This page sets out the technical specification of Insulated ABS Flat Duct Elbow/Connector 132x40mm Dual-Channel Rubber-Foam Insulated Underfloor Ventilation Fitting with Aluminum Foil Cover for Fresh Air HVAC System OEM as supplied by GUANDE, together with the selection rules that determine which variant suits a given project. It is written for specifiers, estimators and contractors who need to confirm a size, a material build-up and a connection method without waiting on a quotation.
| Item | Specification |
|---|---|
| Available Sizes / Models | 132×40mm |
| Description | Insulated flat duct fitting (curved/elbow type) for underfloor fresh air supply system; dual-channel inner core; 5mm rubber-plastic foam insulation layer; aluminum foil outer wrapping; port with black sealing edge; |
| Material / Construction | Inner core: ABS; Insulation: rubber-plastic foam; Outer layer: aluminum foil |
An insulated flat duct elbow and connector for underfloor fresh air systems. The dual-channel ABS core is wrapped in 5 mm rubber-plastic foam insulation and finished with aluminium foil, so the insulated duct run continues unbroken through every change of direction. The port is finished with a black sealing edge.
Duct runs installed in a real building are never perfectly straight, and fittings have to absorb that. Products with a degree of angular tolerance and axial movement capability perform far better on site than rigid alternatives, because the connection itself is not required to act as a structural element. This matters most at the transition between a rigid plant connection and a flexible run, where thermal and vibration movement must be accommodated without opening a joint.
Different duct profile systems are not interchangeable, and an adapter between two systems is always a compromise. It adds a leak path, increases pressure loss and introduces a joint that may be the only one on the run without the benefit of the original sealing geometry. Standardising on a single profile family across a project is the simplest way to avoid the problem entirely. Where a transition is unavoidable, use a purpose-made adapter rather than forcing two incompatible components together.
Where a duct passes through a fire-rated compartment, the fitting used at that penetration is a fire-stopping component subject to building regulation. The correct approach depends on the rating of the wall or floor, the duct material and whether the duct is required to maintain the compartmentation itself. This is one of the few areas where a cost-driven substitution at purchase stage can create a compliance problem that is expensive to correct later. Confirm the requirement before ordering.
Quality inspection at GUANDE is not a final gate — it runs through the whole process. Incoming raw material is checked against specification before it enters production. In-process checks monitor dimensions and surface finish at defined intervals during the run. Finished Insulated ABS Flat Duct Elbow/Connector 132x40mm Dual-Channel Rubber-Foam Insulated Underfloor Ventilation Fitting with Aluminum Foil Cover for Fresh Air HVAC System OEM are inspected against the approved sample, and a batch record is kept against every shipment so that any issue can be traced back to its production parameters.
Our plant runs scheduled production for Insulated ABS Flat Duct Elbow/Connector 132x40mm Dual-Channel Rubber-Foam Insulated Underfloor Ventilation Fitting with Aluminum Foil Cover for Fresh Air HVAC System OEM with typical lead times of 15 to 25 days for standard items and 25 to 40 days for custom tooling projects. We load mixed containers directly at the factory, which lets us combine several product lines from your ventilation schedule into one shipment and reduce freight cost per unit. Confirmed lead times are stated on the order acknowledgement, not estimated at enquiry.
Use the following rules when converting a project drawing into an order. They reflect how the product performs in branch take-offs, direction changes and system terminations, where the practical limits are usually set by sealing quality, bend radius and connection tolerance rather than by the headline dimension.
Size the run from the design air flow and the acceptable pressure drop, not from the fan spigot. Undersizing a duct fittings run is the most common specification error and it cannot be corrected later without re-opening the ceiling.
Where the run passes through an unconditioned space, condensation risk — not mechanical strength — normally decides the specification. In those locations the insulated variant is the correct default and a bare equivalent is a false economy.
Keep one connector family for the whole run. Every change of system introduces an adapter, and every adapter is an additional leak path and pressure loss point.
Use with our insulated PVC TT flat duct, insulated rectangular duct, insulated small flat duct and the original insulated PVC flat duct 130x30mm.
GUANDE manufactures Insulated ABS Flat Duct Elbow/Connector 132x40mm Dual-Channel Rubber-Foam Insulated Underfloor Ventilation Fitting with Aluminum Foil Cover for Fresh Air HVAC System OEM at our factory in Dezhou, Shandong, China, and ships direct to HVAC contractors, distributors and project specifiers worldwide. Wholesale, OEM and ODM programmes are welcome. Items are supplied in export cartons with the size and quantity marked on the outer label. For OEM programmes we can apply your own artwork and labelling subject to a minimum order quantity.
The products below are routinely specified alongside the item discussed in this guide. GUANDE manufactures the full range in our own plant for consolidated shipping:
Q: Is it an elbow or a straight connector?
A: The fitting family includes both curved (elbow) and connector types; please confirm the exact configuration required when ordering.
Q: Does insulation continue through the fitting?
A: Yes, the fitting is insulated and foil-wrapped so the vapour barrier is continuous.
Q: What size is it?
A: 132 x 40 mm, as listed in the specification table.
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