This page sets out the technical specification of Quick Connect Acoustic Flexible Duct Transition Connector for HDPE Fresh Air Pipe & Air Outlet 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 | 75mm/110mm |
| Description | Sound-insulated flexible transition hose with quick-fit joints. Used as terminal connection between HDPE corrugated duct and air diffuser. Flexible bending layout, effectively reducing airflow noise, ideal for household fresh air ventilation end connection. |
| Material / Construction | Soundproof flexible hose + high-quality PP quick connection adapters |
An acoustic flexible transition connector used at the very end of an HDPE run, between the corrugated duct and the air diffuser. The sound-insulated hose decouples the rigid duct from the ceiling terminal, which breaks the path that fan noise would otherwise travel along. Its quick-fit joints make the final connection fast.
Terminals are frequently the loudest component in a ventilation system, and the reason is usually self-inflicted. Air forced through an undersized opening generates velocity noise that no amount of upstream attenuation will remove. The practical rule is that terminal velocity should be kept low enough that the terminal itself makes no contribution to the room noise level, and that the duct feeding it should be one nominal size larger than the terminal if the run is short. Designers who chase small face dimensions for aesthetic reasons usually pay for it in noise.
Where a supply terminal is placed matters as much as how it performs. A supply diffuser mounted directly above an extract grille short-circuits the air straight back out of the room without ever conditioning the occupied zone. A terminal placed in a corner will produce a completely different air pattern from the same unit placed centrally. Good practice is to position supply terminals to wash the occupied zone and to keep extract points on the opposite side of the room, ideally above humidity or odour sources.
Terminals are the visible face of the ventilation system, and they are judged on appearance as much as on performance. ABS and similar engineering polymers are the default choice because they hold their shape, resist discolouration and can be finished in a wide range of colours to match ceilings. Powder-coated steel is used where mechanical protection matters. For projects with specific interior requirements, colour matching and OEM branding are routinely available subject to minimum order quantities.
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 Quick Connect Acoustic Flexible Duct Transition Connector for HDPE Fresh Air Pipe & Air Outlet 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 Quick Connect Acoustic Flexible Duct Transition Connector for HDPE Fresh Air Pipe & Air Outlet 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 living rooms, bedrooms, kitchens, bathrooms and corridors, where the practical limits are usually set by effective open area, throw pattern and noise level 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 air terminals 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.
Designed for our HDPE fresh air corrugated pipe and round ceiling diffusers. Also see the complete terminal connection kit.
GUANDE manufactures Quick Connect Acoustic Flexible Duct Transition Connector for HDPE Fresh Air Pipe & Air Outlet 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: How much noise reduction does it give?
A: The acoustic hose reduces structure- and airborne noise transfer at the terminal. For higher attenuation, add a duct silencer further upstream.
Q: Which sizes are available?
A: The 75 mm and 110 mm versions are listed in the specification table below.
Q: Can it be fitted after the ceiling is closed?
A: It is normally installed at first fix before the ceiling is closed.
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