Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 13 - Jul 18
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Description
Storm Collar 4" Twinwall BlackInner Diameter 100mm, external diameter 160mm. Our superior stainless steel insulated twinwall flue system for use with solid fuel appliances. Dinak has the strongest interlocking joint system on the market today, making it popular with top installers who need to rely on a quality system every time. Select your required parts and add to your cart, or alternatively Use our FREE TWINWALL QUOTATION SERVICE! and we will select all of the required parts to
Inner Diameter 100mm, external diameter 160mm.Our superior stainless steel insulated twinwall flue system for use with solid fuel appliances. Dinak has the strongest interlocking joint system on the market today, making it popular with top installers who need to rely on a quality system every time.
Select your required parts and add to your cart, or alternatively Use our FREE TWINWALL QUOTATION SERVICE! and we will select all of the required parts to suit your system.
Note: a locking band is required at each joint in the twinwall system.
Main Features
• Simple, easy push-fit system
• HETAS Approved
• High mechanical resistance to vertical and horizontal forces
• 60mm clearance to combustibles
• No thermal bridge, insulation continuity throughout the system
• Thermal expansion absorbed in each element
• High working temperature: 600°C under continuous operation
Applications
• Solid fuel appliances, wood and multifuel stoves
• Biomass boilers
• Domestic heating and hot water systems
• Hot air generators
• Bakery ovens
• Ventilation and smoke extraction
• Industrial / commercial heating
Materials
Inner wall: 316L Stainless Steel
Outer wall: 304 Stainless Steel
Insulation: 30mm Rockwool
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 1614 reviews
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Product Reviews
★★★★★ 5
Tanks
Size: XX-Large, Color: Light Grey
Light and breathable cotton, nice straight cut, best price out there for tanks. Seems like very good quality for super discount price. I’ll buy more
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Reviewed in the United States on March 15, 2026
★★★★★ 5
Nice good
Size: Large, Color: White
Nice material.
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Reviewed in the United States on April 9, 2026
★★★★★ 5
Primo!!!
Size: XX-Large, Color: Black
The fit was right, the style was sexy and I exuded that same mentality while wearing it! I'm 230lbs 6'2" and I have the 2XL. This top is perfect for cooler weather not too heavy not too light it appears to be just right. I love the quality.
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Reviewed in the United States on December 9, 2025
★★★★★ 5
Good looking shirt
Size: X-Large, Color: Brown
I like it. Nice material, it's warm, and it looks good. The shoulders are a little broad but that's what I get for having narrow shoulders.
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Reviewed in the United States on February 21, 2026
★★★★★ 5
Great fit, good golf sweater
Great fit, nice for chilly mornings on the golf course
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Reviewed in the United States on March 13, 2026