← All applicationsApplication · Fresh air

Renew the air only when needed.

Indoor air quality controlled by real demand. Networked sensors adjust ventilation automatically to occupancy.

Talk about this project →See how it works ↓

Cross-section of a building with three rooms: fan at the outdoor air intake, ducts with diffusers, STG MINI sensors in the rooms and an STG QAI on the wall of the last one — A fan with an STG DRV at the outdoor air intake; STG MINI in the rooms and STG QAI in the last one. Fresh air reaches the diffusers only when the reading calls for it.

MeasuresCO₂, temperature and humiditySTG MINI or STG QAI in each room

CommandsThe fanon/off through the relay or proportional through 0–10 V

DecidesThe highest demandworst case, average or zones, by the configured rule

MonitorsWeb interfacecomputer and phone, over the STG wireless network

How it works

Three ways to build it, the same network.

Ventilating all the time wastes energy; ventilating too little compromises air quality. Demand-controlled ventilation modulates airflow exactly when and as much as the room needs.

Mode 01

Air monitoring only

The STG MINI measures CO₂, temperature and humidity in the room and shows the readings on the web interface, on a computer or phone, over the STG wireless network. Nothing is driven: it is the diagnosis stage, or all you need when you only want to know how the air is.

STG wireless network

Storge web interface on a computer — **Web interface**computer and phone

Storge web interface on a phone — **Web interface**computer and phone

Mode 02

Air monitoring and control

The MINI sits in the room; the STG DRV sits next to the fan and executes the command that arrives over the STG wireless network: on/off through the relay or speed through the 0–10 V output. No signal cable between the two.

The STG DRV commands single-phase AC or EC fans. Several MINIs can command the same DRV through the configured rule.

STG wireless network

**STG DRV**at the fan(AC via relay · EC via 0–10 V)

→ One of these units

Wave fan

Ventilation box

AFSW EC axial exhaust fan

Jet fan

One unit per DRV, as the project defines.

Mode 03

All in one device

The STG QAI measures, shows and drives in the same device: relay for on/off and 0–10 V output for proportional command of a compatible fan or damper. It is the setup for the small room, with no intermediate controller.

relay
0–10 V

4.3" display and web interface
10 A relay and 0–10 V output
BMS integration over Modbus RS-485
STG wireless network
Built-in reports

Several rooms, one fan

The highest demand sets the response.

Each room measures its own air and reports over the STG network. One rule decides: worst case, average, zones or custom logic. The STG DRV then adjusts the fan.

Room 1Room 2Room 3

STG wireless networkSTG DRVFan

01 · MeasurementSensors in each roomSensors measure CO₂, temperature and humidity (VOCs depending on the package) in the rooms.
02 · CommandOn/off or proportionalVentilation is commanded on/off or proportionally, locally by the QAI or remotely by a DRV that receives the command over the STG network.
03 · CoordinationOne rule decidesWith several rooms, the configured rule (worst case, average or zones) decides the fan response.

What the system delivers

Fresh air as needed, no ventilating for nothing.

Ventilates by what the room asks forSensors measure CO₂, temperature and humidity; ventilation goes up and down with real occupancy, instead of running all the time.
No signal cableSensor in the room, DRV next to the fan, command over the STG wireless network. In a small room, the QAI does it all in one device.
Supervision and integrationNative web interface, no app, and BMS integration over Modbus RS-485. Fresh air within what NBR 16401 and ASHRAE 62.1 require.

Features

What comes with the system.

Automatic ventilation adjustment to real occupancy
Motorised damper control
Native web interface, no app needed
Modbus RTU RS-485 for BMS integration
Compatible with EC motors and frequency drives
Filter saturation alarms (with CPD or AHU)

Corporate offices
Hospitals and clinics
Schools and auditoriums
Laboratories

Components

Who does what.

Catalogue →

STG MINI

CO₂, temperature and humidity measurement in each room.

Depends on the projectSee product →

STG QAI

Measurement with display and local actuation: relay and 0–10 V output in the device itself.

Depends on the projectSee product →

STG DRV

AC or EC fan drive, next to the equipment, over the STG network.

Depends on the projectSee product →

STG AHU

When the AHU takes part: the set modulates airflow from the readings.

OptionalSee product →

STG CPD

Constant airflow by K-factor in the ventilation box and filter status.

OptionalSee product →

Supply

What Storge delivers and what it needs to know.

Delivery: STG sensors and drives in the chosen architecture. Panel or AHU set when the AHU takes part.
To quote: Rooms and occupancy · existing ventilation equipment · whether there is an AHU and a BMS.
Limit: Fans and dampers must be compatible with the chosen command: relay, 0–10 V or frequency drive.
Standards: NBR 16401 and ASHRAE 62.1.

Talk to engineering →Request documentation

Frequently asked questions

Before quoting, what people ask.

Quote

Tell us the rooms. Storge sizes the system.

You send the basic room data through the form or on WhatsApp. Engineering checks the configuration and returns the proposal.

01 · Reply on WhatsAppDuring business hours, Monday to Friday, 8 am to 6 pm (BRT).
02 · Room dataRooms and occupancy, existing or planned fans, AHU and BMS.
03 · Sized proposalSensors, drives and ventilation rule, with scope and investment.

Prefer to send the room data in writing?

Demand-controlled ventilation in your project?

Receive a proposal sized for your project, within what NBR 16401 requires.

WhatsApp →41 3056 3431