A custom plenum fabrication for a discreet and well-balanced GREE ducted system in Lachine
In Lachine, our AirGreen team completed an HVAC installation that perfectly illustrates what a well-designed ducted system requires: precision, planning, and a real understanding of air behavior in a duct network. In the site photo, you can see a step often invisible to the end customer but essential to system performance: the preparation of a metal plenum with four circular outlets intended to supply different zones of the residence.
This project involved integrating a GREE All Match Slim Duct R32 ducted heat pump, an ideal solution for homeowners who want to enjoy heating and cooling without installing multiple visible wall units. The Slim Duct system, also called ducted conduit, ductable, or ducted heat pump, allows the indoor unit to be hidden in a ceiling, false ceiling, attic, or technical space, then distributes air through discreet grilles.
In a property in Lachine, where buildings can have very varied configurations — single-family homes, duplexes, triplexes, renovated condominiums, rear extensions, or partially open ceilings — a ducted installation requires on-site adaptation. Here, our work was not just to install a GREE machine. We also had to prepare a network capable of delivering a stable, quiet, and efficient airflow through multiple outlets without creating unnecessary losses.
The metal piece visible in the photo shows a clean, rigid, and aligned assembly: four circular connectors are installed on a rectangular box that will serve to distribute air to the ducts. This step is crucial. A poor plenum can cause uneven distribution, noise, turbulence, and reduced performance. At AirGreen, we pay special attention to the geometry of transitions, the strength of the connectors, airtightness, and compatibility with the unit's static pressure.
Why the GREE All Match Slim Duct R32 was suitable for this project
The GREE All Match Slim Duct R32 series is well suited for projects seeking an integrated, compact, and discreet solution. Unlike a wall-mounted heat pump, which blows directly into a room from a visible unit, a ducted system requires a more technical design. Air must be routed through a duct network, making sizing and balancing essential.
In this project in Lachine, the choice of a GREE ducted system met several specific objectives:
- preserve interior aesthetics by avoiding visible wall units;
- distribute air to multiple rooms from a single indoor unit;
- reduce temperature variations between served zones;
- maintain discreet acoustic operation;
- integrate the system into an existing structure without unnecessarily altering the architecture;
- prepare consistent access for future HVAC maintenance.
AirGreen offers several options for GREE ducted ducts, including low static pressure models, high static pressure models, and the All Match Slim Duct R32 range. The capacities available on our site include systems of 9,000, 12,000, 18,000, 24,000, 30,000, and 36,000 BTU depending on the configuration and building needs. For each project, the exact capacity must be confirmed based on the heat load, number of rooms, insulation, duct length, and available static pressure.
A solution designed for renovated houses in Lachine
Lachine has a diverse real estate portfolio. Some houses have been renovated in stages, others feature open ceilings in certain areas, accessible attics, or technical spaces that allow the integration of a ductable system. In these contexts, a ducted solution can become very interesting, but only if the project is well assessed before installation.
For this residence, the client was looking for more uniform comfort without adding several visible devices. This request is common among homeowners who want to modernize their heating and air conditioning without compromising interior design. A ducted heat pump meets this expectation well, as it keeps the walls clear and integrates air diffusion through discreet grilles.
The main challenge was in air distribution. Four outlets had to be carefully prepared to limit imbalances. When several ducts branch off from the same plenum, each branch must be designed to reduce pressure losses and maintain an acceptable flow rate. This is where field experience becomes essential.
Plenum fabrication: a detail that changes everything
The plenum is the heart of air distribution. It receives the air treated by the indoor unit and distributes it to the ducts. In the photo, the four circular metal connections are mounted on a rectangular box. This type of preparation must be done rigorously to avoid leaks and deformations.
A poorly designed plenum can create several problems:
- one room receiving too much air while another remains uncomfortable;
- excessive air noise at the grilles;
- too high static pressure;
- loss of energy efficiency;
- premature wear of the fan;
- difficulty balancing the network after startup.
In this project, we favored a clean, symmetrical, and easy-to-connect configuration. The metal collars were installed to receive the ducts without forcing the angles. The edges and joints were prepared to allow effective sealing once the network was finalized. This approach reduces the risk of air leaks, which is particularly important when the system passes through unconditioned areas.
Low static pressure or high static pressure: why this analysis is essential
A GREE ducted system can be offered in low or high static pressure depending on the ranges. This difference should never be ignored. Static pressure corresponds to the fan's ability to push air through the duct network despite the resistances created by lengths, bends, grilles, filters, and transitions.
For a short network with few outlets, a low-pressure solution may be sufficient. For a longer network, with several branches or architectural constraints, a high static pressure model may be required. Poor selection can greatly reduce comfort.
At AirGreen, we always analyze:
- the actual length of the ducts;
- the number of air outlets;
- the dimensions of the ducts;
- the bends and changes of direction;
- the location of the air return;
- losses caused by the grilles;
- the accessibility for installation;
- the desired noise level.
This step allows recommending a coherent GREE system, not just a randomly chosen BTU capacity.
The role of R32 in modern installations
The GREE All Match Slim Duct R32 range uses the refrigerant R32, found in several recent HVAC systems. For owners in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this type of technology fits a clear trend: more modern systems, better adapted to new performance requirements and residential comfort expectations.
However, the choice of refrigerant never replaces a good installation. Even an excellent system will lose efficiency if the ducts are poorly designed, if the connections leak, or if the unit is not properly sized. That is why our team places as much importance on the visible part as on the hidden part of the project.
A ducted HVAC installation where every connection influences the final comfort
One of the particularities of this project in Lachine was the need to prepare the distribution network before the full integration of the unit. This method allows us to control the quality of the components and validate the dimensions before the final connection.
A clean and methodical construction approach
In a ducted installation, the steps follow a precise order. We start by validating the location of the indoor unit, then we plan the ducts, outlets, air return, condensation drain, refrigerant lines, and electrical supply. Each decision impacts the final result.
In this project, the plenum was prepared on the floor to ensure better cutting and assembly accuracy. This way of working reduces improvised adjustments in tight spaces. Once assembled, the piece can be connected more efficiently to the system, with better control of angles and sealing.
The importance of sealing in a ducted system
In a Slim Duct installation, duct sealing is fundamental. An air leak in an attic, ceiling, or technical void can waste a significant part of the system's capacity. The client could then feel a lack of comfort, even if the machine itself is working properly.
To avoid this problem, we pay special attention to the following elements:
- mechanically fastening fittings;
- sealing joints;
- protecting transitions;
- insulating the ducts when necessary;
- reducing sharp bends;
- maintaining the effective diameter of the ducts;
- checking the air return.
These details are not always visible after the work, but they are essential to the durability and performance of the installation.
Common mistakes to avoid with ducted systems
Many owners compare systems by brand or price, but with a ducted heat pump, the quality of the installation matters as much as the equipment. A mistake in the network can reduce comfort for years.
The most common mistakes are:
- installing ducts that are too small;
- adding multiple elbows without recalculating losses;
- forgetting the importance of air return;
- choosing a capacity that is too high;
- neglecting access for maintenance;
- installing the grilles without considering the natural air flow;
- not balancing the outlets after startup.
In this project in Lachine, our preparation work was precisely aimed at avoiding these pitfalls. The four outlets visible on the plenum were designed as precise distribution points, not just random openings added by chance.
Acoustic comfort: an important advantage of a well-installed ducted system
A ducted system can be very discreet, but only if the network is well designed. Air noise often comes from too high a speed in the ducts, excessive pressure, or poorly made transitions. The choice of diameters, the quality of the fittings, and the placement of the grilles therefore play a major role.
With a GREE All Match Slim Duct R32, the goal is to maintain sufficient airflow while limiting turbulence. This allows for a pleasant temperature without creating a draft sensation or constant noise at the outlets.
For the client, the desired result is simple: feel comfortable without thinking about the machine. For us, this requires rigorous design.
Subsidies, efficiency, and eligibility by model
Some GREE models can be associated with certifications like Energy Star or subsidy programs depending on their exact features and current criteria. Ducted systems must always be checked model by model, as eligibility depends on capacity, certification, and the installed combination.
At AirGreen, we guide our clients in understanding the required documents after installation. We provide the necessary information about the installed equipment so the client can submit their file when the model is eligible. For owners in Lachine, as well as those in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this support reduces the risk of errors in the process.
Why AirGreen is well positioned for GREE ducted systems
AirGreen is a GREE Elite dealer and has solid experience with residential and multi-unit ducted projects. GREE ducted systems require more than a standard installation: you need to understand static pressure, airflow, return locations, the quality of connections, insulation, service access, and the complete building logic.
Our professional refrigeration technicians work with structured methods to ensure a durable installation. We also place great importance on transparency: before the work begins, we explain the constraints, options, and limits of the project. This clarity prevents surprises and allows the client to make an informed decision.
Our $5,000,000 liability insurance adds significant security for homeowners, condominium associations, and building managers who want to entrust their HVAC installation to a serious company.
Practical advice for Lachine homeowners considering a ducted system
Before choosing a ducted heat pump, it is first necessary to check if the building is suitable for this type of installation. Available space, duct passages, and the location of the air return are decisive. A ducted system is not simply a machine hidden in a ceiling: it is a complete network that must breathe properly.
It is also recommended not to compare only the price of bids. A less detailed proposal may hide a minimal duct network, an insufficient number of outlets, or a lack of attention to balancing. In the long term, these apparent savings can turn into discomfort.
A good project must include:
- an analysis of the interior configuration;
- a clear recommendation on capacity;
- a logical duct layout;
- an air return strategy;
- a condensation drainage method;
- access for maintenance;
- a static pressure check;
- a careful start-up.
A project that reflects AirGreen’s expertise in integrated HVAC
This installation in Lachine clearly demonstrates the value of precise work even before the system is fully visible. The metal plenum and its four outlets represent a technical step, but also a promise of comfort: every well-made connection contributes to better air distribution, improved efficiency, and a more pleasant experience for the client.
With the GREE All Match Slim Duct R32 systems, AirGreen offers a solution tailored to homeowners seeking discreet, efficient, and well-integrated comfort. Whether the project is in Montreal, Laval, Longueuil, on the North Shore, the South Shore, or directly in Lachine, our approach remains the same: to design a clean, durable installation truly suited to the building.