This page sets out the technical specification of Round Single Deflection Air Vent Fresh Air Ceiling Grille 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 | Ø75mm, Ø100mm, Ø110mm, Ø125mm, Ø150mm, Ø160mm, Ø200mm, Ø250mm |
| Description | Circular single row louver air outlet, fixed straight slat design, spring buckle ceiling mounting, mainly used for air exhaust of fresh air and ventilation systems. |
| Material / Construction | High-quality ABS Plastic |
A circular single-row louvre air vent with fixed straight blades. Because the blades are fixed there are no moving parts to rattle or drift, which makes it the low-maintenance choice for exhaust and supply terminals in residential fresh air systems. The spring-buckle ring lets it snap into a ceiling opening without screws, and the ABS face wipes clean.
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 Round Single Deflection Air Vent Fresh Air Ceiling Grille 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 Round Single Deflection Air Vent Fresh Air Ceiling Grille 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.
Fits directly onto our aluminium flexible duct or HDPE corrugated pipe. Where adjustable airflow is needed instead, choose the round jet diffuser or the disc valve diffuser.
GUANDE manufactures Round Single Deflection Air Vent Fresh Air Ceiling Grille 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: Can the airflow be adjusted?
A: This model has a fixed louvre for constant-flow terminals. If you need regulation, order the adjustable jet or disc diffuser instead.
Q: Is a filter or insect screen available?
A: Yes. Please specify when ordering so the correct grille variant is supplied.
Q: What sizes do you stock?
A: We hold regular stock across the diameters listed in the specification table below.
The southeast corner of the private entrepreneurship park in Huadian Town, Qihui County, Dezhou City, Shandong Province