Ductable & Cassette – Shivay Engineers Private Limited

Q: What is the difference between a ducted unit and a cassette?

A ducted unit is concealed above the ceiling and distributes air through a ductwork system to multiple diffusers. A cassette unit is also ceiling-mounted but discharges air directly from its face in up to four directions without ductwork. Cassettes are simpler and less expensive; ducted units offer more flexibility in airflow distribution and filtration.

Q: How do you ensure even temperature across a large open-plan office?

We use CFD (computational fluid dynamics) software to model the airflow pattern from each diffuser, accounting for furniture layouts, heat gains, and thermal stratification. Diffuser type, throw, and velocity are adjusted to achieve <1°C variation across the occupied zone.

Home / Project / Ductable & Cassette Systems

03 — Ductable & Cassette Systems

DUCTABLE & CASSETTE
SYSTEMS

High-static ducted air conditioning and 4-way cassette units for retail, offices, restaurants, and hospitality. CFD-modelled for uniform comfort, noise below 28dB.

── What We Deliver

INVISIBLE HVAC,
PERFECT
COMFORT

Ductable and cassette systems deliver central air conditioning without the visual clutter of exposed equipment. We design around your ceiling architecture using CFD airflow modelling to ensure uniform temperature distribution, meet acoustic requirements, and integrate seamlessly with lighting and fire protection.

360^o

Airflow

<28dB

Noise Level

CFD

Modelled Design

── Key Features

WHAT WE DELIVER

Custom Ductwork Design

Sheet metal ductwork sized and balanced using ASHRAE duct design methods. CFD modelling for diffuser placement and throw pattern verification.

4-Way Cassette Units

Flush ceiling-mounted cassettes with 360° airflow pattern. Auto-swing louvres, condensate lift pumps, and wireless zone control.

High-Static Ducted Units

High-static concealed units for open-plan offices and retail spaces with long duct runs. Available with fresh air intake and optional HEPA filtration.

Acoustic Design

Flexible duct connections, acoustic lining, and attenuator sizing to achieve target NC/NR ratings for offices, meeting rooms, and hospitality spaces.

Zoned Comfort Control

Individual zone temperature control via wired or wireless thermostats, BMS integration, and occupancy-based setback for energy savings.

Architectural Coordination

We coordinate ceiling-level design with architects, interior designers, and structural engineers using Revit MEP BIM models to avoid clashes.

── Our Process

HOW WE WORK

01 Design & Sizing

Heat load calculation, unit selection, and ductwork layout coordinated with architectural drawings.

02 Procurement

Supply of high-static or cassette units, flexible ducts, diffusers, grilles, and control wiring.

03 Installation

Ceiling-level installation, ductwork, insulation, drain connections, and electrical terminations.

04 Balancing & Handover

Air volume balancing at every diffuser, noise measurement, zone control testing, and training.

── Brand Partners

BRANDS WE USE

Mitsubishi Electric

M-Series & City Multi

HiCool

Multi V Series

Carrier

Agio & AquaEdge

TOSHIBA

VRV IV Series

── FAQ

COMMON QUESTIONS

What is the difference between a ducted unit and a cassette?