SLXAD87 – 87º Elbow

Technical Specifications

Optimizing Exhaust Flow with the Solinox SLXAD87 87-Degree Chimney Elbow

In high-performance ventilation engineering, the efficiency of an exhaust system is dictated by its most restrictive points. Structural directional changes present a significant hydrodynamic challenge, often inducing turbulence and draft resistance. The Solinox SLXAD87 87-degree chimney elbow is engineered specifically to manage these directional transitions within double wall chimney systems without compromising thermal efficiency or exhaust velocity. For commercial, industrial, and high-end residential heating projects, this precision-fabricated component guarantees aerodynamic optimization and long-term structural integrity.

The Role of Sectional Geometry in Chimney Systems

Modern chimney systems rely on continuous, uninterrupted positive or negative pressure drafts to expel combustion byproducts safely. When an exhaust path must transition from a vertical plane to a horizontal breach—or navigate structural obstacles—the radius and angle of the configuration are critical.

An 87-degree offset, rather than a rigid 90-degree angle, provides a crucial 3-degree pitch. In double wall chimney configurations, this subtle slope ensures that any accumulated condensation drains back effectively toward designated collection points rather than pooling within the joint. Furthermore, the smooth internal geometry of the SLXAD87 minimizes boundary layer friction, preventing the draft loss commonly associated with standard segmented elbows.

Product Specifications and Material Integrity

The Solinox SLXAD87 is manufactured under strict quality management systems to withstand the harsh thermal and chemical environments characteristic of modern flue gases.

• Inner Wall Material: Premium high-grade stainless steel (AISI 316L / EN 1.4404), offering exceptional resistance against acid condensation and high temperatures.
• Outer Wall Material: Durable stainless steel (AISI 304 / EN 1.4301), providing structural rigidity and resistance to atmospheric corrosion.
• Insulation Core: High-density, bio-soluble rockwool insulation with a uniform thickness of 25mm or 50mm, maintaining outer skin safety temperatures and preventing thermal bridging.
• Joint Mechanism: Precision-engineered male-female connection profile secured with a wide locking band for gas-tight and moisture-resistant sealing.
• Operational Threshold: Continuous operating temperature capability up to 600°C under positive or negative pressure conditions.

The Solinox Advantage in Double Wall Chimney Design

Standard components often overlook the effects of thermal expansion. As flue gases cycle between ambient and peak operational temperatures, the inner liner of a double wall chimney expands linearly. The SLXAD87 elbow accounts for this thermodynamic stress through its advanced architectural coupling. The inner wall is permitted to expand independently of the outer protective casing, preventing structural deformation, seam splitting, or degradation of the insulating core.

Additionally, by eliminating metal-to-metal contact between the inner and outer layers at the joint intersections, the Solinox design mitigates thermal bridging. This ensures that the outer jacket remains cool to the touch while maximizing heat retention within the primary flue, keeping draft speeds optimal even in sub-zero external environments.

System Integration and Structural Engineering

The SLXAD87 is designed for seamless integration within complete double wall chimney systems. When planning an installation layout, mechanical engineers must calculate the total equivalent length added by fittings. The aerodynamic profile of this 87-degree elbow significantly reduces its equivalent pipe length value compared to standard multi-segment alternatives, allowing for more flexible routing without requiring an increase in the overall flue diameter.

Whether venting high-efficiency condensing boilers, biomass pellet systems, or industrial generators, utilizing the correct technical offset ensures compliance with European and international building performance regulations. It establishes a reliable, sustainable, and low-maintenance exhaust infrastructure.