The Airwise AWMAV100S is a 100mm diameter metal supply air valve for mechanical ventilation duct systems. Manufactured from galvanised steel finished in RAL 9010 white, it provides the fresh air delivery terminal for MVHR whole-house heat recovery, positive-input ventilation (PIV), and mechanical supply ventilation systems operating with a 100mm distribution connection. The exverted (convex) adjustable central cone diffuses incoming supply air radially across the ceiling surface using the Coanda effect — delivering fresh air evenly without creating downdraught or cold spots at occupant level.
About Airwise: A leading UK and Ireland ventilation products supplier based in Tetbury, Gloucestershire — known for quality, integrity, and competitive pricing across the full spectrum of ventilation ducting, valves, and accessories.
Galvanised Steel
Construction
Exverted Cone
Radial Air Diffusion
MVHR / PIV
Compatible Systems
Supply Cone vs Extract Cone: The AWMAV100S has an exverted (convex) cone that pushes incoming air outward along the ceiling — spreading fresh supply air evenly into the room. The AWMAV100 extract valve has an inverted (concave) cone that draws air in. These are not interchangeable — always use the supply valve at fresh air delivery points and the extract valve at stale air collection points.
Commissioning: Set the cone position using a calibrated airflow meter or flow hood after the full system is connected and the MVHR or PIV unit is running. Verify that each room's supply rate meets the design specification and UK Building Regulations Part F minimum ventilation rates.
Key Features
Galvanised Steel Construction
Galvanised steel body provides long-term durability in ceiling installations across living rooms, bedrooms, and hallways — the typical supply terminal locations in MVHR whole-house systems.
RAL 9010 White Finish
Factory powder-coated in RAL 9010 pure white for a clean, unobtrusive ceiling finish that blends with standard domestic and commercial ceiling surfaces without requiring additional decoration.
Exverted Supply Cone
The convex central cone spreads incoming supply air radially outward along the ceiling surface, using the Coanda effect to distribute fresh air across the room without directing a cold jet of air onto occupants below.
Adjustable Flow Rate
Rotating the cone adjusts the annular supply gap, giving direct control over the fresh air delivery rate at each room terminal — the primary tool for balancing supply rates across multiple rooms during MVHR commissioning.
Low-Noise Supply Diffusion
The supply valve geometry is engineered for low turbulence and minimal airflow-generated noise at the terminal — essential for acoustic comfort in bedrooms and quiet living spaces served by continuous ventilation.
Ceiling or Wall Mounting
Suitable for ceiling or wall mounting, accommodating different duct routing layouts in both new-build MVHR installations and retrofit PIV system distribution runs.
Specifications
| SKU |
AWMAV100S |
| Brand |
Airwise |
| Diameter |
100 mm |
| Type |
Metal supply air valve |
| Body Material |
Galvanised steel |
| Finish |
RAL 9010 white powder coat |
| Cone Type |
Exverted (convex) — supply air diffusion |
| Cone Adjustment |
Rotary — adjustable by hand |
| Mounting |
Ceiling or wall |
| Typical Rooms |
Living room, bedroom, hallway, study — MVHR and PIV supply terminals |
| Compatible Systems |
MVHR, PIV, mechanical supply ventilation (100mm) |
Frequently Asked Questions
Why must I use a supply valve rather than an extract valve for fresh air?
The convex (exverted) cone of the supply valve is specifically shaped to spread incoming air across the ceiling using the Coanda effect, preventing cold downdraught at occupant level. The concave extract valve cone draws air inward — using it for supply would deliver a concentrated jet of air directly into the room, causing draughts and poor comfort.
Where in the room should I position the supply valve?
Install the supply valve in the ceiling of the habitable room, ideally near the centre or above the primary living/sleeping area. Avoid positioning directly above chairs, sofas, or beds — even diffused supply air can feel draughty at higher flow rates at very close range.
What is the typical supply rate for a bedroom at 100mm?
For a standard domestic bedroom, MVHR design typically specifies 12–25 litres per second (l/s) supply depending on room size and occupancy. A 100mm supply valve with appropriate system design comfortably handles this range. Verify with your MVHR commissioning data sheet.
Is the AWMAV100S suitable for bathrooms?
Supply valves are installed in habitable rooms only — living rooms, bedrooms, hallways, and studies. Bathrooms and WCs are extract-only points in MVHR systems. Do not install supply valves in wet rooms unless specifically required by your ventilation design.
Can I use this valve with rigid duct and flexible duct?
Yes — the 100mm spigot connection is compatible with both rigid PVC round duct and flexible duct connections of the same diameter. Secure flexible duct with a worm drive clip before fitting the valve.
