Verplas 150mm White Metal Adjustable Supply Air Valve

Description

The Verplas MW155 is a 150mm diameter white powder-coated steel adjustable supply air valve for mechanical ventilation systems. Designed for ceiling or wall installation, it provides a controlled, adjustable supply air outlet that can be balanced to achieve the correct flow rate at each supply point. The valve is manufactured from white epoxy powder-coated steel, with an adjustable inner core for on-site flow setting, and a male spigot for direct connection to the 150mm System 150 duct.

150mm

Spigot Diameter

Steel

Powder-Coated White

Adjustable

Flow Setting

Supply

Air Function

Ceiling/Wall

Mounting

Supply vs Extract: The MW155 is a supply air valve — for use on incoming air distribution points. The equivalent MW154 is the extract air valve for removing stale air. Both use the same 150mm System 150 spigot connection.

Key Features

White Epoxy Powder-Coated Steel

Manufactured from robust steel with a white powder-coat finish, providing durability and a clean aesthetic suited to both domestic and commercial interiors.

Adjustable Inner Core

The adjustable central disc allows airflow to be set precisely on site — essential for balancing multi-room ventilation systems to design flow rates.

150mm Male Spigot

The male spigot connects directly inside the System 150 duct socket — no adaptor or additional fitting required for standard installations.

Ceiling or Wall Installation

Suitable for horizontal ceiling mounting or vertical wall mounting depending on the system layout and room configuration.

MVHR & dMEV Supply Outlets

Designed for use as a terminal supply point in MVHR, positive input ventilation (PIV), or mechanical supply systems in domestic and light commercial settings.

Matched to MW154 Extract Valve

Use alongside the MW154 extract valve for a consistent appearance across supply and extract terminals in the same installation.

Specifications

Verplas SKU	MW155
Function	Supply Air Valve
Diameter	150 mm
Material	White epoxy powder-coated steel
Inner Disc	Adjustable for flow setting
Mounting	Ceiling or wall
Spigot	150mm male — connects to System 150 duct socket
Matching Extract SKU	MW154

Frequently Asked Questions

How do I adjust the airflow on this valve?

The inner disc is rotated to narrow or widen the opening, increasing or reducing flow. Use an anemometer or flow hood at commissioning to set each valve to its design flow rate.

Can I use this valve on an extract duct?

No — the MW155 is specifically designed as a supply valve. For extract, use the Verplas MW154, which has the same form factor optimised for exhaust airflow.

Does this valve need a back-draught damper?

In MVHR systems, the unit itself provides back-draught prevention. For single-fan supply systems, consider adding a damper at the fan or duct connector if required by the system design.

What finish is the valve?

White epoxy powder-coated steel (equivalent to RAL 9010 white). The finish is durable for indoor use.

Is this valve suitable for a bathroom supply?

Bathrooms typically use extract valves. Supply valves are more commonly used in living rooms, bedrooms, or hallways as part of a balanced whole-house ventilation system.

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Room Dimensions

Length (in m):

Width (in m):

Height (in m):

Room Type

Living Room

Bedroom

Kitchen

Bathroom

Conservatory

Hallway

Glazing Type

Single Glazed

Double Glazed

Triple Glazed

External Walls

0 Wall

1 Wall

2 Walls

3 Walls

4 Walls

Insulation Level

Poor

Average

Good (New Build)

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