Air Diffusers - Refrigeration and HVAC

Marine air diffusers distribute conditioned supply air or extract air throughout vessel accommodation, control rooms, public spaces and machinery areas. They are selected for airflow pattern, noise level, corrosion resistance, fire-rating requirements and compatibility with the shipboard HVAC system.

ProShipWorks provides end-to-end support to source and supply Air Diffusers for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.

Last updated: October 11, 2026

Product Information

Product Name	Air Diffusers
Product Category	Refrigeration and HVAC
Product Reference	1444
Brands / Manufacturers	TROX, Halton, Lindab
Unit of Measure	Piece

Key Features

Key Feature
1. Ceiling, wall or exposed-duct installation
2. Adjustable blades or fixed directional airflow pattern
3. Marine-grade aluminum, stainless steel or coated steel construction
4. Low-noise air distribution for accommodation spaces
5. Removable faceplate for inspection and cleaning

Applications of Air Diffusers

Application
1. Cabins, corridors and accommodation areas
2. Wheelhouses, control rooms and offices
3. Engine rooms, workshops and technical spaces

Models & Manufacturers

Model	Manufacturer
DLQ	TROX
VDW	TROX
ADLQ	TROX

Technical Specifications

Model	Specification	Value	Unit
DLQ	Diffuser type	Square ceiling air diffuser	—
VDW	Diffuser type	Circular swirl diffuser	—
ADLQ	Diffuser type	Square ceiling air diffuser with adjustable air pattern	—
Marine HVAC diffuser	Typical construction	Marine-grade aluminum, stainless steel or protective-coated steel	—
Marine HVAC diffuser	Selection parameters	Airflow, throw, pressure drop, sound power level and room occupancy	—

Standards, Certifications & Class Approval

Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.

Applicable Standards & Certification	Selection and testing may reference ISO 7547 for shipboard accommodation air-conditioning and ventilation, EN 12238 for air terminal devices, and applicable IMO fire-safety requirements. Exact certification depends on material, fire rating and project specification.
Class Approval	Classification approval is normally project- and installation-specific. DNV, ABS, Lloyd's Register, Bureau Veritas and ClassNK may accept marine HVAC diffusers when supplied within an approved ventilation system and supported by required fire, material and performance documentation.

Installation, Maintenance & Safety Information

Installation Notes	Install square, level and securely connected to the correctly sized duct or plenum. Seal duct connections, maintain access for faceplate removal, and balance the system after installation. Use approved corrosion-resistant fasteners and materials suitable for the vessel environment.
Maintenance Tips	Inspect periodically for corrosion, loose fasteners, damaged finishes and blocked openings. Clean the faceplate and blades with a non-abrasive cleaner. Verify airflow balance and repair damaged protective coatings.
Safety Notes	Isolate and lock out the HVAC fan before removal or cleaning. Do not obstruct the diffuser or alter blade settings without checking system balance. Confirm fire, smoke and hazardous-area requirements before replacing diffusers in protected or machinery spaces.