Anti-ligature Ventilation Plenum is a secure air distribution unit for mental health environments, connecting circular ductwork to IP3X-rated anti-ligature grilles. Made from 1.5mm Zintec steel, it supports infection control with BioCote® antimicrobial finish. Available in grille sizes 200×200mm, 300×300mm, and 450×450mm, each with matching plenum and spigot dimensions.

  • Secure ventilation plenum for mental health and high-risk settings

  • IP3X-rated punched steel grille with 2mm holes at 4mm centres

  • Removable access door for cleaning and maintenance

  • Flush ceiling installation with no exposed fixings

  • Pin Torx anti-ligature fixings and internal threaded inserts

  • BioCote® antimicrobial powder coating as standard

  • Supports both supply and extract ventilation

Applications

  • Acute adult inpatient wards

  • PICU and high-dependency mental health settings

  • CAMHS inpatient units

  • Rehabilitation and step-down wards

  • Seclusion, low-stimulus, and en-suite bathroom areas

  • Any area where standard ventilation grilles present a ligature or tamper risk

Dimensions

Grille size 200×200mm

Plenum 250×250×250mm

Spigot Ø125mm

Grille size 300×300mm

Plenum 350×350×300mm

Spigot Ø160mm

Grille size 450×450mm

Plenum 520×520×400mm

Spigot Ø200mm

Materials

Made from 1.5mm Zintec steel

Magnelis steel for wet areas

Finish

Powder coated inside and out

BioCote® antimicrobial agent in finish

Colours

RAL 9003 white

Performance

IP3X-rated grille

Pressure drop at 80L/s: 10Pa supply, 26.4Pa extract (300×300mm grille)

Installation

Flush with ceiling

All fixings internal

Top-entry circular spigot

Maintenance

Removable access door for cleaning and inspection

Designed for HBN 03-01 Environments

Getting ventilation right in a secure mental health ward is more complex than it looks. Every element of the built environment comes under scrutiny, from CQC inspections and clinical sign-off through to infection prevention reviews and long-term maintenance access.

A key benefit is the removable access door, which allows estates and maintenance teams to clean inside the plenum and access the connected ductwork more easily. This helps support routine cleaning, inspection, and infection control procedures, without compromising the secure, anti-ligature design of the installation.