of purposes including whole house ventilation, passive ventilation, positive input, air conditioning, HVAC, and Heat Recovery Systems. - Suitable to use in compliance with Part F Building Regulations. Airflow performance independently tested by BSRIA or BRE. Free Air: 7200mm2. Static Pressure Drop in Pascals: 15 l/s = 10.94 Pa - 30 l/s = 18.59 Pa - 60 l/s = 24.21 Pa. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B004X4RVUQ | | Air Flow Capacity | 7329.6 Cubic Centimetres Per Second | | Best Sellers Rank | 1,179 in DIY & Tools ( See Top 100 in DIY & Tools ) 3 in Registers, Grilles & Vents | | Brand | Kair | | Colour | White | | Controls Type | Manual | | CountryOfOrigin | United Kingdom | | Customer Reviews | 4.5 4.5 out of 5 stars (4,840) | | Filter Type | Filterless | | Finish Type | Painted | | Global Trade Identification Number | 05060272540890 | | IncludedComponents | Non-return shutter flaps, 4 inch / 100mm round male spigot | | Item Dimensions D x W x H | 10.2D x 39.4W x 15.5H centimetres | | Item Form | Pyramid | | Item Weight | 82 g | | Manufacturer | Kair | | MaterialType | Polypropylene (PP) | | Model | SYS-100 | | Mounting Type | Wall Mount | | Number of Speeds | 1 | | SpecialFeatures | Automatic Non-Return Shutters | | Unit Count | 1.0 Count | | Vent Hood Design | Wall Mounted Canopy Hood | | Ventilation Type | ductet | ## Product Details - **Brand:** Kair - **Colour:** White - **Finish type:** Painted - **Product dimensions:** 10.2D x 39.4W x 15.5H centimetres - **Special feature:** Automatic Non-Return Shutters ## Images ![Kair White 100mm Gravity Wall Vent Grille - 99.5mm / 4 Inch Round Rear Spigot & 155mm Front Cover - Backdraught Prevention Shutter Flaps - Image 1](https://m.media-amazon.com/images/I/51fLm0u-8WL.jpg) ## Available Options This product comes in different **Color, Size** options. ## Questions & Answers **Q: Is the 10cm the size of the 'flaps' or the width of the whole unit?** A: the size is not applicable to either of the above , it refers to the size of ducting you can attach to the grill tohere is the actual sizes for the gravity grill 100mm / 10cm Product Type Wall VentHeight (mm) 155Length (mm) 155Width (mm) 40Spigot size (mm) 28 x 96 x 96 **Q: Does anyone know if when the extractor is on are the flaps meant to open up? Mines doesn’t seem to open up at all.** A: Assuming the extractor fan is blowing out through the grille, the flaps should open. How far they open depends on the strength of the air-flow from the fan. **Q: What is the pitch of the fixing holes, looking for 110mm horizontal by 100mm vertical.** A: The fixing holes on this product correspond to the measurement you are looking for 110mm wide between securing holes x 100mm high between securing holes **Q: Has anyone used this on an plastic outdoor keter shed?** A: should be fine with a suitable interface sealant ## Customer Reviews ### ⭐⭐⭐⭐⭐ Well-designed and reliable external vent with effective shutters *by P***L on 17 October 2025* This Kair gravity grille is a solid choice for anyone needing a dependable external air vent. The 183mm size fits perfectly with standard 150mm (6 inch) ducting, and the rear spigot makes installation straightforward—no fuss, no need for extra adapters. The build quality is excellent, with sturdy plastic that feels like it will last well outdoors. The gravity shutters work flawlessly, opening easily with airflow and closing smoothly to keep out draughts, pests, and rain when not in use. The beige colour blends in nicely with exterior walls and doesn’t look out of place. Overall, it’s a practical, effective solution for ventilation that does exactly what it’s supposed to, without any hassle. Highly recommended if you’re upgrading extractor fans or installing a new vent—good value and reliable performance. ### ⭐⭐⭐⭐⭐ Well-made external vent grille with a neat finish *by A***R on 4 January 2026* This gravity grille is good quality and feels well made. The white finish looks clean and tidy once installed, and it fits perfectly with 150mm (6 inch) ducting. The rear spigot connects securely and lines up nicely. The flap operates smoothly and helps prevent draughts when not in use. Installation was straightforward and the grille feels solid rather than flimsy. Overall, a reliable and well-designed external vent that does exactly what it’s meant to do. ### ⭐⭐⭐⭐ Basic cover that looks to be durable. A good fit. *by J***S on 12 March 2018* Overview: Well made, durable ventilation cover. Disclaimer: I don’t know what I’m doing, I really don’t! This is the first ventilation cover I’ve installed. Hopefully if you don’t know what you’re doing either, then this review helps! I also bought this after the initial purchase I made was too big. A reminder to check the sizing - 100mm is the diameter of the insert that goes into the wall. Postage and Packaging: Nice and quick, but the packaging within the amazon box was a polythene bag. This is quickly becoming the norm where there is no commercial packaging included at all. First Impressions: The vent cover is a matt black and as such is not jet black to the eye. Its not grey, but certainly with the lack of shine it displays, then it is certainly not Jet black either. Other than that it seems well made and an appropriate standard. There is nothing else included in the package - no screws or Raul plugs. This isn’t an issue if you are replacing a current vent cover, and not much of an issue with a new install. Design: I’ve already covered the matt nature - and this is down to it being slight textured to the touch. Other than that, it has 3 horizontal slats, as opposed to the 4 that my previous one had. I suspect that the 3 will be slightly more resistant to airflow which may help in wind but other than that I don’t know what relevance it has. Figment and use: The screw holes for my old one were not quite in the same place, so new holes needed to be drilled and new rawl plugs used. Other than that, the holes on the cover allow a little latitude to move it for a precise fitting. Once installed, it pretty much stays there. The biggest negative I’ve read in previous reviews is that the slats move in the wind creating a clacking/banging noise. Its early days, and I suspect it is very dependant on individual houses. If this happens and it is enough to want to go to the effort to solve, I suspect sticking a small gel nub on the back of slats would stop it fine. Longevity: Its a cover. The previous one lasted for a good 14 years since the house was built. I suspect that this should last longer with no issues. However, if it does fail in a short period then as always I will update this review ## Frequently Bought Together - Kair White Gravity Grille 155mm External Dimension Ducting Air Vent with 100mm - 4 inch Round Rear Spigot and Not-Return Shutters - Kair Plastic Ducting Pipe 100mm - 350mm Short Length - Rigid Straight Duct Channel - Kair White Louvred Wall Vent Grille 155mm External Dimension with Flyscreen and Round 100mm - 4 inch Rear Spigot --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.th/products/48826074-kair-white-100mm-gravity-wall-vent-grille-99-5mm-4](https://www.desertcart.co.th/products/48826074-kair-white-100mm-gravity-wall-vent-grille-99-5mm-4) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-23*