DuraVent | Type B Gas Vent 3"-8" Attic Insulation Shield

Save $29.35
DuraVentSKU: 3GVIS

Regular price$117.41 Sale price$146.76
Flash Sale is ON! Free Shipping & Returns on All Orders. Get 15% off with the Code: FLASH15 for purchase over $199 and 19% off with the Code: FLASH19 for purchase over $8999. Best Deal Ever! Need Help? Call 800-466-4712 or mail us at sales@belleflame.com
Size: 3" - 4"
⛟ Estimated Delivery Date: Between and to all states excl. Alaska & Hawaii.


When it comes to your home's safety and efficiency, DuraVent stands as the undisputed leader in the venting industry. Our commitment to innovation and quality is exemplified in the DuraLock Gas Vent Attic Insulation Shield, an essential addition to any gas venting system. With DuraVent, you're not just buying a product; you're investing in peace of mind.


  1. Enhanced Safety: Prevent insulation and debris from gathering near your venting system, reducing the risk of hazards.
  2. Optimized Efficiency: Maintain consistent heating operation with minimal condensation in your appliance and vent system.
  3. Versatile Sizing: Available in various diameters, from 3" to 8", ensuring compatibility with a wide range of installations.
  4. Easy Installation: Featuring twist-lock fittings for diameters from 3" to 16", installation is a breeze.
  5. Durable Build: Crafted with precision using aluminum inner walls and galvanized outer walls, ensuring longevity.

Key Features:

  1. Attic Insulation Protection: Safeguard your venting system from insulation and debris accumulation.
  2. Aluminum Construction: Inner walls built with high-quality aluminum for durability and efficiency.
  3. Galvanized Outer Wall: Provides additional protection and longevity to your gas vent.
  4. Twist-Lock Fittings: Secure and easy-to-install fittings for diameters from 3" to 16".
  5. Versatile Sizing: Available in a range of diameters to suit your specific needs.


DuraVent's DuraLock Gas Vent Attic Insulation Shield is your trusted solution for a variety of applications:

  • Natural Gas Fireplaces: Ensure safety and efficiency in your fireplace setup.
  • Gas-Fired Furnaces: Keep your furnace running smoothly and worry-free.
  • Boilers: Enhance boiler performance while maintaining safety.
  • Water Heaters: Enjoy hot water without compromising on safety.
  • Space Heating: Stay warm and cozy with confidence.


Model Size Dimension
3GVIS 3"-4" Inner Diameter 6.75" (A) x 7.1875" (B) x 9.25" (C)
5GVIS 5"-6" Inner Diameter 8.75" (A) x 8.9375 (B) x 11" (C)
7GVIS 7"-8" Inner Diameter 10.75" (A) x 10.3125" (B) x 13" (C)
Adjust From 11" - 20" Height
Clearances 1" to combustibles in single and multi-family dwellings
Listings UL Listed to UL 441 and UL 1777(MH6357), ULC listed to ULC S605 (CMH1276 & CMH1407).
Warranty Limited-lifetime warranty


About the Manufacturer

Consistently the first to market with new innovations in venting systems, DuraVent has captured a leadership position in emerging markets. DuraVent has patents for several products and continues to design safe and technologically advanced venting.The company’s research into solving problems with corrosion, when biofuels such as corn are used, led to the break-through patent for PelletVent Pro.

Order Confirmation:

Upon placing your order, you will promptly receive an email confirmation. Subsequently, we will conduct a thorough inventory check to ensure all items are in stock and available for immediate shipment. If your order aligns with the advertised delivery timeframe, we will promptly process it for shipment to our warehouse. In cases where the expected delivery time extends beyond the advertised timeframe, we will reach out to you via email and/or phone for confirmation.

Order Shipment:

Within one business day of your item being shipped, you will receive an email confirmation containing a tracking number. If you do not receive tracking information within six business days of placing your order, please don't hesitate to get in touch with us for assistance.

Estimated Time of Arrival:

Our typical delivery timeframe ranges from 2 to 10 business days. Custom-made products generally require 3 to 5 weeks for delivery. If the expected delivery date for your order would fall outside of the advertised 2-10 business day time frame, our customer service team will contact you to ensure your agreement with the revised timeline.

Covered Areas:

Please note that all estimated delivery dates and shipping costs advertised on our website apply exclusively to the Contiguous United States. For inquiries regarding shipping to Hawaii or Alaska, kindly reach out to our customer service team. While we do not offer direct shipping to Canada, we are more than willing to ship your order to the freight carrier of your choice.


It is very important that you inspect the packaging of your items when they arrive and check if you received all boxes listed on the delivery receipt. If you notice any damage or shortage of packages, you must make note of it on the bill of lading, take pictures, and refuse delivery. Your note should say "refused due to damage". You must also take photos of all sides of the box and send them to us within 2 days. If there are no damages visible before opening the box, you must note "subject to further inspection may contain concealed damage". If you notice any damage after receiving the delivery, do not throw the box away, and contact us with the photos. After we receive information from you about the refused delivery or concealed damage, we immediately initiate a claim with the shipping company or with the manufacturer. After the claim is fully processed, we ship all replacements at absolutely no cost to you.

Cancellations & Refunds:

We offer free order cancellations before the shipping label or Bill of Lading is generated, or prior to the commencement of production for custom orders. Please note that custom-made items are not eligible for refunds once production has begun. To be eligible for a return, the item must be unused and in its original condition, with all packaging intact and in perfect condition. Orders delivered outside of the United States are not eligible for refunds. If your order arrives damaged, please refer to the "Damages" section. Our refund policy extends for 30 days. If 30 days have elapsed since your purchase, regrettably, we cannot process a refund. Prior to returning an item, please contact us to discuss shipping details. All refunds will be credited to the original credit card or PayPal account used for the purchase, within two days of receiving the returned items at our warehouse.

Please contact sales@belleflame.com for any questions regarding shipping time.

At Belleflame, we're committed to providing our customers with the best prices on the market. That's why we offer a 110% best price guarantee. If you find a better deal on the same product somewhere else, just let us know and we'll beat it by an additional 10%.

We believe that shopping should be easy, convenient, and most importantly, affordable. That's why we work hard to bring you the lowest prices on the products you love. But if you do happen to find a better deal elsewhere, we'll go the extra mile to make sure you get the best deal possible.

Here's how it works:

  • Find a lower price on the same product from another retailer.
  • Contact us with the details of the offer, including the website or store name, product name, and price.
  • We'll verify the price and beat it by an additional 10%.

It's that simple! Our 110% best price guarantee ensures that you'll always get the best deal possible when you shop with us. So, why wait? Start shopping now and experience the difference of shopping with Belleflame.

At Belleflame, we believe that shopping should be simple, stress-free, and most importantly, enjoyable. That's why we work hard to bring you the best products, prices, and customer service in the industry.

Here are just a few reasons why you should choose us:

  • Wide Selection of Products: We offer a vast selection of top-quality products from the leading brands in the industry. No matter what you're looking for, we have something for everyone.
  • No Sales Tax, no Hidden Fees: just the lowest prices on the market. When you shop with us, you can rest assured that the price you see is the price you'll pay. No matter where you live, you can enjoy tax-free shopping with us.
  • Fast and Free Shipping: We understand that you want your products as soon as possible. That's why we offer fast and free shipping on all orders.
  • Easy Returns: We want you to be completely satisfied with your purchase. If for any reason you're not happy, just let us know and we'll make it right.

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